Influence of the thermal treatment in the crystallization of NiWO4 and ZnWO4
NiWO 4 and ZnWO 4 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. NiWO 4 was crystalline after cal...
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Published in | Journal of thermal analysis and calorimetry Vol. 97; no. 1; pp. 167 - 172 |
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Main Authors | , , , , , , , |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
Dordrecht
Springer Netherlands
01.07.2009
Springer |
Subjects | |
Online Access | Get full text |
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Summary: | NiWO
4
and ZnWO
4
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. NiWO
4
was crystalline after calcination at 350 °C/12 h while ZnWO
4
only crystallized after calcination at 400 °C for 2 h. Thermal decomposition of the powder precursor of NiWO
4
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 ZnWO
4
presented three exothermic transitions, with peak temperatures and mass losses higher than NiWO
4
has indicating that nickel made carbon elimination easier. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1388-6150 1588-2926 1572-8943 |
DOI: | 10.1007/s10973-009-0244-8 |