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Study on phase transition of SrTiO 3 by in situ impedance measurement under high pressure
Author(s) -
Wang Qinglin,
Yang Jie,
Liu Bao,
Liu Cailong,
Hu Tingjing,
Li Yan,
Su Ningning,
Sang Dandan,
Han Yonghao,
Gao Chunxiao
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201000618
Subject(s) - tetragonal crystal system , orthorhombic crystal system , phase transition , materials science , diffraction , phase (matter) , perovskite (structure) , diamond anvil cell , condensed matter physics , analytical chemistry (journal) , x ray crystallography , in situ , crystallography , crystal structure , chemistry , optics , physics , organic chemistry , chromatography
The pressure dependence of electrical resistance of perovskite SrTiO 3 has been studied by in situ impedance measurement in diamond anvil cell up to 31 GPa at room temperature. Two discontinuous changes in resistance were observed at about 9.8 and 21 GPa, which are coincident with the pressure‐induced phase transitions from cubic phase to tetragonal phase and then to orthorhombic phase, respectively. High‐pressure angle dispersive X‐ray diffraction experiments on SrTiO 3 powders have also been performed up to 35 GPa. It was found that a structure phase transition from cubic to tetragonal phase begins to take place at about 6.49 GPa but clear indication for a further transition to an orthorhombic phase at higher pressure up to 35 GPa is hardly seen in our X‐ray diffraction data.