Journal of the Physical Society of Japan · 1983 · 16 citations · 2 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureSolid State PhysicsCrystal ChemistryCrystallographyFerroelectric MaterialsPhase TransitionsX-ray CrystallographyX-ray DiffractionCommensurate-incommensurate TransitionsFerroelectric CrystalsFerroelectric Phase TransitionsFerroelectric PropertiesFerroelectric StructureIncommensurate TransitionsSuperlattice Structure AnalysisX-ray Diffraction Analysis
X-ray diffraction study on the phase transitions in (NH 4 ) 2 ZnBr 4 was made. It was found that the crystal has a new phase between 122°C and 159°C characterized by the incommensurate structure (δ≠0) with the satellite reflections of ( h k l ±(1/4+δ)) type and has the superlattice structure with the ( h k l ±1/3) reflections below the ferroelectric transition point, -56.5°C. The commensurate structure with the ( h k l ±1/4) reflections is observed between 122°C and -56.5°C.
2
Toshiaki Sato, Manabu Endo, Toshio Ôsaka et al. · Journal of the Physical Society of Japan · 1982 · 15 citations