ChemInform Abstract: Structure and Properties of Ir‐Containing Oxides with Large Spin—Orbit Coupling: Ba₂In_2‐xIr_xO_5+δ.

Abstract

The title solid solution series with x = 0—1.4, and 2 is synthesized from stoichiometric mixtures of BaCO3, IrO2, and In2O3 (1200 °C, 36 h).

Bi2–xCaxIr2O6+y Pyrochlore Phases: Structure and Properties with Varied Ir Oxidation State from 3.9+ to 4.3+

“…This is highly successful for iridates that can be dissolved. 25 We were unable to dissolve our phases, but the Ir oxidation state can be determined from the refined formula. This would not be a reliable method when using X-ray diffraction data, but the high sensitivity to O in neutron diffraction provides a sufficiently accurate definition of the O′ content.…”

Unusual Coexistence of Nickel(II) and Nickel(IV) in the Quadruple Perovskite Ba4Ni2Ir2O12 Containing Ir2NiO12 Mixed-Metal-Cation Trimers

“…When the high-temperature paramagnetic regime of the 1 T magnetic susceptibility data of Ba 4 Ni 1.94 Ir 2.06 O 12 is fit to the Curie−Weiss law, with a χ 0 term, as shown in Figure S11, an effective magnetic moment of 4.40 μ B is obtained. Given that in Ba 4 Ni 1.94 Ir 2.06 O 12 nickel(II) has two unpaired electrons, that nickel(IV) has a low-spin t 2g 6 electron configuration, and that iridium(V) adopts a nonmagnetic ground state 5,[7][8][9]26,27 due to spin orbit coupling, as shown in Figure S12, we would expect a calculated spin-only moment of 2.83 μ B . This value is significantly lower than the measured value of 4.40 μ B .…”