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A new route for the synthesis of calcium-deficient hydroxyapatites with low Ca/P ratio: Both spectroscopic and electric characterization

Published online by Cambridge University Press:  31 January 2011

M. Andrés-Vergés ,
C. Fern´andez-González ,
M. Martínez-Gallego ,
J. D. Solier ,
I. Cachadiña  and
E. Matijević
M. Andrés-Vergés
Affiliation:
Departamento de Química Inorgánica, Universidad de Extremadura, Avda. Elvas s/n. 06071-Badajoz, Spain
C. Fern´andez-González
Affiliation:
Departamento de Química Inorgánica, Universidad de Extremadura, Avda. Elvas s/n. 06071-Badajoz, Spain
M. Martínez-Gallego
Affiliation:
Departamento de Química Inorgánica, Universidad de Extremadura, Avda. Elvas s/n. 06071-Badajoz, Spain
J. D. Solier
Affiliation:
Departamento de Física, Universidad de Extremadura, Avda. Elvas s/n. 06071-Badajoz, Spain
I. Cachadiña
Affiliation:
Departamento de Física, Universidad de Extremadura, Avda. Elvas s/n. 06071-Badajoz, Spain
E. Matijević
Affiliation:
Center for Advanced Materials Processing, Clarkson University, Potsdam, New York 13699–5814
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Abstract

A new route for obtaining calcium-deficient apatites with a Ca/P ratio lower than 1.5 is described, in order to study their proton conduction at temperatures lower than 400 °C. The process is based on the hydrolysis of a mixed solution of Ca(NO3)2 and NH4H2PO4 in the presence of hexamethylenetetramine at a pH of approximately 5 and temperatures of 85–90 °C. The resulting spherical particles of 14 μm in average diameter were aggregates of smaller needles with approximate composition Ca8.5(HPO4)2(PO4)4OH · H2O. The effects of the reagent concentrations, pH, aging time, and temperature were studied, and the solids were characterized by x-ray diffraction, infrared absorption spectroscopy, and electron microscopy. The ionic conduction measured by alternating-current impedance spectroscopy yielded a value of 3 μSm−1 at 200 °C.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 11 , November 2000 , pp. 2526 - 2533
Copyright
Copyright © Materials Research Society 2000

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References

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