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摘要: 我们用金刚石压砧装置(DAC)高压X射线粉末衍射照相方法,研究了-BaB2O4晶体的相变。压力从0.1 MPa逐步加至17.6 GPa,发现BBO由室温下的六方相经历了若干次相变后,当压力加至11.5 GPa时,转变为无定形相。在11.5 GPa压力前的相变是可逆的,一旦进入无定形相,则相变是不可逆的。
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关键词:
- 偏硼酸钡(简称-BBO) /
- 压致相变 /
- X光衍射 /
- 金刚石压砧装置
Abstract: Phase transitions of -BaB2O4 crystal have been studied by using X-ray powder diffraction technique with a diamond anvil cell (DAC) at high pressure up to 17.6 GPa. According to the X-ray diffraction results, -BaB2O4 crystal undergoes three pressure-induced phase transitions neat 2.2 GPa, 5.3 GPa, 11.5 GPa, respectively. The phase transitions are reversible below 11.5 GPa. -BaB2O4 becomes amorphous and the phase transition is irreversible above 11.5 GPa. -
Lin Yuankun, Cai Qingrui, Lan Guoxiang, et al. Spectroehemica Acta, 1992, 48 A(5): 653-657. Sankaran Hema, Sikka S K, Sharma S M, et al. Physical Review B, 1988, 38(1): 170-173. -

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