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A new oxide, sodium-iron antimonate, NaFeSbO, was synthesized and structurally characterized, and its static and dynamic magnetic properties were comprehensively studied both experimentally by and magnetic susceptibility, magnetization, specific heat, electron spin resonance (ESR) and Mössbauer measurements, and theoretically by density functional calculations. The resulting single-crystal structure ( = 15.6991(9) Å; = 5.3323 (4) Å; = 10.8875(6) Å; S.G. ) consists of edge-shared SbO octahedral chains, which alternate with vertex-linked, magnetically active FeO tetrahedral chains. The Fe Mössbauer spectra confirmed the presence of high-spin Fe (3d) ions in a distorted tetrahedral oxygen coordination. The magnetic susceptibility and specific heat data show the absence of a long-range magnetic ordering in NaFeSbO down to 2 K, but magnetic susceptibility unambigously demonstrates spin-glass-type behavior with a unique two-step freezing at ≈ 80 K and ≈ 35 K. Magnetic hyperfine splitting of Fe Mössbauer spectra was observed below * ≈ 104 K ( < *). The spectra just below * ( < < *) exhibit a relaxation behavior caused by critical spin fluctuations, indicating the existence of short-range correlations. The stochastic model of ionic spin relaxation was used to account for the shape of the Mössbauer spectra below the freezing temperature. A complex slow dynamics is further supported by ESR data revealing two different absorption modes presumably related to ordered and disordered segments of spin chains. The data imply a spin-cluster ground state for NaFeSbO.
This article was published in the following journal.
Name: Inorganic chemistry
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