Direct measurements of water adsorption enthalpy on hafnia and zirconia

被引：139
作者：
Ushakov, SV
Navrotsky, A [1 ]
机构：
[1] Univ Calif Davis, Thermochem Facil, Davis, CA 95616 USA
[2] Univ Calif Davis, NEAT ORU, Davis, CA 95616 USA
来源：
APPLIED PHYSICS LETTERS | 2005年 / 87卷 / 16期
关键词：
D O I：
10.1063/1.2108113
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A commercial surface area analyzer and Calvet-type microcalorimeter were combined for measurements of heats of gas-solid interactions, providing enhanced resolution, flexibility, and throughput compared to conventional methods. Integral adsorption enthalpies for half monolayer coverage on HfO2 and ZrO2 surfaces were found to be in the range -130-190 and -110-170 kJ per mole of gaseous H2O for differently prepared monoclinic phases and -70 and -90 kJ/mole for tetragonal phases from precipitation. The surface enthalpy for anhydrous tetragonal ZrO2 was derived as 1.23 +/- 0.04 J/m(2) from water adsorption and high-temperature solution calorimetry data. (C) 2005 American Institute of Physics.
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页码：1 / 3
页数：3
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