Abstract

Manganites doped with potassium ions La_{1 – x}K_xMnO₃, where х = 0.0, 0.1, and 0.15, have been obtained by extraction-pyrolytic method at low temperature. The compounds have been studied by X-ray powder diffraction, electronic paramagnetic and ferromagnetic resonances. Unit cell parameters of La_{1 – x}K_xMnO₃ samples have been calculated. According to magnetic resonance spectroscopy, La_{1 – x}K_xMnO₃ exhibits phase delamination into paramagnetic and ferromagnetic phases. The fraction of the latter phase increases when temperature decreases. The temperature of transition from paramagnetic into ferromagnetic phase (Curie temperature, T_C) for La_{1 – x}K_xMnO₃ is –17.4, –13.7, and –4.8°С at х = 0.0, 0.1, and 0.15, respectively. The reason of symbate change in T_C and potassium ion concentration in La_{1 – x}K_xMnO₃ is supposed to be the change in the content of ferromagnetic pairs Mn³⁺–О^2––Mn⁴⁺ in the manganites.

中文翻译：

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钾离子掺杂锰酸镧的合成及磁共振

摘要

通过低温萃取-热解法获得了掺杂钾离子La _{1 – x} K _x MnO _{3 的}锰酸盐，其中х = 0.0、0.1和0.15。这些化合物已通过X射线粉末衍射、电子顺磁和铁磁共振进行了研究。计算了La _{1 – x} K _x MnO ₃样品的晶胞参数。根据磁共振波谱，La _{1 – x} K _x MnO ₃表现出相分层，分为顺磁相和铁磁相。当温度降低时，后一相的比例增加。La _{1 – x} K _x MnO ₃从顺磁相转变为铁磁相的温度（居里温度，T _{C ）在}х = 0.0、0.1 和 0.15 时分别为 –17.4、–13.7 和 –4.8°С 。_{La 1 – x} K _x MnO _3中T _C和钾离子浓度对称变化的原因可能是锰酸盐中铁磁对Mn ³⁺ –О ^2– –Mn ^{4+含量的变化。}