THE PREPARATION AND STRUCTURE OF THE ALPHA-QUARTZ AND BETA-QUARTZ POLYMORPHS OF BERYLLIUM FLUORIDE

被引：29

作者：

WRIGHT, AF ^{[1
]}

FITCH, AN ^{[1
]}

WRIGHT, AC ^{[1
]}

机构：

[1] JJ THOMSON PHYS LAB,READING RG6 2AF,ENGLAND

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1988年 / 73卷 / 02期

关键词：

CRYSTALS; -; Structure;

D O I：

10.1016/0022-4596(88)90113-2

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Devitrification of vitreous BeF//2 at 355 degree C yields beta -quartz BeF//2 which on cooling to ambient temperature undergoes a displacive transition to give the alpha -quartz form. Both alpha - and beta -quartz BeF//2 have tetrahedral (BeF//4) structures which are very closely related to the corresponding SiO//2 polymorphs. At ambient temperature the Be-F bond lengths are 1. 541(2) and 1. 544(2) Angstrom and the Be-F-Be angle is 144. 6(2) degree . For beta -quartz BeF//2 at 246 degree C the corresponding average values in the micro-twinned structure are 1. 535 Angstrom and 150. 3 degree , respectively.

引用

页码：298 / 304

页数：7

共 29 条

[1]

ARNOLD H, 1962, Z KRISTALLOGRAPHIE, V0117

[2]

BATSANOVA LR, 1968, J STRUCT CHEM, V9, P63

[3] The structure of alpha and beta quartz. [J].

Bragg, W ;

Gibbs, RE .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-CONTAINING PAPERS OF A MATHEMATICAL AND PHYSICAL CHARACTER, 1925, 109 (751) :405-427

[4]

BRUSENTSEV FA, 1967, J STRUCT CHEM, V8, P159

[5]

DACHILLE F., 1959, Z KRISTALLOGR, V111, P451

[6]

DESA JAE, 1982, J NON-CRYST SOLIDS, V51, P57, DOI 10.1016/0022-3093(82)90189-2

[7]

EVEREST DA, 1964, CHEM BERYLLIUM, pCH4

[8]

FINCH CB, 1960, USAEC AECTR3992 REP

[9] THE PHILLIPS,J.C. MODEL FOR VITREOUS SIO2 - A CRITICAL-APPRAISAL [J].

GALEENER, FL ;

WRIGHT, AC .

SOLID STATE COMMUNICATIONS, 1986, 57 (08) :677-682

[10]

HEWAT AW, 1973, AERE73239 HARW REP

← 1 2 3 →