HIGH-PRESSURE PROPERTIES OF THE ALKALINE-EARTH SULFIDES

被引：17

作者：

VANCAMP, PE ^{[1
]}

VANDOREN, VE ^{[1
]}

MARTINS, JL ^{[1
]}

机构：

[1] INESC,P-1000 LISBON,PORTUGAL

来源：

PHYSICA STATUS SOLIDI B-BASIC RESEARCH | 1995年 / 190卷 / 01期

关键词：

D O I：

10.1002/pssb.2221900127

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The alkaline-earth sulphides MgS, CaS, SrS, and BaS naturally occur in the rocksalt (B1) structure. Under pressure they undergo a structural phase transformation to the cesiumchloride (B2) structure. Ab-initio local density nonlocal pseudopotential calculations of the total energy of the first three compounds are performed in the B1, B2, and in the zincblende (B3) structure. It is found that the B1 structure is stable at normal conditions while the B3 structure is unstable under all conditions. The B1 to B2 phase transformation occurs at, respectively, 230.7, 49.8, and 20.9 GPa. Recent experimental estimates of these transition pressures are 44 and 37.1 GPa for CaS. The calculated lattice constants, bulk moduli, and their pressure derivatives agree well with the experimental values.

引用

页码：193 / 197

页数：5

共 14 条

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