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Room-Temperature Synthesis and Electrical Properties of La, Nd and Gd Apatite-type Silicates

Published online by Cambridge University Press:  26 February 2011

Antonio F. Fuentes
Affiliation:
antonio.fernandez@cinvestav.edu.mx, Cinvestav, Unidad Saltillo, Carretera Saltillo-Monterrey Km. 13, Ramos Arizpe, Coahuila, 25900, Mexico
Luis G. Martinez-Gonzalez
Affiliation:
luis.martinez@cinvestav.edu.mx, Cinvestav, Unidad Saltillo, Carretera Saltillo-Monterrey Km. 13, Ramos Arizpe, Coahuila, 25900, Mexico
Karla J. Moreno
Affiliation:
karla.moreno@cinvestav.edu.mx, Cinvestav, Unidad Saltillo, Carretera Saltillo-Monterrey Km. 13, Ramos Arizpe, Coahuila, 25900, Mexico
Evelyn Rodriguez-Reyna
Affiliation:
evyal_20@hotmail.com, Cinvestav, Unidad Saltillo, Carretera Saltillo-Monterrey Km. 13, Ramos Arizpe, Coahuila, 25900, Mexico
Ulises Amador
Affiliation:
uamador@ceu.es, Facultad de Farmacia, Universidad San Pablo-CEU, Departamento de Quimica, Boadilla del Monte, Madrid, 28668, Spain
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Abstract

We show in this paper the possibility of using mechanical milling to prepare apatite-type La, Nd and Gd silicates starting from stoichiometric mixtures of the constituent oxides. XRD patterns collected after grinding the starting mixtures for 9 hours contain only the characteristic reflections of the target materials with no other phase apparently present. Electrical conductivity data were successfully fitted to a Jonscher-type empirical expression with fractional exponent n included in the 0.35-0.75 range. Activation energies for oxygen migration were found to decrease as the size of the rare-earth cation increases. Therefore, the highest conductivity values were found for the apatite-type lanthanum silicate.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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References

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Room-Temperature Synthesis and Electrical Properties of La, Nd and Gd Apatite-type Silicates
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