Reaction kinetics in sub-micronic powders the ZrO$sub 2$--CaO system
Journal Article
·
· Rev. Roum. Chim., v. 18, no. 10, pp. 1699-1708
OSTI ID:4364176
The kinetic study of the reaction ZrO/sub 2/ + CaO in mixtures of submicronic crystals in the temperature range 900 to 1150 deg C shows that the reaction takes place according to an equation of the Avrami-Erofeev type: 1 - z = exp (-Kt/sup n/) with n < 1, and the factor controlling the reaction rate is the formation of new germs. Between 900 and l00 deg C, the activation energy was also determined at 53.9 kcal/mol. Over 1000 deg C the phase transitions influence considerably the reaction mechanism. (auth)
- Research Organization:
- Centre of Physical Chemistry, Bucharest
- NSA Number:
- NSA-29-015341
- OSTI ID:
- 4364176
- Journal Information:
- Rev. Roum. Chim., v. 18, no. 10, pp. 1699-1708, Journal Name: Rev. Roum. Chim., v. 18, no. 10, pp. 1699-1708; ISSN RCHRA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
*CALCIUM COMPOUNDS-- CHEMICAL REACTION YIELD
*CALCIUM OXIDES-- CHEMICAL REACTION KINETICS
*ZIRCONATES-- CHEMICAL REACTION YIELD
*ZIRCONIUM OXIDES-- CHEMICAL REACTION KINETICS
ACTIVATION ENERGY
CRYSTAL LATTICES
N40210* --Chemistry--Inorganic
Organic
& Physical Chemistry--Chemical & Physiochemical Properties
N50130 --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
PHASE TRANSFORMATIONS
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE
*CALCIUM OXIDES-- CHEMICAL REACTION KINETICS
*ZIRCONATES-- CHEMICAL REACTION YIELD
*ZIRCONIUM OXIDES-- CHEMICAL REACTION KINETICS
ACTIVATION ENERGY
CRYSTAL LATTICES
N40210* --Chemistry--Inorganic
Organic
& Physical Chemistry--Chemical & Physiochemical Properties
N50130 --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
PHASE TRANSFORMATIONS
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE