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Dielectric properties and structure of hydroxyapatite ceramics sintered by different conditions

Published online by Cambridge University Press:  03 March 2011

J.J. Prieto Valdes ,
A. Victorero Rodriguez  and
J. Guevara Carrio
J.J. Prieto Valdes*
Affiliation:
Laboratorio de Ceramicas Especiales-IMRE, Facultad de Fisica, Universidad de La Habana, San Lazaro y L, Vedado, La Habana, Cuba
A. Victorero Rodriguez
Affiliation:
Laboratorio de Ceramicas Especiales-IMRE, Facultad de Fisica, Universidad de La Habana, San Lazaro y L, Vedado, La Habana, Cuba
J. Guevara Carrio
Affiliation:
Laboratorio de Ceramicas Especiales-IMRE, Facultad de Fisica, Universidad de La Habana, San Lazaro y L, Vedado, La Habana, Cuba
*
a)Present address: Depto. Ciencia de Materials, ESFM-IPN, U.P. “Adolfo Lopez Mateo”, Edif. No. 9, Mcxico D.F. C.P. 07738, Mexico.
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Abstract

Several conditions for hydroxyapatite ceramic preparation were used: sintering at 1150 °C in air or under H2O vapor flow, quenched in water at room temperature after sintering, or slow cooling inside the furnace. Depending on specific combinations of these preparation conditions, in the resulting ceramics significant differences are observed in the phase composition and dielectric properties, ranging from capacitive to a semiconducting response. Comparison between the experimental x-ray diffraction patterns and those calculated by the Rietveld method show that during sintering in air, approximately 40% of hydroxyapatite is transformed to tricalcium phosphate. The XRD analysis shows that this transformation could be possible using the following process: Ca10(PO4)6(OH)2 = 2Ca3(PO4)2 + Ca2P2O7 + 2CaO + H2O.

Type
Rapid Communication
Information
Journal of Materials Research , Volume 10 , Issue 9 , September 1995 , pp. 2174 - 2177
Copyright
Copyright © Materials Research Society 1995

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References

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