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We have investigated the structural and magnetic properties of FeTiTaO6. From the Rietveid-refined XRD patterns of FeTiTaO6, its crystal structure at room temperature is determined to be the rutile structure with lattice constants of α0 = 4.65 Å, and c0 = 3.02 Å. The c/a ratio of 0.649 is almost same as the value in the parent rutile TiO2, which is 0.644. Based on the temperature dependence of the susceptibility between 3 and 400 K, measured with superconducting quantum interference device (SQUID), the magnetic Neel temperature (TN), which is defined as temperature of the maximum slope in dM/dT, is determined to be 40 K. The detailed studies of the local structure have been carried out with 57Co Mossbauer spectroscopy at various temperatures. The Mossbauer spectra of FeTiTaO6 were composed of two six-line hyperfine patterns below 40 K. Also, the magnetic hyperfine field of FeTiTaO6 is found to be 472 kOe at 4.2 K. The Mossbauer spectra clearly reveal the presence of the magnetic ordering below 40 K in FeTiTaO6.
Date of Publication: April 2012