纳米粉ZnO的制备及低温热容研究

无机材料学报

纳米粉ZnO的制备及低温热容研究

易求实¹; 吴新明^1,2; 谭志诚²

1. 湖北教育学院化学系, 武汉 430060; 2. 中国科学院大连化学物理研究所, 大连 116023

收稿日期:2000-09-07 修回日期:2000-11-27 出版日期:2001-07-20 网络出版日期:2001-07-20

Preparation and Low Temperature Heat Capacity of the ZnO Nano-Powders

YI Qiu-Shi¹; WU Xin-Ming^1,2; TAN Zhi-Cheng ²

1. Department of Chemistry; College education of Hubei; Wuhan 430060; China; 2. Thermochemistry Laboratory; Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116023; Chin

Received:2000-09-07 Revised:2000-11-27 Published:2001-07-20 Online:2001-07-20

摘要/Abstract

摘要： 采用液相沉淀新方法制备了ＺｎＯ纳米晶超微粉末，ＸＲＤ和ＴＥＭ分析结果表明，平均粒径为１８ｎｍ，纤锌矿晶相结构，粒径分布范围较窄．化学分析和ＩＣＰ联合测定，其纯度＞９９．９％．在７８～３７０Ｋ温区，用高精密全自动量热仪测定了热容，拟合出热容随温度变化的多项式方程：Ｃ_ｐ＝４０．０４２＋２４．５５４Ｘ＋０．９３０３３Ｘ^２＋２．１６４９Ｘ^３一１．８３８９Ｘ^４；并与粗晶ＺｎＯ热容文献值进行比较，从能量的角度分析了各热容曲线不同的原因．

关键词: 纳米ZnO, 纤锌矿晶型, 液相沉淀法, 低温热容

Abstract: The 18nm ZnO ultrafine powders with the wurtzite phase were prepared by using a new method of liquidoid
precipitation, and characterized by XRD, TEM. The heat capacities of the powder in 78-370K were also measured with a high precision automatic
adiabatic calorimeter and compared with that of the coarse crystal powders cited from literature. The relation between heat capacities and grain sizes
of the nano ZnO powders was demonstrated in the view of energetics. The results obtained show that the distribution of the nano ZnO powders is narrow,
and their purity is more then 99.9%. The polynomal equation fitted expressing the change of heat capacities with temperatures is C_p=
40.042+24.554X+0.93033X²+2.1649X³-1.8389X⁴.

Key words: nanometer ZnO, wurtzite phase, liquidoid precipitation method, low-temperature heat capacity

中图分类号:

TF12

易求实,吴新明,谭志诚. 纳米粉ZnO的制备及低温热容研究[J]. 无机材料学报.

YI Qiu-Shi,WU Xin-Ming,TAN Zhi-Cheng. Preparation and Low Temperature Heat Capacity of the ZnO Nano-Powders[J]. Journal of Inorganic Materials.

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