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

Research output: Contribution to journalArticle

13 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)368-377
Number of pages10
JournalJournal of Solid State Chemistry
Volume93
Issue number2
DOIs
Publication statusPublished - 1991

Fingerprint

Hydrogels
zirconium oxides
Zirconia
Gels
titanium
Titanium
Metals
Chemical activation
gels
activation
Crystallization
pretreatment
metals
phase transformations
Phase transitions
crystallization
Oxygen
aqueous solutions
vibration
Geometry

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

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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.",
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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

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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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