Phase transitions in strontium perovskites. Studies of SrOsO3 compared to other 4d and 5d perovksites

作者：Kennedy Brendan J^*; Avdeev Maxim; Feng Hai L; Yamaura Kazunari

来源：Journal of Solid State Chemistry, 2016, 237: 27-31.

DOI：10.1016/j.jssc.2016.01.013

• SrOsO3
• Perovskite
• Phase transition
• Neutron diffraction

The structure of a polycrystalline sample of SrOsO3 has been investigated using powder neutron diffraction from 5 to 300 K, and powder synchrotron X-ray diffraction from 80 to 870 K. At low temperatures SrOsO3 is orthorhombic in Pbnm and heating results in a sequence of phase transition transitions Pbnm -> Imma -> I4/mcm -> Pm (3) over barm. This behavior is compared to that of other Sr containing perovskites. Comparison of the transition temperatures in SrBO3 perovskites shows that the tolerance factor alone does not determine the temperature at which the cubic phase is stabilized but rather the electronic configuration of the B-site cation appears to be significant.

• 出版日期2016-5