Тип публикации: статья из журнала
Год издания: 2017
Идентификатор DOI: 10.1016/j.jcrysgro.2017.06.026
Ключевые слова: A1. Crystal structure, A1. Low dimensional structures, A2. Single crystal growth, B1. Borates, B2. Magnetic materials
Аннотация: Single crystalline Mn2-xFexBO4 with x = 0.3, 0.5, 0.7 grown by the flux method have been studied by means of X-ray diffraction and X-ray absorption spectroscopy at both Mn and Fe K edges. The compounds were found to crystallize in an orthorhombic warwickite structure (sp. gr. Pnam). The lattice parameters change linearly with x thuПоказать полностьюs obeying the Vegard's law. The Fe3+ substitution for Mn3+ has been deduced from the X-ray absorption near-edge structure (XANES) spectra. Two energy positions of the absorption edges have been observed in Mn K-edge XANES spectra indicating the presence of manganese in two different oxidation states. Extended X-ray absorption fine structure (EXAFS) analysis has shown the reduction of local structural distortions upon Fe substitution. The magnetization data have revealed a spin-glass transition at TSG = 11, 14 and 18 K for x = 0.3, 0.5 and 0.7, respectively.
Журнал: Journal of Crystal Growth
Выпуск журнала: Т. 475
Номера страниц: 239-246
ISSN журнала: 00220248
Издатель: Elsevier Science Publishing Company, Inc.