Scientific article

English

Structural morphology of YBa₂Cu₃O_7-x

ContributorsSun, Bing Nan; Hartman, P.; Woensdregt, C.F.; Schmid, Hans

Published inJournal of crystal growth, vol. 100, no. 3, p. 605-614

Publication date1990

Abstract

The structural morphol. of YBa2Cu3O7-x (YBCO) was investigated by application of the periodic bond chain (PBC) theory. For x = 1, the F forms are {001}, {011}, {013}, {112} and {114}. Attachment energies were calcd. in a broken bond model and in an electrostatic point charge model. For x = 1 the theor. growth habit is tabular to platy {001} with {011} as side faces. For x = 0 {010} also becomes an F form. The habit is isometric with large {001} and {011} and small {010} faces. The outermost layer of {001} contains half of the Cu+ (x = 1) or Cu3+ and O2- (x = 0) ions in an ordered arrangement based on a c(2 * 2) quadratic lattice. For the outermost layer of (010) (x = 0) an ordering scheme of the Cu and O ions is proposed. The occurrence of {010} rather than {011} on grown crystals has to be ascribed to external factors.

Keywords

Crystal form
Morphol yttrium barium copper oxide crystal

Affiliation

Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée

Funding

Swiss National Science Foundation - 1989

Citation (ISO format)

SUN, Bing Nan et al. Structural morphology of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub>. In: Journal of crystal growth, 1990, vol. 100, n° 3, p. 605–614.

Article (Published version)

accessLevelRestricted

Identifiers

PID : unige:31411

ISSN of the journal0022-0248

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