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Mechanical properties of highly oriented FeSe0.5Te0.5 superconductor

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Mechanical properties of highly oriented FeSe0.5Te0.5 superconductor

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Título Mechanical properties of highly oriented FeSe0.5Te0.5 superconductor
Autor Pimentel Junior, Jorge Luiz
Pureur Neto, Paulo
Lopes, Cristiano Santos
Serbena, Francisco Carlos
Foerster, Carlos Eugenio
Silva, Simone Aparecida da
Jurelo, Alcione Roberto
Chinelatto, Adilson Luiz
Abstract We have synthesized highly oriented samples of the superconducting compound FeSe0.5Te0.5 and investigated its mechanical properties. These samples were characterized by scanning electron microscopy (SEM) with energy-dispersive analysis, x-ray diffraction, and electrical resistivity. The measured critical temperature is TC~14.5 K. Hardness and elastic modulus on the ab- and a(b)c-plane were obtained by instrumented indentation. The samples’ morphology consists of plate-like crystals with a lamellar structure. Two phases were observed with a typically eutectic microstructure composed by white and gray lamellas when observed with SEM using backscattered electrons. The white phase is richer in Te and poorer in Se than the gray phase. No significant differences in hardness and elastic modulus were observed between ab- and a(b)c-planes. Hardness profiles indicated values in the range 0.6–0.8 GPa at deep tip penetration depths, while the elastic modulus showed values in between 20–25 GPa. Cracking was occasionally observed in the ab-plane and at low loads.
Contido em Journal of applied physics. New York. Vol. 111, no. 3 (Feb. 2012), 033908, 6 p.
Assunto Compostos de ferro
Compostos de selênio
Dureza
Estrutura eutética
Materiais supercondutores
Microscopia eletronica
Módulos elásticos
Resistividade eletrica
Temperatura de transição supercondutora
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/96274
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