Low temperature heat capacity of bulk and nanophase ZnO and Zn1-xCoxO wurtzite phases

被引：22

作者：

Ma, Chengcheng ^{[1
,2
]}

Shi, Quan ^{[3
]}

Woodfield, Brian F. ^{[3
]}

Navrotsky, Alexandra ^{[1
,2
]}

机构：

[1] Univ Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 USA

[2] Univ Calif Davis, NEAT ORU, Davis, CA 95616 USA

[3] Brigham Young Univ, Dept Chem & Biochem, Provo, UT 84602 USA

来源：

JOURNAL OF CHEMICAL THERMODYNAMICS | 2013年 / 60卷

关键词：

ZnO-CoO; Nanoparticles; Surface entropy; Heat capacity; PPMS; THERMODYNAMIC FUNCTIONS; ZINC-OXIDE; DOPED ZNO; FERROMAGNETISM; FILMS; WATER;

D O I：

10.1016/j.jct.2013.01.004

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The low temperature heat capacity of the ZnO-CoO solid solution system was measured from 2 to 300 K using the heat capacity option of a Quantum Design Physical Property Measurement System (PPMS). The thermodynamic functions in this temperature range were derived by curve fitting. The standard entropies of bulk ZnO and bulk ZnO-CoO (wurtzite, 18 mol% CoO) at T = 298.15 K were calculated to be (43.1 +/- 0.4) J . mol (1) . K (1) and (45.2 +/- 0.5) J . mol (1) . K (1), respectively. The surface entropy of ZnO was evaluated to be (0.02 +/- 0.01) mJ . K (1) . m (2), which is essentially zero. No sharp magnetic transitions were observed in the solid solution samples. The nanophase solid solution, 12 mol% CoO, appears to bind H2O on its surface more strongly than ZnO. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：191 / 196

页数：6

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