Structural and vibrational properties of single crystals of Scandia, Sc2O3 under high pressure
Structural and vibrational properties of single crystals of Scandia, Sc2O3 under high pressure
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DOI：
10.1063/1.4933391
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发表时间：
2015-10
影响因子：
3.2
通讯作者：
S. Ovsyannikov;E. Bykova;M. Bykov;Michelle D. Wenz;A. Pakhomova;K. Glazyrin;H. Liermann;L. Dubrovinsky
中科院分区：
文献类型：
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作者：
S. Ovsyannikov;E. Bykova;M. Bykov;Michelle D. Wenz;A. Pakhomova;K. Glazyrin;H. Liermann;L. Dubrovinsky
我们报告的结果，单晶X射线衍射和拉曼光谱研究的氧化钪，Sc2 O3，在环境温度下的高压高达55和28 GPa，分别。X射线衍射和拉曼研究都表明在25-28 GPa左右的压力下从立方方铁锰矿相（所谓的C-Res相）到单斜C2/m相（所谓的B-Res相）的相变。这种转变伴随着显著的体积下降，下降了1.67%。另外，拉曼光谱在10-12 GPa附近发现了一个微小的交叉，表现为一些拉曼模的出现和消失，以及一个拉曼模的软化。在固定B′ = 4时，C-Res相和B-Res相的体积弹性模量分别为B 0 = 198.2（3）和171.2（1）GPa。因此，Sc2 O3的致密高压晶格比原始晶格软得多。我们讨论了可能的机制，可能是负责显着的弹性软化单斜高…
We report the results of single-crystal X-ray diffraction and Raman spectroscopy studies of scandium oxide, Sc2O3, at ambient temperature under high pressure up to 55 and 28 GPa, respectively. Both X-ray diffraction and Raman studies indicated a phase transition from the cubic bixbyite phase (so-called C-Res phase) to a monoclinic C2/m phase (so-called B-Res phase) at pressures around 25–28 GPa. The transition was accompanied by a significant volumetric drop by ∼6.7%. In addition, the Raman spectroscopy detected a minor crossover around 10–12 GPa, which manifested in the appearance of new and disappearance of some Raman modes, as well as in softening of one Raman mode. We found the bulk modulus values of the both C-Res and B-Res phases as B0 = 198.2(3) and 171.2(1) GPa (for fixed B′ = 4), respectively. Thus, the denser high-pressure lattice of Sc2O3 is much softer than the original lattice. We discuss possible mechanisms that might be responsible for the pronounced elastic softening in the monoclinic high...