Preparation of KTaO [sub 3]and KNbO [sub 3] solid solutions through sol-gel processing
- Naval Research Lab., Washington, DC (United States)
In this paper, potassium tantalate niobate solid-solution (KTN) powders and thin films are prepared from metallo organic compounds through sol-gel processing. The KTN precursors were chemically modified and then prehydrolyzed with various concentrations of water. The stability of the modified solutions and the effects of prehydrolysis on the crystallization are discussed. Powder gels were obtained by exposing the solution to the atmospheric water, hydrolyzing the solutions. Alternatively, thin films were deposited on fused silica, silicon, sapphire, MgO, and SrTiO[sub 3], using the spinning technique. The pyrolysis and crystallization of KTN powders and films were investigated by differential thermal analysis, thermogravimetric analysis, and X-ray diffraction. The effects of substrate and other processing parameters on the crystal structure of the KTN phases were also investigated. KTN powders crystallized into a perovskite phase regardless of the processing conditions. The crystal structure of the KTN thin films had a strong dependency on the crystal structure of the substrates, while other processing parameters played smaller roles. Pyrochlore KTN was the major phase that crystallized on fused silica and silicon, whereas oriented perovskite KTN was obtained on single-crystal MgO and SrTiO[sub 3].
- OSTI ID:
- 7166003
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:8; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
DISPERSIONS
FABRICATION
FILMS
GRAVIMETRIC ANALYSIS
MINERALS
MIXTURES
NIOBATES
NIOBIUM COMPOUNDS
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
OXYGEN COMPOUNDS
PHASE STABILITY
POTASSIUM COMPOUNDS
PYROCHLORE
QUANTITATIVE CHEMICAL ANALYSIS
REFRACTORY METAL COMPOUNDS
SCATTERING
SOL-GEL PROCESS
SOLID SOLUTIONS
SOLUTIONS
STABILITY
SUBSTRATES
SYNTHESIS
TANTALATES
TANTALUM COMPOUNDS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION