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
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
收藏
页码:298 / 304
页数:7
相关论文
共 50 条
  • [31] THERMOELASTIC COEFFICIENTS OF ALPHA-QUARTZ
    KOSINSKI, JA
    GUALTIERI, JG
    BALLATO, A
    IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, 1992, 39 (04) : 502 - 507
  • [32] PHOTOELASTIC DISPERSION OF ALPHA-QUARTZ
    RAO, KV
    NARASIMH.TS
    INDIAN JOURNAL OF PURE & APPLIED PHYSICS, 1971, 9 (10) : 844 - &
  • [33] Negative thermal expansion in beta-quartz
    Welche, PRL
    Heine, V
    Dove, MT
    PHYSICS AND CHEMISTRY OF MINERALS, 1998, 26 (01) : 63 - 77
  • [34] ORIGIN OF PIEZOELECTRICITY IN AN ALPHA-QUARTZ
    KARASAWA, S
    JAPANESE JOURNAL OF APPLIED PHYSICS, 1974, 13 (05) : 799 - 803
  • [35] RENNINGER EFFECT IN ALPHA-QUARTZ
    FOFANOV, AD
    FOTCHENKOV, AA
    SHIVRIN, ON
    DOKLADY AKADEMII NAUK SSSR, 1979, 247 (03): : 606 - 608
  • [36] FERROBIELASTIC HYSTERESIS IN ALPHA-QUARTZ
    BERTAGNOLLI, E
    KITTINGER, E
    TICHY, J
    JOURNAL OF APPLIED PHYSICS, 1979, 50 (10) : 6267 - 6271
  • [37] ELECTROELASTIC EFFECT IN ALPHA-QUARTZ
    REIDER, GA
    KITTINGER, E
    TICHY, J
    JOURNAL OF APPLIED PHYSICS, 1982, 53 (12) : 8716 - 8721
  • [38] HERTZIAN FRACTURE OF ALPHA-QUARTZ
    CHEN, Y
    SARGENT, G
    CONRAD, H
    JOURNAL OF METALS, 1979, 31 (08): : F8 - F8
  • [39] BIRADICAL CENTER IN ALPHA-QUARTZ
    ISOYA, J
    TENNANT, WC
    UCHIDA, Y
    WEIL, JA
    JOURNAL OF MAGNETIC RESONANCE, 1982, 49 (03) : 489 - 497
  • [40] CATHODOLUMINESCENCE COLORS OF ALPHA-QUARTZ
    RAMSEYER, K
    BAUMANN, J
    MATTER, A
    MULLIS, J
    MINERALOGICAL MAGAZINE, 1988, 52 (368) : 669 - 677