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Order–disorder processes in adamantine ternary ordered-vacancy compounds

Authors

  • F. J. Manjón,

    Corresponding author
    • Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team, Universitat Politècnica de Valencia, València, Spain
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  • O. Gomis,

    1. Centro de Tecnologías Físicas: Acústica, Materiales y Astrofísica, MALTA Consolider Team, Universitat Politècnica de València, València, Spain
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  • R. Vilaplana,

    1. Centro de Tecnologías Físicas: Acústica, Materiales y Astrofísica, MALTA Consolider Team, Universitat Politècnica de València, València, Spain
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  • J. A. Sans,

    1. Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team, Universitat Politècnica de Valencia, València, Spain
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  • H. M. Ortiz

    1. Instituto de Diseño para la Fabricación y Producción Automatizada, MALTA Consolider Team, Universitat Politècnica de Valencia, València, Spain
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    • On leave from CINVESTAV, Departamento de Nanociencia y Nanotecnología (Zacatenco, México D.F.), Unidad de Querétaro, Querétaro, México.

Corresponding author: e-mail fjmanjon@fis.upv.es, Phone: +34 963 877 000 ext. 75287, Fax: +34 963 877 709

Abstract

Adamantine ternary ordered-vacancy compounds (OVCs) of the AB2X4 family derive from the zincblende structure of binary AX compounds and share many properties with the chalcopyrite-type ternary ABX2 compounds. AB2X4 mainly crystallize in the defect chalcopyrite (or thiogallate) structure but also in other vacancy-ordered phases, like the defect stannite (DS, or defect famatinite) and the pseudocubic (PC) structures, where vacancies occupy a fixed Wyckoff site in an ordered and stoichiometric fashion. Order–disorder phase transitions have been studied in several adamantine OVCs at high temperatures and/or pressures, where OVCs undergo a phase transition to a disordered zincblende (DZ) structure on increasing temperature and to a disordered rocksalt (DR) structure on increasing pressure. It has been suggested that these order–disorder transitions should undergo via intermediate phases of partial disorder between the fully ordered phases and the fully disordered phases. In this work we study the different possible intermediate phases of partial disorder and discuss the possibility to find them with the help of vibrational spectroscopies, like Raman scattering or infrared measurements.

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