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Superposition of conventional and spontaneous exchange bias in a Ni50Mn34In13Fe3 magnetic shape memory alloy EI Scopus SCIE
期刊论文 | 2019 , 772 , 988-993 | Journal of Alloys and Compounds
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

The conventional exchange bias and spontaneous exchange bias are two interesting but fundamentally different effects in Mn rich Ni-Mn-Z magnetic shape memory alloys. Previous investigations show that these two phenomena appear separately. Here, we report that the conventional and spontaneous exchange bias phenomena coexist in a Ni50Mn34In13Fe3 alloy and the superposition of them increases the total exchange bias of the alloy. Our results suggest that the canonical spin glass and super spin glass may coexist and are embedded in the antiferromagnetic matrix of the martensite, through properly tuning the temperature-field history, which further results in the superposition of conventional and spontaneous exchange bias for this alloy. The interfacial interaction between the canonical spin glass and the antiferromagnetic matrix forms during field cooling process, which results in the conventional exchange bias. Moreover, the application of large magnetic field during the isothermal magnetization process changes the superspin glass into a superferromagnetic state, which interacts with the antiferromagnetic matrix at the interface, causing the spontaneous exchange bias. The superposition of exchange bias provides an effective way to achieve large exchange bias in materials. © 2018 Elsevier B.V.

Keyword :

Antiferromagnetic matrix Different effects Exchange bias Field cooling process Interfacial interaction Isothermal magnetization Magnetic shape memory alloys Superspin glass

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GB/T 7714 Liao, Xiaoqi , Wang, Yu , Wetterskog, Erik et al. Superposition of conventional and spontaneous exchange bias in a Ni50Mn34In13Fe3 magnetic shape memory alloy [J]. | Journal of Alloys and Compounds , 2019 , 772 : 988-993 .
MLA Liao, Xiaoqi et al. "Superposition of conventional and spontaneous exchange bias in a Ni50Mn34In13Fe3 magnetic shape memory alloy" . | Journal of Alloys and Compounds 772 (2019) : 988-993 .
APA Liao, Xiaoqi , Wang, Yu , Wetterskog, Erik , Cheng, Fei , Hao, Chunxi , Khan, Muhammad Tahir et al. Superposition of conventional and spontaneous exchange bias in a Ni50Mn34In13Fe3 magnetic shape memory alloy . | Journal of Alloys and Compounds , 2019 , 772 , 988-993 .
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Large-scale synthesis of ultrathin lanthanide carbonate hydroxides nanowires for potential biomedical applications CPCI-S SCIE
会议论文 | 2018 , 255 | 255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water
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GB/T 7714 Zhang, Xinyu , Li, Yannan , Ge, Juan et al. Large-scale synthesis of ultrathin lanthanide carbonate hydroxides nanowires for potential biomedical applications [C] . 2018 .
MLA Zhang, Xinyu et al. "Large-scale synthesis of ultrathin lanthanide carbonate hydroxides nanowires for potential biomedical applications" . (2018) .
APA Zhang, Xinyu , Li, Yannan , Ge, Juan , Qin, Lei , Zheng, Yanzhen , Lei, Bo et al. Large-scale synthesis of ultrathin lanthanide carbonate hydroxides nanowires for potential biomedical applications . (2018) .
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High-nulcearity Ni-Ln (Ln = lanthanide) heterometallic clusters - Synthesis and magnetic studies CPCI-S SCIE
会议论文 | 2018 , 256 | 256th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nanoscience, Nanotechnology and Beyond
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GB/T 7714 Fairley, Melissa , Qin, Lei , Zheng, Yan-Zhen et al. High-nulcearity Ni-Ln (Ln = lanthanide) heterometallic clusters - Synthesis and magnetic studies [C] . 2018 .
MLA Fairley, Melissa et al. "High-nulcearity Ni-Ln (Ln = lanthanide) heterometallic clusters - Synthesis and magnetic studies" . (2018) .
APA Fairley, Melissa , Qin, Lei , Zheng, Yan-Zhen , Zheng, Zhiping . High-nulcearity Ni-Ln (Ln = lanthanide) heterometallic clusters - Synthesis and magnetic studies . (2018) .
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"Merged-chelating" approach for constructing high-spin Mn aggregate: A [Mn-2(III)] dimer and a 2-D honeycomb network based on star-shaped [Mn-II Mn-3(III)] tetramer SCIE Scopus
期刊论文 | 2018 , 148 , 44-48 | POLYHEDRON
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

Pyridin-2-ylmethanols (hmp) and 1, 3-propanediols have been proven to be successful ligands for constructing high-spin manganese clusters. In this work, both ligands are merged into one framework, resulting in a new tridentate ligand 4-chloro-2-(hydroxy(pyridin-2-yl)methyl)phenol. Its initial attempt in Mn coordination chemistry harvested a Mn-III dimer [Mn-2(III)(L)(2)(AcAc)(2)] and a 2-D honeycomb network based on star-shaped [(MnMn3III)-Mn-II] tetramer {[(MnMn3III)-Mn-II(Na)(1.5)(L)(6)](OH)(0.)(5)center dot(MeOH)(1.5)}(n). The two clusters were characterized by single crystal X-ray diffraction, IR spectra, elemental analysis, and magnetic measurements. Magnetic studies revealed dominant ferromagnetic interactions within the Mn-III dimer and star-shaped [(MnMn3III)-Mn-II] tetramer unit. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

High spin molecules Mn clusters Magnetism Ligand design Coordination network

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GB/T 7714 Bai, Jiaquan , Yang, Chao , Li, Guanghua et al. "Merged-chelating" approach for constructing high-spin Mn aggregate: A [Mn-2(III)] dimer and a 2-D honeycomb network based on star-shaped [Mn-II Mn-3(III)] tetramer [J]. | POLYHEDRON , 2018 , 148 : 44-48 .
MLA Bai, Jiaquan et al. ""Merged-chelating" approach for constructing high-spin Mn aggregate: A [Mn-2(III)] dimer and a 2-D honeycomb network based on star-shaped [Mn-II Mn-3(III)] tetramer" . | POLYHEDRON 148 (2018) : 44-48 .
APA Bai, Jiaquan , Yang, Chao , Li, Guanghua , Bi, Yanfeng , Li, Xiaolei , Tang, Jinkui et al. "Merged-chelating" approach for constructing high-spin Mn aggregate: A [Mn-2(III)] dimer and a 2-D honeycomb network based on star-shaped [Mn-II Mn-3(III)] tetramer . | POLYHEDRON , 2018 , 148 , 44-48 .
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Pseudotetrahedral cobalt(II) complexes with PNP-ligands showing uniaxial magnetic anisotropy EI SCIE PubMed
期刊论文 | 2018 , 47 (27) , 8874-8878 | DALTON TRANSACTIONS
WoS CC Cited Count: 1
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Two mononuclear pseudotetrahedral cobalt(II) complexes with the formula Co(PNP)X-2, where X = Cl (1) or X = SCN (2) and PNP = bis(2-(diphenylphosphaneyl)-4-methylphenyl)amine, have been synthesised. Magnetic and high-frequency/field electron paramagnetic resonance (HF-EPR) spectroscopy and ab initio calculation studies reveal that both complexes show uniaxial magnetic anisotropy.

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GB/T 7714 Zhai, Yuan-Qi , Deng, Yi-Fei , Zheng, Yan-Zhen . Pseudotetrahedral cobalt(II) complexes with PNP-ligands showing uniaxial magnetic anisotropy [J]. | DALTON TRANSACTIONS , 2018 , 47 (27) : 8874-8878 .
MLA Zhai, Yuan-Qi et al. "Pseudotetrahedral cobalt(II) complexes with PNP-ligands showing uniaxial magnetic anisotropy" . | DALTON TRANSACTIONS 47 . 27 (2018) : 8874-8878 .
APA Zhai, Yuan-Qi , Deng, Yi-Fei , Zheng, Yan-Zhen . Pseudotetrahedral cobalt(II) complexes with PNP-ligands showing uniaxial magnetic anisotropy . | DALTON TRANSACTIONS , 2018 , 47 (27) , 8874-8878 .
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A Multifunctional Lanthanide Carbonate Cluster Based Metal-Organic Framework Exhibits High Proton Transport and Magnetic Entropy Change SCIE PubMed Scopus
期刊论文 | 2018 , 57 (15) , 9020-9027 | INORGANIC CHEMISTRY
WoS CC Cited Count: 9 SCOPUS Cited Count: 10
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A novel multifunctional, three-dimensional (3D) lanthanide carbonate cluster based metal organic framework (MOF) with the general formula {[Gd-2(CO3)(ox)(2)(H2O)(2)]3H(2)O}(n) (1) has been synthesized via self-assembly of gadolinium (Gd) carbonate and oxalate under hydrothermal conditions. Single-crystal X-ray diffraction reveals that the compound 1 consists of the Gd carbonate cluster with oxalic acid ligands, which form a 3D framework structure with an ordered one-dimensional (1D) pore channel along the a-axis. The coordination water molecules of Gd3+ ions point to the interior of the pore and form a 1D hydrogen bond pathway with oxygen atoms in adjacent oxalic acid that is stable at high temperature (up to 150 degrees C). The compound 1 features multiple hydrogen-bonding walls and good thermal stabilities, and shows the highest proton conductivity of 1.98 x 10(-3) S cm(-1) at T = 150 degrees C and in room air without additional humidity. Magnetic investigations of compound 1 demonstrate that weak antiferromagnetic couplings between adjacent Gd3+ ions bring about large cryogenic magnetocaloric effects. Remarkably, the maximum entropy change (-Delta S-m) of compound 1 reaches 58.5 J kg(-1) K-1 at 2 K for a moderate field change (Delta H = 7 T). Moreover, the isomorphous MOFs: {[Ln(2)(CO3)(ox)(2)(H2O)(2)]3H(2)O}(n) (Ln(3+) = Ce3+(2), Pr3+(3), Nd3+(4), Tb3+(5)) also are structurally and functionally characterized, and compounds 2-5 exhibit proton conductivity above 10(-3) S cm(-1) in room air and without additional humidity.

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GB/T 7714 Tang, Qun , Yang, Yan-Li , Zhang, Ning et al. A Multifunctional Lanthanide Carbonate Cluster Based Metal-Organic Framework Exhibits High Proton Transport and Magnetic Entropy Change [J]. | INORGANIC CHEMISTRY , 2018 , 57 (15) : 9020-9027 .
MLA Tang, Qun et al. "A Multifunctional Lanthanide Carbonate Cluster Based Metal-Organic Framework Exhibits High Proton Transport and Magnetic Entropy Change" . | INORGANIC CHEMISTRY 57 . 15 (2018) : 9020-9027 .
APA Tang, Qun , Yang, Yan-Li , Zhang, Ning , Liu, Zheng , Zhang, Shu-Hua , Tang, Fu-Shun et al. A Multifunctional Lanthanide Carbonate Cluster Based Metal-Organic Framework Exhibits High Proton Transport and Magnetic Entropy Change . | INORGANIC CHEMISTRY , 2018 , 57 (15) , 9020-9027 .
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Effect of ligand substitution on the SMM properties of three isostructural families of double-cubane Mn(4)Ln(2) coordination clusters EI SCIE Scopus
期刊论文 | 2018 , 47 (10) , 3485-3495 | DALTON TRANSACTIONS
WoS CC Cited Count: 8 SCOPUS Cited Count: 4
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Three isostructural lanthanide series with a core of Mn(2)(III)Mn(2)(II)Ln(2) are reported. These three families have the formulae of [Mn(2)(III)Mn(2)(II)Ln(2)(mu(4)-O)(2)(H(2)edte)(2)(piv)(6)(NO3)(2)] {no crystallization solvent, Ln = La, Ce, Pr, Nd, Eu (1-4, 6); solv = 3MeCN, Ln = Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Y (5, 7-13)}, where H(2)edte = N, N, N', N'-tetrakis(2-hydroxyethyl) ethylenediamine and piv = pivalate; [Mn(2)(III)Mn(2)(II)Ln(2)(mu(4)-O)(2)(H(2)edte)(2)(benz)(6)(NO3)(2)], where benz = benzoate, or [Mn(2)(III)Mn(2)(II)Ln(2)(mu(4)-O)(2)(edteH(2))(2)(benz)(6)(NO3)(2)]center dot 2MeCN {Ln = Gd, Tb, Dy (14-16); and [Mn(2)(III)Mn(2)(II)Ln(2)(mu(4)-O)(2)(edteH(2))(2)(piv)(8)]center dot solv {solv = 4MeCN, Ln = La (17); solv = 2MeCN center dot tol center dot H2O, Ln = Pr, Nd, Sm, Tb (18-20, 22); solv = 2MeCN center dot H2O, Ln = Gd (21). These compounds crystallize in two different systems, namely, monoclinic in the space groups P2(1)/n for 1-4, 6, and 14-16 and C2/c for 5, 7-13, 18-20, and 22 and triclinic in the space group P (1) over bar for 17 and 21. The crystal structures of these compounds display a face-fused dicubane structure connected by different types of bridged oxygen atoms. Solid-state dc magnetic susceptibility characterization was carried out for 1-22, and fitting showed that Mn-III. . .Mn-III is antiferromagnetically (AF) coupled and Mn-II. . . Mn-III, Mn-II. . .Ln and Mn-III. . .Ln are weakly ferromagnetically coupled. In addition, ac measurements were carried out and showed that only 7, 15, and 22 for Tb, 8 and 16 for Dy, and 20 for Sm exhibited slow magnetization relaxation. In the case of 15, it was possible to determine the energy barrier of the slow-relaxation behavior by fitting peak temperatures to the Arrhenius law, which gave a value of U-eff = 21.2 K and a pre-exponential factor of tau(0) = 4.0 x 10(-9) s.

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GB/T 7714 Akhtar, Muhammad Nadeem , Lan, Yanhua , AlDamen, Murad A. et al. Effect of ligand substitution on the SMM properties of three isostructural families of double-cubane Mn(4)Ln(2) coordination clusters [J]. | DALTON TRANSACTIONS , 2018 , 47 (10) : 3485-3495 .
MLA Akhtar, Muhammad Nadeem et al. "Effect of ligand substitution on the SMM properties of three isostructural families of double-cubane Mn(4)Ln(2) coordination clusters" . | DALTON TRANSACTIONS 47 . 10 (2018) : 3485-3495 .
APA Akhtar, Muhammad Nadeem , Lan, Yanhua , AlDamen, Murad A. , Zheng, Yan-Zhen , Anson, Christopher E. , Powell, Annie K. . Effect of ligand substitution on the SMM properties of three isostructural families of double-cubane Mn(4)Ln(2) coordination clusters . | DALTON TRANSACTIONS , 2018 , 47 (10) , 3485-3495 .
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Quantum Monte Carlo simulations of a giant {Ni21Gd20} cage with a S=91 spin ground state SCIE PubMed Scopus
期刊论文 | 2018 , 9 | NATURE COMMUNICATIONS
WoS CC Cited Count: 6 SCOPUS Cited Count: 5
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The detailed analysis of magnetic interactions in a giant molecule is difficult both because the synthesis of such compounds is challenging and the number of energy levels increases exponentially with the magnitude and number of spins. Here, we isolated a {Ni21Gd20} nanocage with a large number of energy levels (approximate to 5 x 10(30)) and used quantum Monte Carlo (QMC) simulations to perform a detailed analysis of magnetic interactions. Based on magnetization measurements above 2 K, the QMC simulations predicted very weak ferromagnetic interactions that would give a record S = 91 spin ground state. Low-temperature measurements confirm the spin ground state but suggest a more complex picture due to the single ion anisotropy; this has also been modeled using the QMC approach. The high spin and large number of low-lying states lead to a large low-field magnetic entropy (14.1 J kg(-1) K-1 for Delta H = 1 T at 1.1 K) for this material.

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GB/T 7714 Chen, Wei-Peng , Singleton, Jared , Qin, Lei et al. Quantum Monte Carlo simulations of a giant {Ni21Gd20} cage with a S=91 spin ground state [J]. | NATURE COMMUNICATIONS , 2018 , 9 .
MLA Chen, Wei-Peng et al. "Quantum Monte Carlo simulations of a giant {Ni21Gd20} cage with a S=91 spin ground state" . | NATURE COMMUNICATIONS 9 (2018) .
APA Chen, Wei-Peng , Singleton, Jared , Qin, Lei , Camon, Agustin , Engelhardt, Larry , Luis, Fernando et al. Quantum Monte Carlo simulations of a giant {Ni21Gd20} cage with a S=91 spin ground state . | NATURE COMMUNICATIONS , 2018 , 9 .
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Rationalization of single-molecule magnet behavior in a three-coordinate Fe(iii) complex with a high-spin state (: S = 5/2) EI Scopus CSSCI-E SCIE
期刊论文 | 2018 , 5 (10) , 2486-2492 | Inorganic Chemistry Frontiers
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Here we show that in the perfect trigonal-planar geometry the iron(iii) complex Fe[N(SiMe3)2]31 simultaneously has a high spin state (S = 5/2) and uniaxial magnetic anisotropy (with a zero-field splitting parameter D = -1.15(2) cm-1), as revealed by the dc SQUID magnetic susceptibility measurement, high frequency/field electron paramagnetic resonance (HF-EPR) spectroscopy and ab initio theoretical calculations. Moreover, ac magnetization data reveal a dynamic magnetic behavior with an energy barrier for magnetization reversal of 6.91(5) cm-1, and pulsed high-field magnetization shows a magnetic bistability at low-temperatures. Thus, 1 is confirmed to be a single-molecule magnet. © 2018 the Partner Organisations.

Keyword :

Ab initio theoretical calculations Dynamic magnetic behavior High-field magnetization Magnetic bistability Magnetic susceptibility measurements Single-molecule magnet Uniaxial magnetic anisotropy Zero-field splitting parameters

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GB/T 7714 Ge, Ning , Zhai, Yuan-Qi , Deng, Yi-Fei et al. Rationalization of single-molecule magnet behavior in a three-coordinate Fe(iii) complex with a high-spin state (: S = 5/2) [J]. | Inorganic Chemistry Frontiers , 2018 , 5 (10) : 2486-2492 .
MLA Ge, Ning et al. "Rationalization of single-molecule magnet behavior in a three-coordinate Fe(iii) complex with a high-spin state (: S = 5/2)" . | Inorganic Chemistry Frontiers 5 . 10 (2018) : 2486-2492 .
APA Ge, Ning , Zhai, Yuan-Qi , Deng, Yi-Fei , Ding, You-Song , Wu, Tao , Wang, Zhen-Xing et al. Rationalization of single-molecule magnet behavior in a three-coordinate Fe(iii) complex with a high-spin state (: S = 5/2) . | Inorganic Chemistry Frontiers , 2018 , 5 (10) , 2486-2492 .
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Field- and temperature-dependent quantum tunnelling of the magnetisation in a large barrier single-molecule magnet SCIE PubMed Scopus
期刊论文 | 2018 , 9 | NATURE COMMUNICATIONS
WoS CC Cited Count: 20 SCOPUS Cited Count: 20
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Understanding quantum tunnelling of the magnetisation (QTM) in single-molecule magnets (SMMs) is crucial for improving performance and achieving molecule-based information storage above liquid nitrogen temperatures. Here, through a field-and temperature-dependent study of the magnetisation dynamics of [Dy((BuO)-Bu-t)Cl(THF)(5)][BPh4]center dot 2THF, we elucidate the different relaxation processes: field-independent Orbach and Raman mechanisms dominate at high temperatures, a single-phonon direct process dominates at low temperatures and fields > 1 kOe, and a field- and temperature-dependent QTM process operates near zero field. Accounting for the exponential temperature dependence of the phonon collision rate in the QTM process, we model the magnetisation dynamics over 11 orders of magnitude and find a QTM tunnelling gap on the order of 10(-4) to 10(-5) cm(-1). We show that removal of Dy nuclear spins does not suppress QTM, and argue that while internal dipolar fields and hyperfine coupling support QTM, it is the dynamic crystal field that drives efficient QTM.

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GB/T 7714 Ding, You-Song , Yu, Ke-Xin , Reta, Daniel et al. Field- and temperature-dependent quantum tunnelling of the magnetisation in a large barrier single-molecule magnet [J]. | NATURE COMMUNICATIONS , 2018 , 9 .
MLA Ding, You-Song et al. "Field- and temperature-dependent quantum tunnelling of the magnetisation in a large barrier single-molecule magnet" . | NATURE COMMUNICATIONS 9 (2018) .
APA Ding, You-Song , Yu, Ke-Xin , Reta, Daniel , Ortu, Fabrizio , Winpenny, Richard E. P. , Zheng, Yan-Zhen et al. Field- and temperature-dependent quantum tunnelling of the magnetisation in a large barrier single-molecule magnet . | NATURE COMMUNICATIONS , 2018 , 9 .
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