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X-ray diffraction and vibrational-spectroscopy study of the structure of La2Ti2O7

Published online by Cambridge University Press:  31 January 2011

U. Balachandran  and
N. G. Eror
U. Balachandran
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
N. G. Eror
Affiliation:
Oregon Graduate Center, Beaverton, Oregon 97006
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Abstract

The compound La2Ti2O7 was prepared by a liquid mix technique and examined at room temperature by x-ray diffraction, infrared absorption, and Raman spectroscopy. The examinations confirm and supplement the earlier observation by x-ray diffraction that La2Ti2O7 crystallizes in the monoclinic structure without an inversion symmetry. The energy-shifts (cm−1) that were observed in the vibrational spectra may be explained by a sixfold coordination for the titanium and a ninefold coordination for the lanthanum in the structure. This type of coordination satisfies Pauling's electrostatic valence rule regarding the electrostatic bond strengths at the shared anions.

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Articles
Information
Journal of Materials Research , Volume 4 , Issue 6 , December 1989 , pp. 1525 - 1528
Copyright
Copyright © Materials Research Society 1989

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References

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