Crystal Structure of Cerium Tantalum Nitride Perovskite
ABN3 nitride perovskites are rarely reported. We propose to study the structure of bulk-phase nitride perovskite CeTaN3¿x, which we prepared with a high-pressure reaction.The laboratory X-ray powder pattern can reasonably be fit with a cubic model (SG Pm3 ¿m, a = 4.009423 Å) but peak broadening on several reflections, e.g. <200>, <211>, suggest a structural distortion. We have measured the magnetic susceptibility of the as prepared CeTaN3¿x, showing Curie-Weiss behaviour with an effective magnetic moment of 1.7 µB. The observed moment corresponds to a composition CeTaN3¿x with 0.15 < x < 0.17. Powder neutron diffraction (PND) is required to investigate the octahedral tilt structure and to determine the nitrogen positions as well as occupancies in CeTaN3¿x due to the high sensitivity of neutron for nitrogen. The D20 beamline of the ILL is optimal as the high neutron flux enables data collection from a small sample ~100 mg obtained from high-pressure experiments. Low temperature data will also help to decorrelate N-occupancies and thermal factors.
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J. Paul Attfiel;d; KLOSS Simon; RITTER Clemens and YUAN Yao. (2023). Crystal Structure of Cerium Tantalum Nitride Perovskite. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-21-1184
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