Abstract
We present X-ray diffraction patterns, soft Ca, Co, and Fe L2,3 absorption spectra, magnetic susceptibility, and temperature dependent magnetization measurements in order to characterize ABaM4O7 solid solutions A = Y, Ca; M = Co, Fe). Cobalt ions are in 2 + and high-spin 3 + oxidation states. In the iron-doped solid solutions, Fe ions were found to be trivalent. Doping with Fe ions leads to a decreasing amount of Co3+ ions. Magnetic properties of the studied samples showed a spin-glass behavior. Negative values of the Curie–Weiss temperatures indicated the predominance of antiferromagnetic exchange interactions. The freezing point of the magnetic moments is 51 K and does not vary with the amount of Fe doping.
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