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Abstract：
We report the synthesis of Sr1·875Ce0·025CoO4-δ and Sr1·875Ce0·025Co0·75Ni0·25O4+δ for the first time, each compound was synthesised using Co-precipitation and Sol-Gel methods, at 1050 °C for 144 and 120 h respectively. Oxygen stoichiometry was determined using Iodometric titration, we have noticed oxygen hypostoichiometry for Ce-doped compound and hyperstoichiometry state after Ni-doping. Electrical properties were studied for sintered pellets, Electrical resistance was measured in the range (-0.5-+0.5 v). Specific electrical resistivity and electrical conductivity were calculated from resistance measurements. It was found that the Ce-doped compound has about three times higher conductivity (σC1 = 0.000000058423295 s cm-1) Compared with the Ni-doped one (σN2 = 0.000000022384787 s cm-1). Electrical Capacitance was measured at 1 kHz frequency, the relative dielectric constant εr, and the loss tangent tanδ were calculated accordingly. The results showed that the Ni-doped compound has higher capacitance but lower εr and dissipation factor values.
摘要：
我们首次报道了Sr1·875Ce0·025CoO4-δ和Sr1·875Ce0·025Co0·75Ni0·25O4δ的合成，使用共沉淀和溶胶-凝胶法合成每种化合物，在1050°C下分别持续144和120小时。使用碘量滴定法测定氧化学计量,我们已经注意到Ce掺杂化合物的氧化学计量比和Ni掺杂后的化学计量比高。研究了烧结颗粒的电性能，在范围(-0.5-+0.5v)内测量电阻。由电阻测量计算电阻率和电导率。发现Ce掺杂的化合物的电导率（σC1=0.00000058423295scm-1）是Ni掺杂的化合物（σN2=0.0000022384787scm-1）的三倍。在1kHz频率下测量电容，相对介电常数εr，并且相应地计算损耗正切tanδ。结果表明，掺杂镍的化合物具有较高的电容，但较低的εr和耗散因数值。
