A new high-pressure phase of strontium carbonate
A new high-pressure phase of strontium carbonate
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DOI：
10.1007/s00269-004-0428-5
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发表时间：
2005-01
影响因子：
1.4
通讯作者：
S. Ono;M. Shirasaka;T. Kikegawa;Y. Ohishi
中科院分区：
文献类型：
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作者：
S. Ono;M. Shirasaka;T. Kikegawa;Y. Ohishi
用同步x射线衍射方法在激光加热金刚石砧池中进行了高压和高温实验，发现文石型SrCO3at在高于10 GPa的压力下发生了相变。新相具有正交对称性，并被证实在32 GPa时保持稳定。根据实验单元胞参数确定了新相的Birch-Murnaghan状态方程，K0= 101（±16）GPa, K0′= 4（约束值），V0= 111.9（±2.2）。srco3中的这种转化不同于以往研究报道的BaCO3as。在常压下减压后，高压相转变为具有正交对称的亚稳态结构。这一结果也解决了关于BaCO3中稳定高压相的争议，BaCO3是caco3和SrCO3的模拟材料。
High-pressure and high-temperature experiments conducted in a laser-heated diamond-anvil cell with a synchrotron X-ray diffraction method have revealed a phase transformation in the aragonite-type SrCO3at pressures above 10 GPa. The new phase has an orthorhombic symmetry and was confirmed to remain stable to 32 GPa. The Birch-Murnaghan equation of state for new phase was determined from the experimental unit cell parameters, with K0= 101 (± 16) GPa, K0’ = 4 (constrained value), and V0= 111.9 (± 2.2). This transformation in SrCO3is different from that in BaCO3as reported in previous studies. After decompression at ambient pressure, the high-pressure phase transforms to a metastable structure, which has an orthorhombic symmetry. This result should also resolve a dispute regarding the stable high-pressure phases in BaCO3, which is an analog material of CaCO3and SrCO3.