Formation of SrTiOub class="a-plus-plus">3 ub> in mechanically activated SrCOub class="a-plus-plus">3 ub>–TiOub class="a-plus-plus">2 ub> system
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- 作者：Tuğba Tunç Parlak ; Fatih Apaydin…
- 关键词：Mechanical activation ; Stress energy ; Strontium titanate
- 刊名：Journal of Thermal Analysis and Calorimetry
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：127
- 期：1
- 页码：63-69
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation;
- 出版者：Springer Netherlands
- ISSN：1588-2926
- 卷排序：127
文摘
In this study, mechanical activation process was used for intimate mixing as well as producing finely ground particles, increased surface area and improved chemical reactivity of milled materials for producing SrTiOub>3 ub> from commercially pure strontium carbonate and TiOub>2 ub> as a contributive process. Characterization of milled powder mixture by X-ray diffraction analysis showed that disappearing, decreasing and/or shifting of the patterns occurred with mechanical activation that means amorphization was taken place. Amorphization was also demonstrated by FT-IR analysis where shift of band centers as well as the decrement of transmittance related to COub>3 ub> was observed. Advantage of amorphization was established with high-temperature XRD analysis which showed 1300 °C was not enough for non-activated mixture to form SrTiOub>3 ub>, whereas structure only composed of SrTiOub>3 ub> at 1000 °C for activated ones. The reason for this phenomenon was investigated by DTA-TG analysis, and it was based on energy accumulation originated from mechanical activation that corresponds to peak temperature shifting to the lower temperatures and COub>2 ub> liberation at mechanical activation step arising from local temperature rising at the vial during high-energy milling that was understood from peak temperature, and area decrement of endothermic peak corresponds to decomposition of SrCOub>3 ub>.