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学者姓名:任晓兵

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Preface Scopus
期刊论文 | 2018 , 275 , v-vii | Springer Series in Materials Science
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GB/T 7714 Lookman, Turab , Ren, Xiaobing . Preface [J]. | Springer Series in Materials Science , 2018 , 275 : v-vii .
MLA Lookman, Turab 等. "Preface" . | Springer Series in Materials Science 275 (2018) : v-vii .
APA Lookman, Turab , Ren, Xiaobing . Preface . | Springer Series in Materials Science , 2018 , 275 , v-vii .
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Amorphous martensite in beta-Ti alloys SCIE PubMed Scopus
期刊论文 | 2018 , 9 | NATURE COMMUNICATIONS
WoS CC Cited Count: 2 SCOPUS Cited Count: 5
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Martensitic transformations originate from a rigidity instability, which causes a crystal to change its lattice in a displacive manner. Here, we report that the martensitic transformation on cooling in Ti-Zr-Cu-Fe alloys yields an amorphous phase instead. Metastable beta-Ti partially transforms into an intragranular amorphous phase due to local lattice shear and distortion. The lenticular amorphous plates, which very much resemble alpha'/alpha ''. martensite in conventional Ti alloys, have a well-defined orientation relationship with the surrounding beta-Ti crystal. The present solid-state amorphization process is reversible, largely cooling rate independent and constitutes a rare case of congruent inverse melting. The observed combination of elastic softening and local lattice shear, thus, is the unifying mechanism underlying both martensitic transformations and catastrophic (inverse) melting. Not only do we reveal an alternative mechanism for solid-state amorphization but also establish an explicit experimental link between martensitic transformations and catastrophic melting.

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GB/T 7714 Zhang, Long , Zhang, Haifeng , Ren, Xiaobing et al. Amorphous martensite in beta-Ti alloys [J]. | NATURE COMMUNICATIONS , 2018 , 9 .
MLA Zhang, Long et al. "Amorphous martensite in beta-Ti alloys" . | NATURE COMMUNICATIONS 9 (2018) .
APA Zhang, Long , Zhang, Haifeng , Ren, Xiaobing , Eckert, Juergen , Wang, Yandong , Zhu, Zhengwang et al. Amorphous martensite in beta-Ti alloys . | NATURE COMMUNICATIONS , 2018 , 9 .
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Designing High Dielectric Permittivity Material in Barium Titanate EI SCIE Scopus
期刊论文 | 2017 , 121 (24) , 13106-13113 | JOURNAL OF PHYSICAL CHEMISTRY C | IF: 4.484
WoS CC Cited Count: 14 SCOPUS Cited Count: 14
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Developing high dielectric permittivity material is vital to satisfy the ongoing demands for the miniaturization of electronic and energy storage devices. Recent investigations uncover the role of a thermodynamical tricritical phenomenon on enhancing the dielectric response. However, such a tricritical point always locates in an extremely narrow composition region, which makes it time-consuming for exhaustive experimental searching of the optimal dielectric permittivity in a given material system. In the present paper, we employ an accelerated discovery strategy to seek the largest dielectric permittivity in Ba(Ti1-x%Hfx%)O-3 ceramic material by using an iterative method between computational machine learning and the experimental synthesis and property measurement. The optimal composition is found to be x = 11 with the highest permittivity of epsilon(r) = 4.5 x 10(4) after 4 loops of iteration involving 6 compositions, which shows higher efficiency compared with conventional experimental searching. Further thermal analysis study suggests that such a permittivity-maximum location on the phase diagram is indeed a tricritical point. Moreover, the microstructure investigation by TEM observation indicates that the tricritical point shows a mottled morphology consisting of numerous nanodomains with multiple phases coexisting, and a phenomenological thermodynamic model based on the experimental result implies that the tricriticality is responsible for the enhanced dielectric permittivity.

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GB/T 7714 Gao, Jinghui , Liu, Yongbin , Wang, Yan et al. Designing High Dielectric Permittivity Material in Barium Titanate [J]. | JOURNAL OF PHYSICAL CHEMISTRY C , 2017 , 121 (24) : 13106-13113 .
MLA Gao, Jinghui et al. "Designing High Dielectric Permittivity Material in Barium Titanate" . | JOURNAL OF PHYSICAL CHEMISTRY C 121 . 24 (2017) : 13106-13113 .
APA Gao, Jinghui , Liu, Yongbin , Wang, Yan , Hu, Xinghao , Yan, Wenbo , Ke, Xiaoqin et al. Designing High Dielectric Permittivity Material in Barium Titanate . | JOURNAL OF PHYSICAL CHEMISTRY C , 2017 , 121 (24) , 13106-13113 .
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High damping capacity of a Ni-Cu-Mn-Ga alloy in wide ambient-temperature range EI SCIE Scopus
期刊论文 | 2017 , 695 , 2400-2405 | JOURNAL OF ALLOYS AND COMPOUNDS | IF: 3.779
WoS CC Cited Count: 7 SCOPUS Cited Count: 8
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The damping capacity of Ni55-xCuxMn25Ga20 (x = 0, 2, 4, 6) shape memory alloys is studied in details. The results show an increasing damping peak capacity with increasing Cu content. Especially, a high damping peak with the peak value of 0.08 is found in Ni49Cu6Mn25Ga20 alloy, which spans over a wide temperature range of 173 K-425 K. The first-principles calculations indicate the substitution of Cu for Ni weakens the p-d orbital hybridization of Ni55-xCuxMn25Ga20 and reduces its martensite modulus, which thus enhances its twin boundary mobility and the damping capability. Our study sheds light on developing ambient-temperature high damping alloys. (C) 2016 Elsevier B.V. All rights reserved.

Keyword :

Martensitic phase transformation Dynamic mechanical analysis Ferromagnetic shape memory alloy Magnetic properties Damping

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GB/T 7714 Liao, Xiaoqi , Wang, Yu , Fan, Genlian et al. High damping capacity of a Ni-Cu-Mn-Ga alloy in wide ambient-temperature range [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 695 : 2400-2405 .
MLA Liao, Xiaoqi et al. "High damping capacity of a Ni-Cu-Mn-Ga alloy in wide ambient-temperature range" . | JOURNAL OF ALLOYS AND COMPOUNDS 695 (2017) : 2400-2405 .
APA Liao, Xiaoqi , Wang, Yu , Fan, Genlian , Liu, Enke , Shang, Jiaruo , Yang, Sen et al. High damping capacity of a Ni-Cu-Mn-Ga alloy in wide ambient-temperature range . | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 695 , 2400-2405 .
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Ferroelectric Domain Walls Approaching Morphotropic Phase Boundary EI SCIE Scopus
期刊论文 | 2017 , 121 (4) , 2243-2250 | JOURNAL OF PHYSICAL CHEMISTRY C | IF: 4.484
WoS CC Cited Count: 11 SCOPUS Cited Count: 11
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Domain walls play an important role in tailoring the properties of ferroic materials. We employ a Landau-Ginzburg thermodynamic model to investigate the ferroelectric domain walls around the morphotropic phase boundary (MPB) which contribute to the large piezoelectric response, including 90 degrees domain wall for tetragonal (T) symmetry and 109 degrees and 71 degrees domain walls for rhombohedral (R) symmetry. The domain wall energy for each type of domain wall has been analytically calculated by quasi-one-dimensional solution of the spatial evolution for polarization. Our results suggest that the domain wall energies for both T-T and R-R domains decrease as the composition approaches MPB accompanied by the vanishing of polarization anisotropy, which can be-viewed as the origin for the experimentally observed miniaturized domains. In addition, the reduced domain wall energy caused by the polarization anisotropy vanishing is responsible for the large piezoelectric response due to the displacement of domain walls.

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GB/T 7714 Gao, Jinghui , Hu, Xinghao , Liu, Yongbin et al. Ferroelectric Domain Walls Approaching Morphotropic Phase Boundary [J]. | JOURNAL OF PHYSICAL CHEMISTRY C , 2017 , 121 (4) : 2243-2250 .
MLA Gao, Jinghui et al. "Ferroelectric Domain Walls Approaching Morphotropic Phase Boundary" . | JOURNAL OF PHYSICAL CHEMISTRY C 121 . 4 (2017) : 2243-2250 .
APA Gao, Jinghui , Hu, Xinghao , Liu, Yongbin , Wang, Yan , Ke, Xiaoqin , Wang, Dong et al. Ferroelectric Domain Walls Approaching Morphotropic Phase Boundary . | JOURNAL OF PHYSICAL CHEMISTRY C , 2017 , 121 (4) , 2243-2250 .
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High temperature-stability of (Pb0.9La0.1)(Zr0.65Ti0.35)O-3 ceramic for energy-storage applications at finite electric field strength EI SCIE Scopus
期刊论文 | 2017 , 137 , 114-118 | SCRIPTA MATERIALIA | IF: 4.163
WoS CC Cited Count: 10 SCOPUS Cited Count: 11
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Abstract :

Temperature stability is one of the key factors for energy storage application of dielectric capacitors especially under stringent environmental conditions. In this work, we report that the (Pb0.9La0.1)(Zr0.65Ti0.35)O-3 ceramic exhibits small variation of energy density (<15%) over a wide temperature range (24 degrees C similar to 83 degrees C) at low field strength (E < 25 kV/cm). Further TEM observation and phase field simulations suggest that it can be attributed to continuous formation and growth of polar nanoregions with temperature and electric field, resulting in high-temperature stability for dielectric permittivity and energy density. Our finding may have implications for developing dielectric energy-storing devices with high thermal reliability. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Ferroelectric ceramics Energy storage Dielectrics Phase transformations Ferroelectric domains

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GB/T 7714 Gao, Jinghui , Liu, Yongbin , Wang, Yan et al. High temperature-stability of (Pb0.9La0.1)(Zr0.65Ti0.35)O-3 ceramic for energy-storage applications at finite electric field strength [J]. | SCRIPTA MATERIALIA , 2017 , 137 : 114-118 .
MLA Gao, Jinghui et al. "High temperature-stability of (Pb0.9La0.1)(Zr0.65Ti0.35)O-3 ceramic for energy-storage applications at finite electric field strength" . | SCRIPTA MATERIALIA 137 (2017) : 114-118 .
APA Gao, Jinghui , Liu, Yongbin , Wang, Yan , Wang, Dong , Zhong, Lisheng , Ren, Xiaobing . High temperature-stability of (Pb0.9La0.1)(Zr0.65Ti0.35)O-3 ceramic for energy-storage applications at finite electric field strength . | SCRIPTA MATERIALIA , 2017 , 137 , 114-118 .
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Highly thermal-stable ferromagnetism by a natural composite SCIE PubMed Scopus
期刊论文 | 2017 , 8 | NATURE COMMUNICATIONS | IF: 12.353
WoS CC Cited Count: 23 SCOPUS Cited Count: 22
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All ferromagnetic materials show deterioration of magnetism-related properties such as magnetization and magnetostriction with increasing temperature, as the result of gradual loss of magnetic order with approaching Curie temperature T-C. However, technologically, it is highly desired to find a magnetic material that can resist such magnetism deterioration and maintain stable magnetism up to its T-C, but this seems against the conventional wisdom about ferromagnetism. Here we show that a Fe-Ga alloy exhibits highly thermal-stable magnetization up to the vicinity of its T-C, 880 K. Also, the magnetostriction shows nearly no deterioration over a very wide temperature range. Such unusual behaviour stems from dual-magnetic-phase nature of this alloy, in which a gradual structural-magnetic transformation occurs between two magnetic phases so that the magnetism deterioration is compensated by the growth of the ferromagnetic phase with larger magnetization. Our finding may help to develop highly thermal-stable ferromagnetic and magnetostrictive materials.

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GB/T 7714 Ma, Tianyu , Gou, Junming , Hu, Shanshan et al. Highly thermal-stable ferromagnetism by a natural composite [J]. | NATURE COMMUNICATIONS , 2017 , 8 .
MLA Ma, Tianyu et al. "Highly thermal-stable ferromagnetism by a natural composite" . | NATURE COMMUNICATIONS 8 (2017) .
APA Ma, Tianyu , Gou, Junming , Hu, Shanshan , Liu, Xiaolian , Wu, Chen , Ren, Shuai et al. Highly thermal-stable ferromagnetism by a natural composite . | NATURE COMMUNICATIONS , 2017 , 8 .
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Understanding the mechanism of large dielectric response in Pb-free (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 ferroelectric ceramics EI SCIE Scopus
期刊论文 | 2017 , 125 , 177-186 | ACTA MATERIALIA | IF: 6.036
WoS CC Cited Count: 39 SCOPUS Cited Count: 42
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(1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 (BZT-xBCT) ceramics have been reported to exhibit large dielectric response in the vicinity of the multi-phase-coexisting point (i.e. triple point). However, the reason for large dielectric response in such a material system is still unclear and thus awaits explanation. In this paper, we investigate the reason for large dielectric response by studying the phase transition behavior around the triple point of BZT-xBCT ceramics. Our results show that the transition enthalpy nearly vanishes and the associated specific heat shows discontinuity on the triple point, which suggest tricritical behavior (i.e. crossover point from first to second order phase transition) for such a triple point. Further Rayleigh analysis indicates that strong dielectric response is due to large reversible contribution which may be caused by phase transition. Moreover, TEM study shows a mottled domain structure with numerous nanodomains close to tricritical triple point, which reveals a polarization isotropic state. In addition, a six-order Landau free energy modeling demonstrates that the energy barrier between paraelectric and ferroelectric phases nearly vanishes on the tricritical triple point, which facilitates large polarizability in the presence of external electric field and is thus responsible for large dielectric permittivity in BZT-xBCT. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Domain structure Pb-free ferroelectric materials Dielectric property Phase transition

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GB/T 7714 Gao, Jinghui , Hu, Xinghao , Wang, Yan et al. Understanding the mechanism of large dielectric response in Pb-free (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 ferroelectric ceramics [J]. | ACTA MATERIALIA , 2017 , 125 : 177-186 .
MLA Gao, Jinghui et al. "Understanding the mechanism of large dielectric response in Pb-free (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 ferroelectric ceramics" . | ACTA MATERIALIA 125 (2017) : 177-186 .
APA Gao, Jinghui , Hu, Xinghao , Wang, Yan , Liu, Yongbin , Zhang, Lixue , Ke, Xiaoqin et al. Understanding the mechanism of large dielectric response in Pb-free (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 ferroelectric ceramics . | ACTA MATERIALIA , 2017 , 125 , 177-186 .
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Crucial role of octahedral untilting R3m/P4mm morphotropic phase boundary in highly piezoelectric perovskite oxide EI SCIE Scopus
期刊论文 | 2017 , 134 , 195-202 | ACTA MATERIALIA | IF: 6.036
WoS CC Cited Count: 6 SCOPUS Cited Count: 6
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Large piezoelectricity is usually found at morphotropic phase boundary (MPB), a composition-induced phase boundary between two ferroelectric phases. However, only a small fraction of MPBs (e.g., in PZT and PMN-PT) show large piezoelectricity. It remains a long-standing puzzle why not all MPBs yield large piezoelectricity. Here, by a comparative study of two MPB systems of BaZr0.2Ti0.8O3-PbTiO3 (BZT-PT) and Bi0.5Na0.5TiO3-PbTiO3 (BNT-PT), we find that the symmetry relation between the two ferroelectric phases at MPB plays a crucial role in piezoelectric activity. BZT-PT ceramic, having an R3m/P4mm MPB, exhibits strong piezoelectricity of d(33) = 500 pC/N, whereas BNT-PT ceramic, having an R3c/P4mm MPB, exhibits much weaker piezoelectricity of d(33) = 150 pC/N. The sharp difference between the two types of R/T MPBs is shown to arise from a significant difference in free energy barrier associated with oxygen octahedral tilting at MPB. An oxygen octahedral tilting/untilting transition at R3c/P4mm MPB leads to a high free energy barrier and results in low piezoelectric activity, whereas R3m/P4mm MPB with octahedral untilting produces large piezoelectricity due to low free energy barrier at such MPB. This feature show quite general in most of present MPBs systems and may become a dependable guideline for designing highly piezoelectric Pb-free materials. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Oxygen octahedral tilting Perovskite Morphotropic phase boundary (MPB) Ferroelectric Piezoelectric

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GB/T 7714 Yan, Kang , Ren, Shuai , Fang, Minxia et al. Crucial role of octahedral untilting R3m/P4mm morphotropic phase boundary in highly piezoelectric perovskite oxide [J]. | ACTA MATERIALIA , 2017 , 134 : 195-202 .
MLA Yan, Kang et al. "Crucial role of octahedral untilting R3m/P4mm morphotropic phase boundary in highly piezoelectric perovskite oxide" . | ACTA MATERIALIA 134 (2017) : 195-202 .
APA Yan, Kang , Ren, Shuai , Fang, Minxia , Ren, Xiaobing . Crucial role of octahedral untilting R3m/P4mm morphotropic phase boundary in highly piezoelectric perovskite oxide . | ACTA MATERIALIA , 2017 , 134 , 195-202 .
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Electrostrain enhancement at an invisible boundary in a single ferroelectric phase SCIE Scopus
期刊论文 | 2017 , 95 (2) | PHYSICAL REVIEW B | IF: 3.813
WoS CC Cited Count: 4 SCOPUS Cited Count: 3
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In ferroelectric materials the maximum electrostrain effect usually occurs at a phase boundary (often referred to as a "morphotropic phase boundary") between two or more different phases due to lattice instability at such compositions. As a result it is not expected that the electrostrain maximum can appear in a single ferroelectric phase regime which is away from lattice instability. In this Rapid Communication we report an unexpected finding that the electrostrain maximum occurs in a single rhombohedral phase region of the (1 x%)Ba(Ti0.8Hf0.2)O-3-x%(Ba0.7Ca0.3)TiO3 system. The composition showing the maximum electrostrain corresponds to an "invisible boundary" within the single ferroelectric phase, which is a vertical line starting from the quadruple point of the system. At the invisible boundary other anomalies, such as maximum spontaneous polarization also appear. The origin of electrostrain enhancement at the invisible boundary is considered to correlate with an easy polarization extension inherited from the quadruple point. The electrostrain enhancement effect at the invisible boundary has the advantage of having better temperature stability as compared with that at a phase boundary and thus may provide a way for designing high-electrostrain materials with improved temperature stability.

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GB/T 7714 Zhao, Luo , Ke, Xiaoqin , Wang, Weichen et al. Electrostrain enhancement at an invisible boundary in a single ferroelectric phase [J]. | PHYSICAL REVIEW B , 2017 , 95 (2) .
MLA Zhao, Luo et al. "Electrostrain enhancement at an invisible boundary in a single ferroelectric phase" . | PHYSICAL REVIEW B 95 . 2 (2017) .
APA Zhao, Luo , Ke, Xiaoqin , Wang, Weichen , Zhang, Le , Zhou, Chao , Zhou, Zhijian et al. Electrostrain enhancement at an invisible boundary in a single ferroelectric phase . | PHYSICAL REVIEW B , 2017 , 95 (2) .
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