Abbas Yasir, Kiani Haris Farooq, Kamran M, Anis-Ur-Rehman M
Applied Thermal Physics Laboratory, Department of Physics COMSATS University Islamabad, Islamabad 45550, Pakistan.
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 2000240, China.
Phys Chem Chem Phys. 2024 Sep 25;26(37):24322-24334. doi: 10.1039/d4cp02111h.
The suggested novel rare-earth doped bismuth calcium cobaltites BiCaSmLaCoO ( = 0.000-0.075) were synthesized by a co-precipitation route. XRD was utilized for structural information. SEM and EDX were used for microstructural and elemental analysis. AC conductivities () were measured at temperatures of 100-500 °C. The of all synthesized samples increased as the temperature increased, indicating that they are semi-conductive. The conduction process of all the synthesized samples was examined using Jonscher's power law. The spreading factor and relaxation time of all the synthesized samples were studied using nonlinear Debye fitting. At a high temperature of 500 °C, the dielectric curve showed anomalous behaviour that was related to the negative values of the dielectric constant at 500 kHz-3 MHz. The studied (Sm-La)-doped samples showed higher values of the dielectric constant (1.03 × 10). The Cole-Cole plot used in the impedance investigation reveals that as the temperature rises, the diameter of the arcs decreases, implying a drop in impedance and rises in conductivity. The growing trend of DC electrical conductivity with temperature depicts the semi-conductive nature of the synthesized materials.
通过共沉淀法合成了建议的新型稀土掺杂铋钙钴酸盐BiCaSmLaCoO（= 0.000 - 0.075）。利用X射线衍射（XRD）获取结构信息。使用扫描电子显微镜（SEM）和能量散射X射线光谱（EDX）进行微观结构和元素分析。在100 - 500℃的温度下测量交流电导率（）。所有合成样品的电导率随温度升高而增加，表明它们是半导体。使用琼舍尔幂定律研究了所有合成样品的传导过程。使用非线性德拜拟合研究了所有合成样品的扩展因子和弛豫时间。在500℃的高温下，介电曲线呈现出异常行为，这与500 kHz - 3 MHz下介电常数的负值有关。所研究的（Sm - La）掺杂样品显示出更高的介电常数（1.03×10）值。阻抗研究中使用的科尔 - 科尔图表明，随着温度升高，弧的直径减小，这意味着阻抗下降和电导率上升。直流电导率随温度的增长趋势描绘了合成材料的半导体性质。
