pH值对微波水热法制备MnWO4微晶形貌的影响-IngentaConnect.PDF

40 9 Ag/DyBa Cu O 1327 2 3 7–δ 4040 99 Vol. 40Vol. 40 No. 9No. 9 22 00 11 22 99 JOURNAL OF THE CHINESE CERAMIC SOCIETYJOURNAL OF THE CHINESE CERAMIC SOCIETY SeptemberSeptembe pH MnWO4 ( 710021) (MnCl 4H O)(Na WO 2H O)pH MnWO X 2 · 2 2 4 · 2 4 MnWO4 pH 4.011.0 MnWO4 pH TQ137.1+2 A 0454–5648(2012)09–1327–04 2012–08–21 15:42:49 /kcms/detail/11.2310.TQ1542.201209.1327_014.html Effect of pH Value on Morphology of MnWO Microcrystallites Prepared by 4 Microwave Hydrothermal Method ZHOU SenHUANG Jianfeng CAO LiyunZHANG TingFEI Jie (Key Laboratory of Auxiliary Chemistry Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science Technology, Xi’an 710021, China) Abstract: MnWO4 microcrystallites were prepared by a microwave hydrothermal method at different pH values using MnCl2 ·4H2O and Na2WO4 ·2H2O as the start materials. The phase and morphology of the as-prepared samples were characterized by X-ray diffrac- tion and transmission electron microscopy. The formation mechanism of rod-like MnWO4 was proposed. The results showed that pure MnWO4 microcrystallites could be prepared in the pH value range of 4.0–11.0, and the crystallinity and grain size of products in- creased with increasing of the pH value. Correspondingly, the morphology transformed from grain-like to rod-like. Key words: microwave hydrothermal method; manganese tungsten; microcrystallites [1]