抄録
A series of mixed metal oxides with perovskite-type structure, A2(FeMo)O6−λ (where A=Ba, Sr and Ca), were synthesized. The ferrimagnetic Néel temperatures of Ba2(FeMo)O6, Sr2(FeMo)O6 and Ca2(FeMo)O6, were respectively found to be 351°K, 450°K and 398°K, with the saturation moments of 3.6∼3.2 μB. The Mössbauer absorption spectra of Fe57 in Sr2(FeMo)O6 and Ca2(FeMo)O6 were measured at room temperature. They have the isomer shift of 0.27 mm/sec and 0.35 mm/sec relative to that of Pd(Co57) and the values of internal magnetic field at 0°K were deduced to be −570 kOe and −490 kOe, respectively. From the measurements of electrical conductivity and infra-red transmission spectra, all of these compounds A2(FeMo)O6 were found to be highly conductive (ρ\simeq10−1∼10−3ohm·cm) and their temperature dependence is characteristic of metallic conduction.
