Structure of commensurate and incommensurate ordered phases in the system ZrTiO sub 4 -Zr sub 5 Ti sub 7 O sub 24

Journal Article · Sun Mar 01 00:00:00 EST 1992 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb07843.x· OSTI ID:5102219

Christoffersen, R; Davies, P K ^[1]

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1. Dept. of Materials Science and Engineering, Univ. of Pennsylvania, Philadelphia, PA (US)

This paper reports on the low-temperature, Zr-Ti-ordered, form of zirconium titanate that has been investigated using high-resolution transmission electron microscopy in order to characterize the incommensurate structure of phases with compositions Zr-TiO{sub 4} to near Zr{sub 5}Ti{sub 7}O{sub 24}. Electron diffraction reveals that compositions with Zr:Ti between 5:7 and 1:1 have incommensurate superstructures, and phases close to 1:1 are commensurate with an a-axis repeat 2 times that of the disordered structure. High-resolution images show that the a-doubling in ZrTiO{sub 4} corresponds to a new structure, one that consists of two Zr-rich, distorted octahedral layers alternated with two Ti-rich octahedral layers. The incommensurate compositions are composed of blocks of the 1:1 structure intercalated with blocks of the commensurate 5:7 structure, the latter having a tripled a-repeat and a ZTTZTT sequence of cation layers. The intercalation can be described as an interface-modulated structure resulting from the quasiperiodic insertion of (100) faults with displacement vector R = {minus}1/3 a{sub ord} in the ordered 5:7 phase.

• OSTI ID: 5102219
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 75:3; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
74 ATOMIC AND MOLECULAR PHYSICS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Ta
TITANATES
PHASE STUDIES
ZIRCONIUM COMPOUNDS
CERAMICS
DIELECTRIC PROPERTIES
ELECTRON DIFFRACTION
MICROSTRUCTURE
ORDER-DISORDER TRANSFORMATIONS
TRANSMISSION ELECTRON MICROSCOPY
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
MICROSCOPY
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SCATTERING
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties
664400 - Experimentally Derived Information on Atomic & Molecular Properties- (1992-)
661220 - Particle Beam Production & Handling
Targets- (1992-)