COMPOUNDS IN CERIUM TETRAFLUORIDE-AMMONIUM FLUORIDE-WATER SYSTEM

被引:11
作者
PENNEMAN, RA
ROSENZWE.A
机构
[1] Los Alamos Scientific Laboratory, University of California, Los Alamos, New Mexico
关键词
D O I
10.1021/ic50073a043
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
In the CeF4-NH4F-H2O system, (NH4)4CeF8 is the solid phase in equilibrium at 25° with NH4F solutions over the concentration range 28.9-45 wt % NH4F (saturated solution). It is monoclinic, C2/c, a = 13.02, b = 6.66, c = 13.61 Å, β = 121° 18’, Z = 4, and is isostructural with (NH4)4UF8. Thermogravimetric analysis and differential thermal analysis establish that (NH4)4CeF8 decomposes to (NH4)2CeFe6 without indication of a transition to an anhydrous compound of stoichiometry (NH4)3CeF7. However, the monohydrate (NH4)3CeF7∙H2O can be obtained from ˜28 wt % NH4F solutions. It is monoclinic, P21/n, a = 11.09, b = 12.10, c = 7.13 Å, β = 95° 55’, Z = 4. (NH4)2CeF6 is orthorhombic and isostructural with α-(NH4)2UF6. 7NH4F-6CeF4 is rhombohedral, a = 9.50 Å, α = 106° 42’, and is obtained from 1% NH4F solution. NH4CeF5 is formed from 7NH4F∙6CeF4 on thermal decomposition and is isostructural with β-NH4UF,5. © 1969, American Chemical Society. All rights reserved.
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相关论文
共 10 条
[1]   PREPARATION AND PROPERTIES OF SEVERAL AMMONIUM URANIUM(IV) AND AMMONIUM PLUTONIUM(IV) FLUORIDES [J].
BENZ, R ;
DOUGLASS, RM ;
KRUSE, FH ;
PENNEMAN, RA .
INORGANIC CHEMISTRY, 1963, 2 (04) :799-&
[2]  
BESSE JP, 1966, B SOC CHIM FR, P577
[3]  
BRUNTON GD, 1965, ORNL3761 REP
[4]   CRYSTAL STRUCTURE OF NA7ZR6F31 [J].
BURNS, JH ;
ELLISON, RD ;
LEVY, HA .
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL CRYSTALLOGRAPHY AND CRYSTAL CHEMISTRY, 1968, B 24 :230-&
[5]  
McMurdie H. F, 1964, PHASE DIAGRAMS CERAM
[6]   STUDIES OF AMMONIUM FLUORIDE-URANIUM TETRAFLUORIDE-WATER SYSTEM . PROPERTIES OF (NH4)4UF8, )NH4)2UF6, 7NH4F.6UF4, + OF U)4) IN AQUEOUS NH4F [J].
PENNEMAN, RA ;
GEORGE, RS ;
KRUSE, FH ;
COLEMAN, JS .
INORGANIC CHEMISTRY, 1964, 3 (03) :309-&
[8]  
ROSENZWEIG A, IN PRESS
[9]   CRYSTAL STRUCTURE OF AMMONIUM HEXAFLUOROCERATE(4) (NH4)2CEF6 [J].
RYAN, RR ;
LARSON, AC ;
KRUSE, FH .
INORGANIC CHEMISTRY, 1969, 8 (01) :33-&
[10]   DOUBLE FLUORIDES OF POTASSIUM OR SODIUM WITH URANIUM, THORIUM OR LANTHANUM [J].
ZACHARIASEN, WH .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1948, 70 (06) :2147-2151