Universal elastic-hardening-driven mechanical instability in alpha-quartz and quartz homeotypes under pressure
Dong JC(董俊才); Zhu HL(朱海亮); Chen DL(陈栋梁); Dong, JC; Zhu, HL; Chen, DL
刊名SCIENTIFIC REPORTS
2015
卷号5页码:10810
学科分类Science & Technology - Other Topics
DOI10.1038/srep10810
通讯作者陈栋梁
文章类型Article
英文摘要As a fundamental property of pressure-induced amorphization (PIA) in ice and ice-like materials (notably alpha-quartz), the occurrence of mechanical instability can be related to violation of Born criteria for elasticity. The most outstanding elastic feature of alpha-quartz before PIA has been experimentally reported to be the linear softening of shear modulus C-44, which was proposed to trigger the transition through Born criteria B-3. However, by using density-functional theory, we surprisingly found that both C-44 and C-66 in alpha-quartz exhibit strong nonlinearity under compression and the Born criteria B-3 vanishes dominated by stiffening of C-14, instead of by decreasing of C-44. Further studies of archetypal quartz homeotypes (GeO2 and AlPO4) repeatedly reproduced the same elastic-hardening-driven mechanical instability, suggesting a universal feature of this family of crystals and challenging the long-standing idea that negative pressure derivatives of individual elastic moduli can be interpreted as the precursor effect to an intrinsic structural instability preceding PIA. The implications of this elastic anomaly in relation to the dispersive softening of the lowest acoustic branch and the possible transformation mechanism were also discussed.
类目[WOS]Multidisciplinary Sciences
收录类别SCI ; MEDLINE
WOS记录号WOS:000356660500001
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228412
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
中国科学院高能物理研究所_多学科研究中心
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Dong JC,Zhu HL,Chen DL,et al. Universal elastic-hardening-driven mechanical instability in alpha-quartz and quartz homeotypes under pressure[J]. SCIENTIFIC REPORTS,2015,5:10810.
APA 董俊才,朱海亮,陈栋梁,Dong, JC,Zhu, HL,&Chen, DL.(2015).Universal elastic-hardening-driven mechanical instability in alpha-quartz and quartz homeotypes under pressure.SCIENTIFIC REPORTS,5,10810.
MLA 董俊才,et al."Universal elastic-hardening-driven mechanical instability in alpha-quartz and quartz homeotypes under pressure".SCIENTIFIC REPORTS 5(2015):10810.
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