Equation of state of elbaite at high pressure up to 21.1 GPa and room temperature
Equation of state of elbaite at high pressure up to 21.1 GPa and room temperature
复制标题
DOI：
10.1007/s00269-022-01201-w
复制
发表时间：
2022-07
影响因子：
1.4
通讯作者：
Wei Chen;Shijie Huang;Z. Ye;Jiamei Song;Shanrong Zhang;Meng-yun Wu;D. Fan;Wenge Zhou
中科院分区：
文献类型：
--
作者：
Wei Chen;Shijie Huang;Z. Ye;Jiamei Song;Shanrong Zhang;Meng-yun Wu;D. Fan;Wenge Zhou
本研究首次使用原位同步加速器 X 射线衍射在室温和高达 21.1 GPa 的压力下研究了天然锂辉石样品的状态方程。在实验压力范围内没有观察到锂辉石的相变。压力-体积数据采用三阶Birch-Murnaghan状态方程（EoS）拟合，零压晶胞体积V0=1540.7（6）Å3，零压体积模量KT0=114.7（7）GPa，其压力导数K'T0= 4.2（1），同时得到V0=1540.1（4）当固定K'T0= 4时，Å3和KT0= 116.4 (4) GPa。此外，对钠钾石的轴向压缩行为也采用线性化三阶Birch-Murnaghan EoS进行拟合，得到a轴和c轴的轴向模量分别为Ka0= 201 (4) GPa和Kc0= 60 (1) GPa。 a轴和c轴的轴向压缩系数分别为βa= 1.66 × 10–3GPa−1和βc= 5.56 × 10–3GPa−1，各向异性比为βa:βc= 0.30:1.00，表现出强烈的轴向压缩各向异性。进一步讨论了电气石体积模量和各向异性线性压缩率的潜在影响因素。
The equation of the state of a natural elbaite sample has been investigated at room temperature and up to 21.1 GPa for the first time using in situ synchrotron X-ray diffraction in this study. No phase transition is observed on elbaite over the experimental pressure range. The pressure–volume data were fitted by the third-order Birch-Murnaghan equation of state (EoS) with the zero-pressure unit-cell volumeV0= 1540.7 (6) Å3, the zero-pressure bulk modulusKT0= 114.7 (7) GPa, and its pressure derivativeK'T0= 4.2 (1), while obtainedV0= 1540.1 (4) Å3andKT0= 116.4 (4) GPa when fixedK'T0= 4. Furthermore, the axial compressional behavior of elbaite was also fitted with a linearized third-order Birch-Murnaghan EoS, the obtained axial moduli fora-axis andc-axis areKa0= 201 (4) GPa andKc0= 60 (1) GPa, respectively. The axial compressibilities ofa-axis andc-axis areβa= 1.66 × 10–3GPa−1andβc= 5.56 × 10–3GPa−1with an anisotropic ratio ofβa:βc= 0.30: 1.00, which shows an intense axial compression anisotropy. The potential influencing factors on the bulk moduli and the anisotropic linear compressibilities of tourmalines were further discussed.