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Citation: Liu Shi-Jun, Chen Qi-Yuan, Zhang Ping-Min, Liu Min-Na. Study on Thermal Decomposition of Sodium Paratungstate Na₁₀H₂W₁₂O₄₂·27H₂O[J]. Acta Physico-Chimica Sinica, ;1998, 14(09): 821-825. doi: 10.3866/PKU.WHXB19980911 shu

Study on Thermal Decomposition of Sodium Paratungstate Na₁₀H₂W₁₂O₄₂·27H₂O

1.
Department of Chemistry,Certral South University of Technology,Changsha 410083

Received Date: 1 December 1997
Available Online: 15 September 1998

In this paper, the preparation of sodium paratungstate Na10H2W12O42•27H2O(SPTB ) and its characterization by X-ray diffraction, Raman spectrum and chemical analysis have been studied. The thermal decomposition of SPTB has been also studied. The overall mechanism of decomposition involves seven separate stages. The first four stages are dehydration stages, which occur at about 331K, 353K, 403K and 588K respectively, and which correspond to the loss of10H2O, 9H2O, 5H2O and 4H2O respectively. The fifth stage, which occurs at about 691K， is a phase transformation of an intermediate. The sixth stage, which occurs at about 733K, is the formation of the mixture of Na2W2O7 and Na2W4O13.The first five stages are all reversible.
- Sodium paratungstate,
- Thermal decomposition
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Study on Thermal Decomposition of Sodium Paratungstate Na₁₀H₂W₁₂O₄₂·27H₂O