Effects of mechanical activation of inorganic gels on their thermal behavior. 2. Comparison of structure and thermal behavior between zirconia and titania gels

Tetsuhiko Isobe; Mamoru Senna

doi:10.1016/0022-4596(91)90311-5

Effects of mechanical activation of inorganic gels on their thermal behavior. 2. Comparison of structure and thermal behavior between zirconia and titania gels

Tetsuhiko Isobe, Mamoru Senna

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Changes in the temperature of crystallization, T_crys, due to mechanical pretreatment were entirely opposite between titania and zirconia hydrogels. The T_crys of the titania decreased by 18 and 44 K on rotation- and vibration-milling, respectively, while those for the zirconia increased by 14 and 18 K or 16 and 45 K, depending on the starting aqueous solutions, i.e., ZrOCl₂ or ZrO(NO₃)₂, respectively. These phenomena were discussed in terms of the microscopic phase transformation processes in noncrystalline gels during mechanical treatment. The difference between two hydrogels was concluded to be attributed to the differences in the geometry of the construction units, TiO₆ and ZrO₈, and the bond nature of metal-oxygen and metal-OH between TiO₂ and ZrO₂.

Original language	English
Pages (from-to)	368-377
Number of pages	10
Journal	Journal of Solid State Chemistry
Volume	93
Issue number	2
DOIs	https://doi.org/10.1016/0022-4596(91)90311-5
Publication status	Published - 1991 Aug

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/0022-4596(91)90311-5

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title = "Effects of mechanical activation of inorganic gels on their thermal behavior. 2. Comparison of structure and thermal behavior between zirconia and titania gels",

abstract = "Changes in the temperature of crystallization, Tcrys, due to mechanical pretreatment were entirely opposite between titania and zirconia hydrogels. The Tcrys of the titania decreased by 18 and 44 K on rotation- and vibration-milling, respectively, while those for the zirconia increased by 14 and 18 K or 16 and 45 K, depending on the starting aqueous solutions, i.e., ZrOCl2 or ZrO(NO3)2, respectively. These phenomena were discussed in terms of the microscopic phase transformation processes in noncrystalline gels during mechanical treatment. The difference between two hydrogels was concluded to be attributed to the differences in the geometry of the construction units, TiO6 and ZrO8, and the bond nature of metal-oxygen and metal-OH between TiO2 and ZrO2.",

author = "Tetsuhiko Isobe and Mamoru Senna",

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T1 - Effects of mechanical activation of inorganic gels on their thermal behavior. 2. Comparison of structure and thermal behavior between zirconia and titania gels

AU - Isobe, Tetsuhiko

AU - Senna, Mamoru

PY - 1991/8

Y1 - 1991/8

N2 - Changes in the temperature of crystallization, Tcrys, due to mechanical pretreatment were entirely opposite between titania and zirconia hydrogels. The Tcrys of the titania decreased by 18 and 44 K on rotation- and vibration-milling, respectively, while those for the zirconia increased by 14 and 18 K or 16 and 45 K, depending on the starting aqueous solutions, i.e., ZrOCl2 or ZrO(NO3)2, respectively. These phenomena were discussed in terms of the microscopic phase transformation processes in noncrystalline gels during mechanical treatment. The difference between two hydrogels was concluded to be attributed to the differences in the geometry of the construction units, TiO6 and ZrO8, and the bond nature of metal-oxygen and metal-OH between TiO2 and ZrO2.

AB - Changes in the temperature of crystallization, Tcrys, due to mechanical pretreatment were entirely opposite between titania and zirconia hydrogels. The Tcrys of the titania decreased by 18 and 44 K on rotation- and vibration-milling, respectively, while those for the zirconia increased by 14 and 18 K or 16 and 45 K, depending on the starting aqueous solutions, i.e., ZrOCl2 or ZrO(NO3)2, respectively. These phenomena were discussed in terms of the microscopic phase transformation processes in noncrystalline gels during mechanical treatment. The difference between two hydrogels was concluded to be attributed to the differences in the geometry of the construction units, TiO6 and ZrO8, and the bond nature of metal-oxygen and metal-OH between TiO2 and ZrO2.

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Effects of mechanical activation of inorganic gels on their thermal behavior. 2. Comparison of structure and thermal behavior between zirconia and titania gels

Abstract

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