Thermal decomposition of rare-earth-doped calcium oxalate .1. Doping with lanthanum, samarium and gadolinium

被引:7
作者
Patnaik, U [1 ]
Muralidhar, J [1 ]
机构
[1] REG RES LAB,CPAF DIV,BHUBANESWAR 751013,ORISSA,INDIA
关键词
decomposition; doping; gadolinium; lanthanum; samarium;
D O I
10.1016/0040-6031(95)02394-1
中图分类号
O414.1 [热力学];
学科分类号
摘要
The thermal decomposition of calcium oxalate doped with lanthanum, samarium or gadolinium has been investigated using thermogravimetry (TG) and differential thermal analysis (DTA). The kinetics of the decomposition steps have been studied by the non-isothermal TG technique. The doped oxalates decompose in a similar way to pure CaOx. After dehydration, decomposition of doped oxalates proceeds in two overlapping exothermic stages, i.e. decomposition of lanthanide oxalates followed by that of calcium oxalate. Samples heated up to 1000 degrees C reveal the existence of CaO and Ln(2)O(3) in separate phases.
引用
收藏
页码:261 / 272
页数:12
相关论文
共 18 条
[1]  
Aboltina I., 1993, Ferroelectrics, V141, P277, DOI 10.1080/00150199308223455
[2]  
BAGNALL KW, 1972, INORG CHEM SERIES 1, V1, P78
[3]   KINETIC PARAMETERS FROM THERMOGRAVIMETRIC DATA [J].
COATS, AW ;
REDFERN, JP .
NATURE, 1964, 201 (491) :68-&
[4]  
Dollimore D., 1970, J THERM ANAL, V2, P229
[5]   THERMAL-DECOMPOSITION OF CERIUM OXALATE AND MIXED CERIUM-GADOLINIUM OXALATES [J].
ELHOUTE, S ;
ALI, ME .
JOURNAL OF THERMAL ANALYSIS, 1991, 37 (05) :907-913
[6]   THERMAL-ANALYSIS OF THE OXALATE HEXAHYDRATES AND DECAHYDRATES OF YTTRIUM AND THE LANTHANIDE ELEMENTS [J].
FULLER, MJ ;
PINKSTONE, J .
JOURNAL OF THE LESS-COMMON METALS, 1980, 70 (02) :127-142
[7]   THERMAL DECOMPOSITION OF THE LIGHT RARE EARTH OXALATES [J].
GLASNER, A ;
STEINBERG, M .
JOURNAL OF INORGANIC & NUCLEAR CHEMISTRY, 1961, 22 (1-2) :39-48
[8]   ALKALINE-EARTH CU(II) OXALATE COMPOUNDS AS PRECURSORS OF MCUO2 (M = CA, SR, BA) OXIDES - THERMAL AND SPECTROSCOPIC STUDY [J].
INSAUSTI, M ;
CORTES, R ;
ARRIORTUA, MI ;
ROJO, T ;
BOCANEGRA, EH .
SOLID STATE IONICS, 1993, 63-5 :351-357
[9]  
PRIBIL R, 1972, ANAL APPL EDTA RELAT, V52, P165
[10]  
PURUKAYASTHA BC, 1959, J INORG NUCL CHEM, V10, P103