The equilibrium crystal shape of strontium titanate: Impact of donor doping

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• 作者：Wolfgang Rheinheimer ; ^{wolfgang.rheinheimer@kit.edu" class="auth_mail" title="E-mail the corresponding author} ; Fabian J. Altermann ; Michael J. Hoffmann
• 关键词：Equilibrium crystal shape ; Anisotropy ; Surface energy ; Strontium titanate ; Point defects
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：127
• 期：Complete
• 页码：118-121
• 全文大小：823 K

文摘

The present study investigates the impact of point defect concentrations on the equilibrium crystal shape of strontium titanate. Therefore the shape of intergranular pores in coarse microstructures was observed. The point defect concentration was changed by donor-doping with Niobium (0.2 at.%–2.4 at.%). A decreasing surface energy anisotropy was found with increasing donor dopant concentration and with increasing temperature. These findings are correlated to the defect chemistry and grain growth behavior of strontium titanate.