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Crystal structure and phase transitions of sodium potassium niobate perovskites
- Source :
- Solid State Sciences. 11:320-324
- Publication Year :
- 2009
- Publisher :
- Elsevier BV, 2009.
-
Abstract
- This paper presents the crystal structure and the phase transitions of K x Na 1− x NbO 3 (0.4 ≤ x ≤ 0.6). X-ray diffraction measurements were used to follow the change of the unit-cell parameters and the symmetry in the temperature range 100–800 K. At room temperature all the compositions exhibited a monoclinic metric of the unit cell with a small monoclinic distortion (90.32° ≤ β ≤ 90.34°). No major change of symmetry was evidenced in the investigated compositional range, which should be characteristic of the morphotropic phase-boundary region. With increasing temperature, the samples underwent first-order monoclinic–tetragonal and tetragonal–cubic transitions. Only the potassium-rich phases were rhombohedral at 100 K.
- Subjects :
- Diffraction
Phase transition
Potassium niobate
Materials science
General Chemistry
Crystal structure
Atmospheric temperature range
Condensed Matter Physics
Crystallography
chemistry.chemical_compound
chemistry
X-ray crystallography
General Materials Science
Natural bond orbital
Monoclinic crystal system
Subjects
Details
- ISSN :
- 12932558
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Solid State Sciences
- Accession number :
- edsair.doi...........4dc36fd23f185def19c5f3c09be8a48d