STRUCTURAL-CHANGE OF GEO2 UNDER PRESSURE

被引：35

作者：

KAWASAKI, S ^{[1
]}

OHTAKA, O ^{[1
]}

YAMANAKA, T ^{[1
]}

机构：

[1] OSAKA UNIV,COLL GEN EDUC,TOYONAKA,OSAKA 560,JAPAN

来源：

PHYSICS AND CHEMISTRY OF MINERALS | 1994年 / 20卷 / 08期

关键词：

D O I：

10.1007/BF00211848

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Pressure-induced amorphization of alpha-quartz type GeO2 was studied with a newly developed X-ray diffraction system which consists of a 4-circle goniometer and a curved position sensitive detector. Single-crystal diffraction was measured under pressurs up to 7.3 GPa at room temperature in order to investigate pretransitional phenomena. Diffraction intensity and line width of the diffraction profiles showed no remarkable change up to 5.9 GPa. However, no sharp diffraction line was observed at pressures over 6.5 GPa. The bulk modulus at 0.1 MPa and its pressure derivative of alpha-quartz type GeO2 were determined to be K(T) = 32.8(3.3) GPa and K(T) = 6.0(2.0), respectively. In situ microscopic observations of the amorphization transformation was also performed. The large volume change due to amorphization was observed and estimated to be about 10%.

引用

页码：531 / 535

页数：5

共 28 条

[1] FINITE STRAIN ISOTHERM AND VELOCITIES FOR SINGLE-CRYSTAL AND POLYCRYSTALLINE NACL AT HIGH-PRESSURES AND 300-DEGREE-K [J].