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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Crystal structure, magnetic properties and ESR spectra of Ca_3Co_(2-x)Fe_xO_6
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Crystal structure, magnetic properties and ESR spectra of Ca_3Co_(2-x)Fe_xO_6

机译：Ca_3Co_（2-x）Fe_xO_6的晶体结构，磁性能和ESR谱

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摘要

We have synthesized compounds of Ca_3Co_(2-x)Fe_xO_6 (x=0-1.5) by sol-gel reaction method. X-ray diffraction data show that the solubility limit of Fe in the spin-chain compound Ca_3Co_2O_6 is about x = 0.7. For the rhombohedral (R3c) samples with x < 0.7, the upward deviation from the paramagnetic Curie-Weiss law in the inverse magnetic susceptibility (HIM) tends to be suppressed at x = 0.7. Correlatively, the paramagnetic Curie temperature θ_p approaches zero at this concentration. The M(N) curves exhibit a well-defined ferrimagnetic state, which becomes smeared out with increasing Fe concentration and nearly disappears at x = 0.7. For the triclinic (P1) samples with x= 1.1, the magnetization is much small and its ground state is antiferromagnetic. The H/M curve measured up to 300 K does not follow the Curie-Weiss law. Finally, ESR spectra composed of eight hyperfine splittings due to Co nuclear spin are observed for x=0.4.
机译：我们已经通过溶胶-凝胶反应方法合成了Ca_3Co_（2-x）Fe_xO_6（x = 0-1.5）的化合物。 X射线衍射数据表明，Fe在自旋链化合物Ca_3Co_2O_6中的溶解度极限约为x ＝ 0.7。对于x <0.7的菱面体（R3c）样品，在x = 0.7时，倾向于抑制顺磁居里-魏斯定律的逆磁化率（HIM）的向上偏差。相应地，顺磁性居里温度θ_p在该浓度下接近零。 M（N）曲线表现出明确的亚铁磁状态，随着铁浓度的增加而被涂污，在x = 0.7时几乎消失。对于x = 1.1的三斜（P1）样品，磁化强度很小，其基态是反铁磁性的。高达300 K的H / M曲线不符合居里-魏斯定律。最后，在x = 0.4时观察到由八个超细分裂（由于Co核自旋）组成的ESR光谱。

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