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Crystal Growth of RNiO3 Perovskites Under High Oxygen Pressure and Hydrothermal Conditions.

Published online by Cambridge University Press:  15 February 2011

J.A. Alonso ,
M.J. Martínez-Lope ,
M.T. Casais ,
A. Muñoz ,
A. Largeteau  and
G. Demazeauc
J.A. Alonso
Affiliation:
Instituto de Ciencia de Materiales de Madrid, C.S.I.C., Cantoblanco, E-28049 Madrid, Spain.
M.J. Martínez-Lope
Affiliation:
Instituto de Ciencia de Materiales de Madrid, C.S.I.C., Cantoblanco, E-28049 Madrid, Spain.
M.T. Casais
Affiliation:
Instituto de Ciencia de Materiales de Madrid, C.S.I.C., Cantoblanco, E-28049 Madrid, Spain.
A. Muñoz
Affiliation:
Depto. de Física, EPS, Univ. Carlos III. Butarque 15, Leganés, E-28911 Madrid, Spain.
A. Largeteau
Affiliation:
Institut de Chimie de la Matière Condensée de Bordeaux – UPR-CNRS 9048 Université Bordeaux Sciences et Technologies, 87 Avenue du Dr. A. Schweitzer, 33608 PESSAC Cedex, France.
G. Demazeauc
Affiliation:
Institut de Chimie de la Matière Condensée de Bordeaux – UPR-CNRS 9048 Université Bordeaux Sciences et Technologies, 87 Avenue du Dr. A. Schweitzer, 33608 PESSAC Cedex, France.
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Abstract

Well-shaped single crystals of RNiO3 perovskites (R= Nd, Ho, Y) have been grown under high oxygen pressure conditions, in a piston-cylinder press at 2 GPa or in a belt-type press at 4 GPa. The reaction took place in sealed platinum capsules, in the presence of KClO3 as oxidizing agent. It seems that the choice of hydroxides of the involved cations as precursors is crucial for the success of the crystal growth, via water vapor transport reactions. The perovskites have been characterized by X-ray diffraction, scanning microscopy and DSC measurements, suitable to identify the metal insulator transition. The transition temperatures of the as-grown crystals show a significantly lower hysteresis in the heating and cooling runs than those reported for powder materials, suggesting a lower density of defects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 878: Symposium Y – Solvothermal Synthesis and Processing of Materials , 2005 , Y3.4
Copyright
Copyright © Materials Research Society 2005

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References

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