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Metastable ZrO~2~ crystal structures in electron beam evaporated thin films by S.K. Peneva; S. Gutzov; K.D. Djuneva; G. Atanasov; Ts. Marinova is a Chemistry article available to read on EtoBox.

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Electron diffraction evidence for the existence of metastable ZrO~2~ in thin zirconia films grown by electron beam evaporation is presented. X-ray powder diffraction results show that the films are at the boundary of the amorphous/crystalline state of the matter. Micro-regions of unknown crystalline structures of ZrO~2~ are formed during the growth and are observed by transmission and reflection electron diffraction. Two CaF~2~-type zircon oxides exist inside the films. They are the known high temperature cubic phase with lattice parameter a = 5.09 ± 0.08 Å and an isostructural analogue with a = 5.40 ± 0.10 Å. Series of hexagonal and cubic close packed structures, believed to be related to the packing of clusters, are also detected. The existence of metastable zirconia structures is explained by Ostwald's rule of stages. A comparison of some of the metastable oxide structures of ZrO~2~ films with their isostructural analogues observed in SiO~2~ and SnO~2~ films is included.

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Author

S.K. Peneva; S. Gutzov; K.D. Djuneva; G. Atanasov; Ts. Marinova

Publisher

Walter de Gruyter GmbH

Published

2000

Language

EN

Field

Chemistry (Physical Sciences)