Forced convection by Inclined Rotary Bridgman method for growth of CoSb3 and FeSb2 single crystals from Sb-rich solutions

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Pillaca, M
Harder, O
Miller, W
Gille, P
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Elsevier B.V.
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Sb-based compounds such as CoSb3 and FeSb2 are interesting materials for thermoelectric applications. Their single crystal growth can be achieved from high-temperature solutions that are strongly enriched in Sb. In Bridgman growth using closed ampoules, effective mixing of the solution is an important prerequisite in order to minimize the high risk of liquid inclusion formation. We have successfully grown inclusion-free single crystal of CoSb3 and FeSb2 by rotating the ampoule in a Bridgman-type crystal growth set-up being inclined by 75° with respect to the vector of gravity. Numerical modelling as well as experimental growth studies have demonstrated the strong influence of forced convection that is achieved by this modified directional solidification technique called Inclined Rotary Bridgman method.
The authors are grateful to the former LMU students Tamara Maletin and Viviane Cocivera for their valuable contributions in the preliminary experiments to this study, to Stefanie Hoser for surface polishing of the samples and to SoHyun Park for her assistance in Rietveld refinement. This work has been partly conducted within the European integrated Center for the development of new Metallic Alloys and Compounds. M.P. is grateful for funding by the Peruvian Council of Science and Technology (CONCYTEC), grant no. 221-2014-FONDECYT.
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Thermoelectrics, A1. Phase diagramsA2, Bridgman methodA2, Growth from high-temperature solutionsB1, Intermetallic compoundsB2