Abstract

Nanocomposite from Copper tungstate (CuWO₄) was prepared by co-precipitation method. The resulting precipitate was annealed at low temperature (400 degree) with heating/cooling rate of 1 °C/min. The obtained nanocomposite was characterized by X-ray diffraction (XRD), which demonstrated that the CuWO₄ powder belongs to the distorted tungstate type of structure with space group PI(2) and describe the CuWO₄ as infinite zigzag chains formed by edge-sharing alternating < CuO₆> and < WO₆> octahedral faces. Also, crystallite size, as calculated from XRD, was found to be 6 nm. The high resolution transmission electron microscope (TEM) revealed that the CuWO₄ nanocomposite takes the shape as rod particles with length is 60 nm and its diameter doesn’t exceed 10 nm. Also, the thermal stability was investigated via differential thermal analysis (DTA) and thermo-gravimetric analysis (TGA). Dielectric constant (έ) and electrical conductivity ₍σ_ac) for the prepared sample were measured in a wide temperature range as a function of frequency.

抽象的

采用共沉淀法制备了钨酸铜纳米复合材料（CuWO ₄）。将得到的沉淀物在低温（400度）下以1℃/ min的加热/冷却速率进行退火。通过X射线衍射（XRD）表征获得的纳米复合材料，表明CuWO ₄粉末属于扭曲的钨酸盐型结构，具有空间群PI（2），并将CuWO ₄描述为通过边缘共享形成的无限之字形链交替的<CuO ₆ >和<WO ₆ >八面体面。另外，由XRD计算出的微晶尺寸为6nm。高分辨率透射电子显微镜（TEM）显示CuWO ₄纳米复合材料呈棒状，其长度为60 nm，直径不超过10 nm。此外，还通过差热分析（​​DTA）和热重分析（TGA）研究了热稳定性。介电常数（έ）和电导率_（ σ _AC）为所制备的样品在很宽的温度范围内作为频率的函数进行测量。