REFINEMENT OF SOME NA0.5-XM'0.5+X/3-SQUARE-2X/3MOO4, M = BI, CE, LA, SCHEELITE STRUCTURES WITH POWDER NEUTRON AND X-RAY-DIFFRACTION DATA

被引:37
作者
TELLER, RG
机构
关键词
D O I
10.1107/S0108270192001434
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Bismuth sodium molybdate, Na0.5Bi0.5-MoO4 (I), M(r) = 275.92, tetragonal, I4(1)/a, a= 5.2717 (1), c = 11.5801 (2) angstrom, V = 321.824 (5) angstrom3, Z = 4, D(n) = 5.69 g cm-3, R(p) = 4.06% (263 reflections, neutron data). Bismuth sodium molybdate, Na0.32-Bi0.56MoO4 (II), M(r) = 284.33, tetragonal, I4(1)/a, a = 5.2785 (1), c = 11.6410 (2) angstrom, V = 324.342 (5) angstrom3, Z = 4, D(n) = 5.82 g cm-3, R(p) = 4.82% (293 reflections, neutron data). Cerium sodium molybdate, Na0.5-Ce0.5MoO4 (III), M(r) = 241.64, tetragonal, I4(1)/a, a = 5.3167 (4), c = 11.6600 (11) angstrom, V = 329.58 (3) angstrom3, Z = 4, D(x) = 4.87 g cm-3, R(p) = 12.34% [105 reflections, X-ray data, Cu Kalpha (1.5415 angstrom) radiation]. Lanthanum sodium molybdate, Na0.5La0.5MoO4 (IV), M(r) = 241.03, tetragonal, I4(1)/a, a = 5.3424 (4), c = 11.7376 (11) angstrom, V = 335.01 (3) angstrom3, Z = 4, D(x)= 4.78 g cm-3, R(p) = 10.82% [107 reflections, X-ray data, Cu Kalpha (1.5415 angstrom) radiation]. The structures have been refined with room-temperature time-of-flight powder neutron diffraction data or X-ray diffraction data as indicated. Results of Rietveld refinements indicate that all of the materials adopt the scheelite (CaWO4) structure, with Na, vacancies and Bi, La or Ce cations randomly distributed on the Ca site, and Mo occupying the W site.
引用
收藏
页码:2101 / 2104
页数:4
相关论文
共 17 条
[1]  
BRAZDIL JF, 1985, ACS SYM SER, V279, P57
[2]   ABSOLUTE INTEGRATED INTENSITY MEASUREMENT - APPLICATION TO CAWO4 AND COMPARISON OF SEVERAL REFINEMENTS [J].
BURBANK, RD .
ACTA CRYSTALLOGRAPHICA, 1965, 18 :88-&
[3]  
COX DE, 1980, NBS SPEC PUBL, V567, P189
[4]   IPNS DISTRIBUTED-PROCESSING DATA ACQUISITION-SYSTEM [J].
HAUMANN, JR ;
DALY, RT ;
WORLTON, TG ;
CRAWFORD, RK .
IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 1982, 29 (01) :62-66
[5]   HIGH-PRESSURE CRYSTAL-CHEMISTRY OF SCHEELITE-TYPE TUNGSTATES AND MOLYBDATES [J].
HAZEN, RM ;
FINGER, LW ;
MARIATHASAN, JWE .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1985, 46 (02) :253-263
[6]  
HOWARD CJ, 1986, AAEC M112 RAEP
[7]  
HUHEEY JE, 1972, INORG CHEM, P74
[8]   CRYSTAL-STRUCTURE OF LA2(MOO4)3, A NEW ORDERED DEFECT SCHEELITE TYPE [J].
JEITSCHKO, W .
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS, 1973, 29 (OCT15) :2074-2081
[9]   COMPREHENSIVE STUDY OF DISORDERED AND ORDERED SCHEELITE-RELATED BI-3(FEO-4)(MOO-4)2 [J].
JEITSCHKO, W ;
SLEIGHT, AW ;
MCCLELLAN, WR ;
WEIHER, JF .
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS, 1976, 32 (APR15) :1163-1170
[10]  
JROGENSEN JD, 1982, 6TH P INT COLL ADV N