Dipole-glass behavior of lightly doped KTa sub 1 minus x Nb sub x O sub 3

Journal Article · Tue Sep 01 00:00:00 EDT 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.5116· OSTI ID:7177240

Gehring, P M; Chou, H; Shapiro, S M; Hriljac, J A; Chen, D H ^[1]; Toulouse, J ^[2]; Rytz, D ^[3]; Boatner, L A ^[4]

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1. Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States)
2. Department of Physics, Lehigh University, Bethlehem, Pennsylvania 18015 (United States)
3. Centre de Recherche en Optoelectronique, SANDOZ Huningue SA, F-68330 Huningue (France)
4. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 (United States)

High-resolution x-ray diffraction measurements have been performed between 10 and 300 K on several single crystals of KTa{sub 1{minus}{ital x}}Nb{sub {ital x}}O{sub 3} with {ital x}{le}0.157. Contary to the published phase diagram, no deviation from cubic symmetry is seen for {ital x}{le}0.060. Instead, a low-temperatue minimum to the cubic unit cell volume is observed at a temperature {ital T}{sub min} which increases monotonically for 0.012{le}{ital x}{le}0.060. Data for {ital x}=0.157, however, are consistent with the previously established sequence of structural transitions from cubic to tetragonal to orthorhombic to rhombohedral symmetries. We associate {ital T}{sub min} with the onset of a dipolar glass transition. In addition, a radial broadening of the linewidths is observed at {ital T}{sub min}, indicating the presence of strain in the lattice. Powdering small pieces from these single crystals suppresses the unit cell minimum and stabilizes the cubic phase down to 10 K, even for {ital x}=0.157.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 7177240
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:9; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALI METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTALS
DIAGRAMS
DIFFRACTION
DOPED MATERIALS
MATERIALS
MONOCRYSTALS
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
REFRACTORY METAL COMPOUNDS
SCATTERING
TANTALUM COMPOUNDS
TANTALUM OXIDES
TEMPERATURE EFFECTS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION