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Micro-stress dominant displacive reconstructive transition in lithium aluminate
Hu, QW; Lei, L; Yan, XZ; Zhang, LL; Li, XD; Peng, F; He, DW; Li XD(李晓东)
2016
发表期刊APPLIED PHYSICS LETTERS
卷号109期号:7
摘要It is supposed that diffusive reconstructive transitions usually take place under hydrostatic pressure or low stresses, and displacive reconstructive phase transitions easily occur at nonhydrostatic pressure. Here, by in-situ high pressure synchrotron X-ray diffraction and single-crystal Raman scattering studies on lithium aluminate at room temperature, we show that the reconstructive transition mechanism is dependent on the internal microscopic stresses rather than the macroscopic stresses. In this case, even hydrostatic pressure can favor the displacive transition if the compressibility of crystal is anisotropic. During hydrostatic compression, gamma-LiAlO2 transforms to delta-LiAlO2 at about 4GPa, which is much lower than that in previous nonhydrostatic experiments (above 9GPa). In the region where both phases coexist, there are enormous microscopic stresses stemming from the lattice mismatch, suggesting that this transition is displacive. Furthermore, the atomic picture is drawn with the help of the shear Raman modes. Published by AIP Publishing.
文章类型期刊论文
DOI10.1063/1.4961236
关键词[WOS]X-RAY-DIFFRACTION ; HIGH-PRESSURE ; PHASE-TRANSITION ; RAMAN-SPECTROSCOPY ; TRANSFORMATION ; MECHANISM ; GRAPHITE ; DIAMOND ; LIALO2 ; TEMPERATURE
语种英语
WOS类目Physics, Applied
WOS记录号WOS:000383787400018
引用统计
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260331
专题多学科研究中心
作者单位中国科学院高能物理研究所
推荐引用方式
GB/T 7714
Hu, QW,Lei, L,Yan, XZ,et al. Micro-stress dominant displacive reconstructive transition in lithium aluminate[J]. APPLIED PHYSICS LETTERS,2016,109(7).
APA Hu, QW.,Lei, L.,Yan, XZ.,Zhang, LL.,Li, XD.,...&李晓东.(2016).Micro-stress dominant displacive reconstructive transition in lithium aluminate.APPLIED PHYSICS LETTERS,109(7).
MLA Hu, QW,et al."Micro-stress dominant displacive reconstructive transition in lithium aluminate".APPLIED PHYSICS LETTERS 109.7(2016).
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