Ferroelectric potassium niobate thin films
We report on the first ferroelectric measurements of chemically prepared KNbO/sub 3/ thin films. Polycrystalline KNbO/sub 3/ thin films were fabricated by dip coating substrates with methanolic solutions of potassium hydroxide and niobium ethoxide. Perovskite KNbO/sub 3/ was obtained for both bulk gels and films by using 800/degree/C firing treatments. For films, the intermediate temperature processing schedule was critical for the complete conversion of low temperature phases to perovskite KNbO/sub 3/. Raman spectroscopy and x-ray diffraction analysis confirmed that properly processed films possessed the orthorhombic distortion of the perovskite structure at room temperature. In response to a 1 kHz, sinusoidal field of 300 kV/cm amplitude, we measured the following ferroelectric properties: (1) a remanent polarization of 4.5 ..mu..C/cm/sup 2/, (2) a spontaneous polarization of 8.3 ..mu..C/cm/sup 2/, and (3) a coercive field of 55 kV/cm.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6182768
- Report Number(s):
- SAND-89-0951C; CONF-890421-5; ON: DE89010862
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
DEPOSITION
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
FERROELECTRIC MATERIALS
FILMS
HEAT TREATMENTS
HYDROGEN COMPOUNDS
HYDROXIDES
MINERALS
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
RAMAN SPECTRA
REFRACTORY METAL COMPOUNDS
SOL-GEL PROCESS
SPECTRA
SUBSTRATES
THIN FILMS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS