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Title: Kinetic analysis of the thermal stability of lithium silicates (Li{sub 4}SiO{sub 4} and Li{sub 2}SiO{sub 3})

Abstract

The kinetics describing the thermal decomposition of Li{sub 4}SiO{sub 4} and Li{sub 2}SiO{sub 3} have been analysed. While Li{sub 4}SiO{sub 4} decomposed on Li{sub 2}SiO{sub 3} by lithium sublimation, Li{sub 2}SiO{sub 3} was highly stable at the temperatures studied. Li{sub 4}SiO{sub 4} began to decompose between 900 and 1000 deg. C. However, at 1100 deg. C or higher temperatures, Li{sub 4}SiO{sub 4} melted, and the kinetic data of its decomposition varied. The activation energy of both processes was estimated according to the Arrhenius kinetic theory. The energy values obtained were -408 and -250 kJ mol{sup -1} for the solid and liquid phases, respectively. At the same time, the Li{sub 4}SiO{sub 4} decomposition process was described mathematically as a function of a diffusion-controlled reaction into a spherical system. The activation energy for this process was estimated to be -331 kJ mol{sup -1}. On the other hand, Li{sub 2}SiO{sub 3} was not decomposed at high temperatures, but it presented a very high preferential orientation after the heat treatments.

Authors:
 [1];  [2];  [1];  [3];  [4]
  1. Departamento de Quimica, Instituto Nacional de Investigaciones Nucleares, Apdo. Postal 18-1027, Mexico 11801, D.F. (Mexico)
  2. (Mexico)
  3. Departamento de Quimica, Universidad Autonoma Metropolitana, Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, Apdo. Postal 55-532, 09340, Mexico D.F. (Mexico)
  4. Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Circuito exterior s/n, CU, Del. Coyoacan, 04510, Mexico D.F. (Mexico). E-mail: pfeiffer@zinalco.iimatercu.unam.mx
Publication Date:
OSTI Identifier:
20784936
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 179; Journal Issue: 3; Other Information: DOI: 10.1016/j.jssc.2005.12.020; PII: S0022-4596(05)00606-7; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACTIVATION ENERGY; HEAT TREATMENTS; KINETICS; LITHIUM SILICATES; PYROLYSIS; STABILITY; SUBLIMATION; TEMPERATURE RANGE 1000-4000 K

Citation Formats

Cruz, Daniel, Facultad de Ciencias, Universidad Autonoma del Estado de Mexico, Instituto Literario No 100 Col. Centro C.P. 50000, Toluca, Edo. de Mexico, Bulbulian, Silvia, Lima, Enrique, and Pfeiffer, Heriberto. Kinetic analysis of the thermal stability of lithium silicates (Li{sub 4}SiO{sub 4} and Li{sub 2}SiO{sub 3}). United States: N. p., 2006. Web. doi:10.1016/j.jssc.2005.12.020.
Cruz, Daniel, Facultad de Ciencias, Universidad Autonoma del Estado de Mexico, Instituto Literario No 100 Col. Centro C.P. 50000, Toluca, Edo. de Mexico, Bulbulian, Silvia, Lima, Enrique, & Pfeiffer, Heriberto. Kinetic analysis of the thermal stability of lithium silicates (Li{sub 4}SiO{sub 4} and Li{sub 2}SiO{sub 3}). United States. doi:10.1016/j.jssc.2005.12.020.
Cruz, Daniel, Facultad de Ciencias, Universidad Autonoma del Estado de Mexico, Instituto Literario No 100 Col. Centro C.P. 50000, Toluca, Edo. de Mexico, Bulbulian, Silvia, Lima, Enrique, and Pfeiffer, Heriberto. Wed . "Kinetic analysis of the thermal stability of lithium silicates (Li{sub 4}SiO{sub 4} and Li{sub 2}SiO{sub 3})". United States. doi:10.1016/j.jssc.2005.12.020.
@article{osti_20784936,
title = {Kinetic analysis of the thermal stability of lithium silicates (Li{sub 4}SiO{sub 4} and Li{sub 2}SiO{sub 3})},
author = {Cruz, Daniel and Facultad de Ciencias, Universidad Autonoma del Estado de Mexico, Instituto Literario No 100 Col. Centro C.P. 50000, Toluca, Edo. de Mexico and Bulbulian, Silvia and Lima, Enrique and Pfeiffer, Heriberto},
abstractNote = {The kinetics describing the thermal decomposition of Li{sub 4}SiO{sub 4} and Li{sub 2}SiO{sub 3} have been analysed. While Li{sub 4}SiO{sub 4} decomposed on Li{sub 2}SiO{sub 3} by lithium sublimation, Li{sub 2}SiO{sub 3} was highly stable at the temperatures studied. Li{sub 4}SiO{sub 4} began to decompose between 900 and 1000 deg. C. However, at 1100 deg. C or higher temperatures, Li{sub 4}SiO{sub 4} melted, and the kinetic data of its decomposition varied. The activation energy of both processes was estimated according to the Arrhenius kinetic theory. The energy values obtained were -408 and -250 kJ mol{sup -1} for the solid and liquid phases, respectively. At the same time, the Li{sub 4}SiO{sub 4} decomposition process was described mathematically as a function of a diffusion-controlled reaction into a spherical system. The activation energy for this process was estimated to be -331 kJ mol{sup -1}. On the other hand, Li{sub 2}SiO{sub 3} was not decomposed at high temperatures, but it presented a very high preferential orientation after the heat treatments.},
doi = {10.1016/j.jssc.2005.12.020},
journal = {Journal of Solid State Chemistry},
number = 3,
volume = 179,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}