Abstract
Two novel solid solution series, Ba2-xLaxInIrO6 (x=0–1.0) and BaLaIn1-yCayIrO6 (y=0–1.0), were prepared and several changes in structure, moment and charge transport were observed. The Ba2-xLaxInIrO6 series exhibits a transition from a 6M polytype to an orthorhombic perovskite structure with increased La content whereas the BaLaIn1-yCayIrO6 series transitioned from a disordered, orthorhombic perovskite to an ordered, cubic perovskite with increased Ca content. Seebeck measurements for both systems showed that Ir(IV)-rich compounds tended to have a n-type conduction mechanism while Ir(V)-rich compounds tended to be p-type. Both systems were found to be semiconducting and the magnitude of the resistivity is dependent on crystal structure and Ir environment. Magnetic measurements show that the μeff values for both systems are significantly less than predicted for Ir(IV) (1.73 μB) and greater than predicted for Ir(V) (0 μB). These results are compared to other iridate compound families.
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