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Modification of the phase transition temperatures in titania doped with various cations

Published online by Cambridge University Press:  31 January 2011

R. Rodríguez-Talavera ,
S. Vargas ,
R. Arroyo-Murillo ,
R. Montiel-Campos  and
E. Haro-Poniatowski
R. Rodríguez-Talavera*
Affiliation:
Departmento de Física, Universidad Autónoma Metropolitana-Iztapalapa Apdo. Postal 55–534, México, D.F. 09340
S. Vargas
Affiliation:
Departmento de Química, Universidad Autónoma Metropolitana-Iztapalapa Apdo. Postal 55–534, México, D.F. 09340
R. Arroyo-Murillo
Affiliation:
Departmento de Química, Universidad Autónoma Metropolitana-Iztapalapa Apdo. Postal 55–534, México, D.F. 09340
R. Montiel-Campos
Affiliation:
Departmento de Física, Universidad Autónoma Metropolitana-Iztapalapa Apdo. Postal 55–534, México, D.F. 09340
E. Haro-Poniatowski
Affiliation:
Departmento de Física, Universidad Autónoma Metropolitana-Iztapalapa Apdo. Postal 55–534, México, D.F. 09340
*
a)Author to whom correspondence should be addressed.
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Abstract

Titania matrices prepared by a sol-gel technique were doped with several cations (La, Zn, Al, K, Na, Ca, Ba, and Co). The effect of the dopants on the thermal and structural properties of the materials is analyzed. The dopant concentration was 2% mol with respect to titanium, and in all cases the same anion (nitrate) was used. The transition temperatures from amorphous to anatase and from anatase to rutile were measured using x-ray diffraction. The amorphous-anatase transition is independent, for almost all samples, of the type of dopant used; however, the anatase-to-rutile phase transition depends strongly on the kind of cation. This means that the temperature range where the anatase phase exists can be controlled by choosing the appropriate dopant. We have found a correlation between the anatase-rutile phase transition temperature and the radius of the cations and their electric charge.

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Articles
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Journal of Materials Research , Volume 12 , Issue 2 , February 1997 , pp. 439 - 443
Copyright
Copyright © Materials Research Society 1997

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References

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