Intrinsic metastability of orthorhombic HfTiO{sub 4} in thin film hafnia-titania
- Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201 (United States)
Orthorhombic (o) HfTiO{sub 4} is crystallized when sputter deposited hafnia-titania nanolaminates with ultrathin layers and bilayer (HfO{sub 2}){sub 0.5}(TiO{sub 2}){sub 0.5} composition are annealed between 573 and 1173 K. However, o-HfTiO{sub 4} demixes after annealing at 1273 K, a result not predicted from bulk thermodynamics. X-ray diffraction and Raman microscopy are used here to study structural changes as o-HfTiO{sub 4} demixes upon long-term annealing at 1273 K into Ti-doped monoclinic HfO{sub 2} and Hf-doped rutile TiO{sub 2}. We conclude that o-HfTiO{sub 4} crystallized at low temperature is intrinsically metastable. A space group symmetry analysis shows that demixing can be accomplished by a continuous phase transition chain.
- OSTI ID:
- 21518270
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 5 Vol. 98; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ALLOYS
ANNEALING
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALLIZATION
DIFFRACTION
DOPED MATERIALS
FILMS
HAFNIUM ADDITIONS
HAFNIUM ALLOYS
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
HEAT TREATMENTS
MATERIALS
MONOCLINIC LATTICES
NANOSTRUCTURES
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RAMAN SPECTRA
REFRACTORY METAL COMPOUNDS
SCATTERING
SPACE GROUPS
SPECTRA
SYMMETRY
SYMMETRY GROUPS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THIN FILMS
TITANATES
TITANIUM ADDITIONS
TITANIUM ALLOYS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
ALLOYS
ANNEALING
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALLIZATION
DIFFRACTION
DOPED MATERIALS
FILMS
HAFNIUM ADDITIONS
HAFNIUM ALLOYS
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
HEAT TREATMENTS
MATERIALS
MONOCLINIC LATTICES
NANOSTRUCTURES
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RAMAN SPECTRA
REFRACTORY METAL COMPOUNDS
SCATTERING
SPACE GROUPS
SPECTRA
SYMMETRY
SYMMETRY GROUPS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THIN FILMS
TITANATES
TITANIUM ADDITIONS
TITANIUM ALLOYS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION