Effects of firing temperature on morphology and crystal structure of zirconiumbis(monohydrogen phosphate) and its alkali salts |
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Authors: | Y. Sadaoka M. Matsuguchi Y. Sakai S. Mitsui M. Toita K. Hatanaka |
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Affiliation: | (1) Department of Industrial Chemistry, Faculty of Engineering, Ehime University, 790 Matsuyama, Japan |
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Abstract: | In zirconiumbis(monohydrogen phosphate)monohydrate, the stability of water of crystallization and of the crystal form was strongly influenced by its crystal size. The water of crystallization of a smaller crystal was completely released on heating to 200° C while a part of this water was held at 300° C in a larger crystal with a diameter of several micrometres. While a smaller crystal was decomposed by heating to 900° C and cubic zirconium pyrophosphate was formed, for a larger crystal,-layered zirconium pyrophosphate was formed instead of cubic zirconium pyrophosphate and a layered structure was held. For the Na2-, K2- and Rb2-forms, good layer structure was retained even by heating to 1000° C. For the Li2-form, the layer structure was decomposed on heating at or above 900° C. The thermal stability of the layered structure increased with increasing crystal size and ionic radii of the alkali cation. |
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