Effect of alkaline earth oxides on the formation of surface microphases that protect strontium titanate from reduction

Journal Article · Wed Aug 20 00:00:00 EDT 1986 · J. Appl. Chem. USSR (Engl. Transl.); (United States)

OSTI ID:6198223

Aksenova, L A; Kostikov, Yu P; Leonov, A I; Rotenberg, B A; Strykanov, V S

The authors studied the effect of addition of strontium oxide, barium oxide, and calcium oxide on the formation of surface microphases and the reduction of strontium titanate. The materials were strontium carbonate, barium carbonate, and calcium carbonate (analytical grade) and titanium dioxide (pure grade). X-ray diffraction analysis was carried out on a DRON-2.0 diffractometer (CuK/sub ..cap alpha../, Ni filter). The surface layers were studies in an electron spectrometer by ESCA (exciting irradiation Al/sub K..cap alpha../; bond energy in standard gold sample Au/sub 4/f/sub 1/2/ = 84.1 eV; depth of layer 8 nm). Samplers were prepared according to the usual ceramic technology. It was found that protection from reduction of strontium titanate that is doped with calcium, strontium, or barium oxide is related to the formation of surface microphases that are close to M/sub 2/TiO/sub 4/ in composition and do not undergo reduction when calcined in a medium at low partial pressure of oxygen.

• OSTI ID: 6198223
• Journal Information: J. Appl. Chem. USSR (Engl. Transl.); (United States), Vol. 59:2; Other Information: Translated from Zh. Prikl. Khim.; 59: No. 2, 252-255(Feb 1986)
• Country of Publication: United States
• Language: Russian

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM OXIDES
METALLURGICAL EFFECTS
CALCIUM OXIDES
STRONTIUM OXIDES
STRONTIUM TITANATES
CRYSTAL DOPING
PHASE STUDIES
PROTECTIVE COATINGS
REDUCTION
CALCINATION
CERAMICS
COMPARATIVE EVALUATIONS
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
ELECTRIC CONDUCTIVITY
ELECTRICAL INSULATORS
ELECTRON SPECTRA
INHIBITION
LATTICE PARAMETERS
SOLID SOLUTIONS
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COATINGS
COHERENT SCATTERING
DECOMPOSITION
DIFFRACTION
DISPERSIONS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
EQUIPMENT
MATERIALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PYROLYSIS
SCATTERING
SOLUTIONS
SPECTRA
STRONTIUM COMPOUNDS
THERMOCHEMICAL PROCESSES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360205 - Ceramics
Cermets
& Refractories- Corrosion & Erosion
400201 - Chemical & Physicochemical Properties