用于先进压敏电阻应用的纳米晶掺杂氧化锌粉末的合成与表征

Synthesis and Characterization of Nanocrystalline Doped-ZnO Powder for Advanced Varistor Application.

作者信息

Anwar M S, Ahmed Faheem, Koo Bon Heun

出版信息

J Nanosci Nanotechnol. 2015 Oct;15(10):8271-4. doi: 10.1166/jnn.2015.11284.

DOI:10.1166/jnn.2015.11284

Abstract

The nanocrystalline doped ZnO powder has been synthesized by solution combustion method using sucrose as fuel and zinc acetate as oxidant. The as-prepared nanopowders were characterized by XRD, showing particle size approximately 39 and 48 nm for fuel to oxidant ratio of 1:1 (stoichiometric) and 2:1 (fuel rich). The powders were compacted and sintered for 9 hours. The sintered samples were characterized by SEM and XRD, showing the presence of spinel (Zn7Sb2Ol2) and pyroclore (Zn2Bi3Sb3Ol4) phases at intergranular spacing. The phase distribution [spinel (Zn7Sb2Ol2), pyroclore (Zn2Bi3Sb3O14), β-Bi2O3, and δ-Bi203] was found to be more homogeneous in case of samples obtained by adding the stoichiometric amount of fuel. The current-voltage (J-E) characterization shows the high non-linearity coefficient (α) ~22 and break-down voltage (VB) of ~0.41 kV/mm for the fuel rich sample.

摘要

采用溶液燃烧法，以蔗糖为燃料、醋酸锌为氧化剂合成了纳米晶掺杂氧化锌粉末。通过X射线衍射（XRD）对所制备的纳米粉末进行表征，结果表明，当燃料与氧化剂的比例为1:1（化学计量比）和2:1（富燃料）时，颗粒尺寸分别约为39纳米和48纳米。将粉末压实并烧结9小时。通过扫描电子显微镜（SEM）和XRD对烧结后的样品进行表征，结果显示在晶界间距处存在尖晶石（Zn7Sb2Ol2）和烧绿石（Zn2Bi3Sb3Ol4）相。发现在添加化学计量燃料量所获得的样品中，相分布[尖晶石（Zn7Sb2Ol2）、烧绿石（Zn2Bi3Sb3O14）、β-Bi2O3和δ-Bi203]更为均匀。电流-电压（J-E）表征显示，富燃料样品的非线性系数（α）约为22，击穿电压（VB）约为0.41 kV/mm。