摘要
X-ray diffraction studies of synthesized Ba_(2)TiSi_(2)O_(8) have shown that this compound has a fresnoite structure and is characterized by a polar phase P4bm at room temperature.The synthesis of Pb_(2)TiSi_(2)O_(8) in the fresnoite phase under the selected synthesis conditions has led to the formation of a perovskite tetragonal phase P4mm corresponding to PbTiO_(3).
基金
supported by the Ministry of Science and Higher Education of the Russian Federation(State assignment in the field of scientific activity,Southern Federal University,2020).