Authors:
A. de OliveiraUFPB Depto de Química, Laboratório de Combustíveis e Materiais João Pessoa PB Brazil

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J. Ferreira

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Márcia SilvaUFPB Depto de Química, Laboratório de Combustíveis e Materiais João Pessoa PB Brazil

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Soraia de SouzaUFPB Depto de Química, Laboratório de Combustíveis e Materiais João Pessoa PB Brazil

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F. VieiraUFPB Depto de Química, Laboratório de Combustíveis e Materiais João Pessoa PB Brazil

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E. LongoUNESP CMDMC, Centro Multidisciplinar de Desenvolvimento de Materiais Cerâmicos Araraquara SP Brazil

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A. SouzaUFPB Depto de Química, Laboratório de Combustíveis e Materiais João Pessoa PB Brazil

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Iêda SantosUFPB Depto de Química, Laboratório de Combustíveis e Materiais João Pessoa PB Brazil

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Abstract  

NiWO4 and ZnWO4 were synthesized by the polymeric precursor method at low temperatures with zinc or nickel carbonate as secondary phase. The materials were characterized by thermal analysis (TG/DTA), infrared spectroscopy, UV–Vis spectroscopy and X-ray diffraction. NiWO4 was crystalline after calcination at 350 °C/12 h while ZnWO4 only crystallized after calcination at 400 °C for 2 h. Thermal decomposition of the powder precursor of NiWO4 heat treated for 12 h had one exothermic transition, while the precursor heat treated for 24 h had one more step between 600 and 800 °C with a small mass gain. Powder precursor of ZnWO4 presented three exothermic transitions, with peak temperatures and mass losses higher than NiWO4 has indicating that nickel made carbon elimination easier.

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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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