TEMPERATURE-DEPENDENCE OF THE STRUCTURES OF RBCAF3, AND THE DETERMINATION OF THE LOW-TEMPERATURE PHASES

被引：71

作者：

BULOU, A ^{[1
]}

RIDOU, C ^{[1
]}

ROUSSEAU, M ^{[1
]}

NOUET, J ^{[1
]}

HEWAT, AW ^{[1
]}

机构：

[1] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE

来源：

JOURNAL DE PHYSIQUE | 1980年 / 41卷 / 01期

关键词：

D O I：

10.1051/jphys:0198000410108700

中图分类号：

学科分类号：

摘要：

The temperature dependence of the structural parameters (ions coordinates and ions temperature factors) in the vicinity of the cubic to tetragonal structural phase transition of RbCaF//3 at 193 K is reported together with the structure of this compound below 50 K. The neutron powder profile refinement method was used to carry out this study. The same space group was found at 20 K and 4. 5 K. Equality of the CaF//6 tilt angles about each of the three 100 cubic axes in the low temperature phase and the behavior of the temperature factors in the cubic and tetragonal phases indicate an order-disorder character of the 193 K and 50 K phase transitions.

引用

页码：87 / 96

页数：10

共 30 条

[1] K-193 PHASE-TRANSITION IN RBCAF3 .2. CRITICAL NEUTRON-SCATTERING [J].

ALMAIRAC, R ;

ROUSSEAU, M ;

GESLAND, JY ;

NOUET, J ;

HENNION, B .

JOURNAL DE PHYSIQUE, 1977, 38 (11) :1429-1434

[2]

BORSA F, 1976, LOCAL PROPERTIES PHA

[3] ORDER-DISORDER BEHAVIOR AT DISPLACIVE STRUCTURAL PHASE-TRANSITIONS [J].

BRUCE, AD ;

MULLER, KA ;

BERLINGER, W .

PHYSICAL REVIEW LETTERS, 1979, 42 (03) :185-188

[4]

BULOU A, 1979, J PHYS LETT-PARIS, V40, pL277, DOI 10.1051/jphyslet:019790040013027700

[5] TRICRITICAL BEHAVIOR IN UNIAXIALLY STRESSED RBCAF3 [J].

BUZARE, JY ;

FAYET, JC ;

BERLINGER, W ;

MULLER, KA .

PHYSICAL REVIEW LETTERS, 1979, 42 (07) :465-468

[6] PROFILE ANALYSIS OF POWDER NEUTRON-DIFFRACTION DATA - ITS SCOPE, LIMITATIONS, AND APPLICATIONS IN SOLID-STATE CHEMISTRY [J].

CHEETHAM, AK ;

TAYLOR, JC .

JOURNAL OF SOLID STATE CHEMISTRY, 1977, 21 (03) :253-275

[7]

COMES, 1969, THESIS ORSAY

[8]

DARLINGTON CNW, 1979, PHYS STATUS SOLIDI B, V76, P231

[9] STRUCTURE OF SODIUM NIOBATE (T2) AT 600 DEGREES C, AND CUBIC-TETRAGONAL TRANSITION IN RELATION TO SOFT-PHONON MODES [J].

GLAZER, AM ;

MEGAW, HD .

PHILOSOPHICAL MAGAZINE, 1972, 25 (05) :1119-+

[10] SIMPLE WAYS OF DETERMINING PEROVSKITE STRUCTURES [J].

GLAZER, AM .

ACTA CRYSTALLOGRAPHICA SECTION A, 1975, 31 (NOV1) :756-762

← 1 2 3 →