Sintering　of　advanced　thermal　barrier　coatings　(TBCs)　at　high　temperatures　is　key　challenge　as　it　can　adversely　affect　service　performance　and　thermal　fatigue　resistance　of　TBCs.　In　this　study,　sintering　behavior　of　pyrochlore-type　La2(Zr0.7Ce0.3)2O7　(LZ7C3)　was　investigated　using　experiments　and　molecular　dynamics.　Meanwhile,　the　corresponding　dynamic　process　and　behind　mechanism　were　uncovered.　Results　showed　that　novel　LZ7C3　exhibited　significantly　higher　sintering　resistance　than　host　La2Zr2O7　(LZ)　and　typical　8　wt%　yttria-stabilized　zirconia　(8YSZ)　at　temperature　up　to　1773　K,　which　indicated　that　pyrochlore-type　LZ7C3　is　a　promising　TBC　candidate　to　replace　conventional　8YSZ　at　high　temperatures.　Further　study　also　revealed　that　initial　stage　played　crucial　role　in　sintering　process,　and　the　sintering　mainly　occurred　at　grain　boundary　(GB)　region.　Intrinsic　sintering　activation　energy　of　LZ7C3　GB　(695.248　J　mol−1)　is　larger　than　that　of　LZ　GB　(384.171　J　mol−1)　and　8YSZ　GB　(173.303　J　mol−1),　which　resulted　in　outstanding　sintering　resistance　for　LZ7C3.　Furthermore,　no　obvious　enrichment　of　second　phase　was　observed　at　the　GB　of　LZ7C3.　This　study　thus　concluded　that　hindering　the　atomic　diffusion　of　GB,　as　well　as　introducing　foreign　atom　with　larger　mass　and　bond　energy　may　act　as　effective　strategy　to　enhance　the　sintering　resistance　of　TBCs　materials.　©　2020