Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 41: Issue 4
Synthesis of calcium metaniobate by thermal decomposition of a coprecipitation product
Authors:
L. Marta Technical University of Cluj-Napoca Chemistry Laboratory, Department of Materials Science Cluj-Napoca

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,
M. Zaharescu Roumanian Academy Institute of Physical Chemistry Bucharest

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, and
I. Haiduc Babes-Bolyai University Chemistry Department Cluj-Napoca Roumania

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Pages:
915–924
Online Publication Date:
09 Jan 2007
Publication Date:
01 Apr 1994
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf02547171
Keywords:
calcium metaniobate; DTA mechanism of thermal decomposition; synthesis; X-ray powder diagrams
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Abstract  

The paper presents a new, nonconventional method, based upon coprecipitation, for the synthesis of niobium oxidic compounds. The coprecipitation product of niobic acid with calcium oxalate was used as precursor. Calcium metaniobate was obtained by appropriate thermal treatment of the coprecipitate. The coprecipitation mechanism was studied and the optimal conditions for quantitative precipitation of niobium and calcium were established. The mechanism of thermal decomposition of the coprecipitate was investigated by means of differential thermal analysis and X-ray powder diagrams. The final product of thermal decomposition, calcium metaniobate, is formed at 730°C.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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