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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
Source PublicationAPPLIED PHYSICS LETTERS
ISSN0003-6951
EISSN1077-3118
Volume109Issue:7Pages:71903
SubtypeArticle
AbstractIt 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.
DOI10.1063/1.4961236
WOS KeywordX-RAY-DIFFRACTION ; HIGH-PRESSURE ; PHASE-TRANSITION ; RAMAN-SPECTROSCOPY ; TRANSFORMATION ; MECHANISM ; GRAPHITE ; DIAMOND ; LIALO2 ; TEMPERATURE
Indexed BySCI ; ADS
Language英语
WOS SubjectPhysics, Applied
WOS IDWOS:000383787400018
ADS Bibcode2016ApPhL.109g1903H
ADS URLhttps://ui.adsabs.harvard.edu/abs/2016ApPhL.109g1903H
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2016ApPhL.109g1903H/citations
Citation statistics
Cited Times:6 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/260331
Collection多学科研究中心
Affiliation中国科学院高能物理研究所
Recommended Citation
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):71903.
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),71903.
MLA Hu, QW,et al."Micro-stress dominant displacive reconstructive transition in lithium aluminate".APPLIED PHYSICS LETTERS 109.7(2016):71903.
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