Thermal decomposition behavior of the rare-earth ammonium sulfate R{sub 2}(SO{sub 4}){sub 3}.(NH{sub 4}){sub 2}SO{sub 4}

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.04.038· OSTI ID:21483658

Nagai, Tsukasa ^[1]; Tamura, Shinji ^[1]; Imanaka, Nobuhito ^[1]

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1. Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)

Rare-earth ammonium sulfate octahydrates of R{sub 2}(SO{sub 4}){sub 3}.(NH{sub 4}){sub 2}SO{sub 4}.8H{sub 2}O (R=Pr, Nd, Sm, and Eu) were synthesized by a wet process, and the stable temperature region for the anhydrous R{sub 2}(SO{sub 4}){sub 3}.(NH{sub 4}){sub 2}SO{sub 4} form was clarified by thermogravimetry/differential thermal analysis, infrared, Raman, and electrical conductivity measurements. Detailed characterization of these double salts demonstrated that the thermal stability of anhydrous R{sub 2}(SO{sub 4}){sub 3}.(NH{sub 4}){sub 2}SO{sub 4} is different between the Pr, Nd salts and the Sm, Eu salts, and the thermal decomposition behavior of these salts was quite different from the previous reports. - Graphical abstract: Stable temperature range of anhydrous rare-earth ammonium sulfate R{sub 2}(SO{sub 4}){sub 3}.(NH{sub 4}){sub 2}SO{sub 4} was clarified by thermogravimetry/differential thermal analysis, infrared, Raman, and electrical conductivity measurements. Since the previous reports were based only on thermal analysis, the present work has more accurately determined the exact thermal stability of rare-earth ammonium sulfate solids.

• OSTI ID: 21483658
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 7; Other Information: DOI: 10.1016/j.jssc.2010.04.038; PII: S0022-4596(10)00185-4; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMMONIUM SULFATES
DIFFERENTIAL THERMAL ANALYSIS
ELECTRIC CONDUCTIVITY
EUROPIUM COMPOUNDS
NEODYMIUM COMPOUNDS
PRASEODYMIUM COMPOUNDS
PYROLYSIS
SAMARIUM COMPOUNDS
STABILITY
THERMAL GRAVIMETRIC ANALYSIS
AMMONIUM COMPOUNDS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DECOMPOSITION
ELECTRICAL PROPERTIES
GRAVIMETRIC ANALYSIS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
SULFATES
SULFUR COMPOUNDS
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES