Sol–Gel Synthesis of Strontium Pyroniobate and Calcium Pyroniobate |
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| Authors: | Alamanda V. Prasadarao Ulagaraj Selvaraj Sridhar Komarneni Amar S. Bhalla |
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| Affiliation: | Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802 |
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| Abstract: | Strontium and calcium pyroniobates were prepared by a sol–gel process, using strontium/calcium metal and niobium ethoxide as precursors. The formation of Sr2Nb2O7 occurred at 750°C via an intermediate perovskite phase of composition close to Sr0.82NbO3. The crystallization of Ca2Nb2O7 occurred at 600°C directly without any intermediate phases. Sintered Sr2Nb2O7 and Ca2Nb2O7 pellets showed a preferred grain orientation. Microstructural studies revealed an increase in grain growth and associated orientation with sintering temperature. |
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