High-Pressure Synthesis and Magnetic and Electrical Properties of Fe-Doped Bi 3 Re 3 O 11 and Bi 3 Os 3 O 11 .

Under high-pressure and high-temperature conditions, doped Bi 3 Re 3 O 11 and Bi 3 Os 3 O 11 with Fe up to 29 atomic % were synthesized. The crystal structures and chemical compositions of Bi 3 Os 2.45 Fe 0.55 O 11 and Bi 3 Re 2.13 Fe 0.87 O 11 were determined by synchrotron powder X-ray diffraction and electron probe microanalysis. Both crystal structures were explained by a KSbO 3 -type model with the space group Pn 3̅. Magnetic and electronic transport property measurements showed that Bi 3 Os 2.45 Fe 0.55 O 11 exhibited a ferrimagnetic transition at the highest magnetic ordering temperature of 490 K in the KSbO 3 -type, while Bi 3 Re 2.13 Fe 0.87 O 11 exhibited a spin glassy behavior below 22 K. The magnetoresistance at 5 K and 90 kOe was almost zero for Bi 3 Os 2.45 Fe 0.55 O 11 , but -10% for Bi 3 Re 2.13 Fe 0.87 O 11 . These results suggest that KSbO 3 - type 5d oxides, which exhibit only weak temperature-dependent paramagnetism to date, are a group of compounds that can be converted into spintronic materials by doping with 3d elements, leading to the development of new KSbO 3 -type materials with both theoretical and practical significance.