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Studies of layered uranium (VI) compounds. VI. Ionic conductivities and thermal stabilities of MUO/sub 2/PO/sub 4/. nH/sub 2/O, where M = H, Li, Na, K, NH/sub 4/ or 1/2 Ca, and where n is between 0 and 4

Journal Article · · J. Solid State Chem.; (United States)
; ;
We have measured the ionic conductivities of pressed pellets of the layered compounds MUO/sub 2/PO/sub 4/ . nH/sub 2/O, and correlated the results with TGA data. The conductivities (in ohm/sup -1/m/sup -1/), at temperatures increasing with decreasing water content over the range 20 to 200/sup 0/C, were approximately as follows: Li/sup +/-4H/sub 2/O, 10/sup -4/; Li/sup +/-, Na/sup +/-, K/sup +/-, and NH/sub 4//sup +/-3H/sub 2/O, 10/sup -4/, 10/sup -2/, 10/sup -4/, and 10/sup -4/; H/sup +/-, Li/sup +/-, and Na/sup +/-1.5H/sub 2/O, 10/sup -2/, 10/sup -4/, and 10/sup -4/; Na/sup +/-1H/sub 2/O, 10/sup -5/; H/sup +/-, K/sup +/-, and NH/sub 4//sup +/-0.5H/sub 2/O, all 10/sup -5/; and H/sup +/-, Li/sup +/-, Na/sup +/-, K/sup +/-, NH/sub 4//sup +/-, and 1/2Ca/sup 2 +/-OH/sub 2/O, 10/sup -5/, 10/sup -5/, 10/sup -4/, 10/sup -5/, 10/sup -5/, and 10/sup -6/. A ring mechanism is proposed to account for the high conductivity found in NaUO/sub 2/PO/sub 4/.3.1H/sub 2/O. The accurate TGA data showed that most of the hydrates had water vacancies of the Schottky type, and should be represented as MUO/sub 2/PO/sub 4/(A-x)H/sub 2/O, where x can be between 0 and 0.3.
Research Organization:
Univ. of Leeds, England
OSTI ID:
6591560
Journal Information:
J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 37:1; ISSN JSSCB
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AMMONIUM COMPOUNDS
AMMONIUM PHOSPHATES
CALCIUM COMPOUNDS
CALCIUM PHOSPHATES
CHEMICAL ANALYSIS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GRAVIMETRIC ANALYSIS
HYDRATES
IONIC CONDUCTIVITY
LITHIUM COMPOUNDS
LITHIUM PHOSPHATES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM PHOSPHATES
QUANTITATIVE CHEMICAL ANALYSIS
SODIUM COMPOUNDS
SODIUM PHOSPHATES
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
URANIUM COMPOUNDS
URANYL COMPOUNDS
URANYL PHOSPHATES