CrO2-to-Cr2O3 Transformation in a Three-Dimensional Interference Field of Ultraviolet Laser Light - Archive ouverte HAL
Article Dans Une Revue Crystal Growth & Design Année : 2010

CrO2-to-Cr2O3 Transformation in a Three-Dimensional Interference Field of Ultraviolet Laser Light

Résumé

In a previous work (J. Cryst. Growth 2009, 311, 2590), direct growth of a Ice architecture of Cr2O3 phase onto (001)TiO2 substrates has been obtained by photolysis of CrO2Cl2 in a three-dimensional interference field of UV laser light. This growth includes a step of CrO2-to-Cr2O3 transformation which is characterized in the present work from CrO2 layers irradiated in UV interferences. Cr2O3 is confirmed to form with specific crystallographic orientational relationships from results of X-ray diffraction, namely, [100](TiO2) parallel to [10 (1) over bar ]CrO2[010]TiO2 parallel to[111](Cr2O3), [100](TiO2) parallel to [001]CrO2 parallel to krzo, [001]TiO2[001]CrO2[1 (2) over bar1]Cr2O3. According to these relationships. four orientations of Cr2O3 domains are observed on (001)CrO2 but only two on (100)CrO2. From transmission electron microscopy observations, thin layers of Cr2O3 onto (100)CrO2 exhibit a structure in domains with two orientations which can be assumed to be in epitaxy with habit planes 100CrO2, parallel to 10 (1) over bar Cr2O3. This epitaxy is justified from the similarities existing between the atomic arrangements of these planes. Finally, experimental conditions for further growth of a Ice architecture constituted of pure epitaxial CrO2 phase are discussed.

Domaines

Matériaux
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Dates et versions

hal-01067573 , version 1 (23-09-2014)

Identifiants

Citer

M. Audier, M. Salaun, Hervé Roussel, F. Delyon, M. Duneau. CrO2-to-Cr2O3 Transformation in a Three-Dimensional Interference Field of Ultraviolet Laser Light. Crystal Growth & Design, 2010, 10 (4), pp.1923-1928. ⟨10.1021/cg1000254⟩. ⟨hal-01067573⟩
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