Key Laboratory of Materials Physics;
Institute of Solid State Physics;
HFIPS;
Chinese Academy of Sciences;
Hefei 230031;
China;
University of Science and Technology of China;
Hefei 230026;
China;
Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions;
High Magnetic Field Laboratory;
HFIPS;
Chinese Academy of Sciences;
Hefei 230031;
China;
Spallation Neutron Source Science Center;
Dongguan 523803;
China;
Department of Chemistry;
University of Warsaw;
02093 Warsaw;
Poland;
National Synchrotron Radiation Laboratory;
University of Science and Technology of China;
Hefei 230029;
China;
Negative thermal expansion; XANES; Oxygen vacancy; Oxide; Lattice distortion; Phase transition;