"Md Saiduzzaman,Takahiro Takei,Sayaka Yanagida,Nobuhiro Kumada,Hena Das,Hirokazu Kyokane,Shogo Wakazaki,Masaki Azuma,Chikako Moriyoshi,Yoshihiro Kuroiwa","Hydrothermal Synthesis of Pyrochlore-Type Pentavalent Bismuthates Ca<sub>2</sub>Bi<sub>2</sub>O<sub>7</sub> and Sr<sub>2</sub>Bi<sub>2</sub>O<sub>7</sub>",,"Inorganic Chemistry",,"Vol. 58",,"pp. 1759-1763",2019,Jan.