Direct calorimetric measurement of grain boundary and surface enthalpies in yttria-stabilized zirconia

被引：21

作者：

Chen, Shushu ^{[1
,2
]}

Avila-Paredes, Hugo J. ^{[3
]}

Kim, Sangtae ^{[2
,3
]}

Zhao, Jinfeng ^{[3
]}

Munir, Zuhair A. ^{[3
]}

Navrotsky, Alexandra ^{[1
,2
,3
]}

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] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2009年 / 11卷 / 17期

关键词：

SOLUTE SEGREGATION; ENERGETICS; ENERGY;

D O I：

10.1039/b819740g

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We measured the change in enthalpy with grain size of a dense nanograined yttria-stabilized zirconia by oxide melt solution calorimetry and derived a grain boundary enthalpy, 0.73 +/- 0.19 J m(-2). Surface enthalpies of nanopowders are 2.21 +/- 0.14 J m(-2) (anhydrous surface) and 1.60 +/- 0.09 J m(-2) (hydrous surface). The grain boundary enthalpy is about a factor of two smaller than the enthalpy of the anhydrous surface, suggesting that densification which maintains nanosized grains is indeed thermodynamically driven. This is the first direct calorimetric measurement of grain boundary enthalpy in a ceramic.

引用

页码：3039 / 3042

页数：4

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