Structure and electrical properties of strontium zirconate

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5939929

Suriyayothin, N P

This investigation addresses some of the issues associated with perovskites. First, the different defect disorders in ternary ionic crystals of the type ABO/sub 3/ were considered and defect concentrations as functions of several independent thermodynamic variables were evaluated. This analysis was then applied to interpret the specific case of the electrical behavior of SrZrO/sub 3/. The analysis was next extended to explain the effects of partially and completely ionized foreign atoms, both acceptors and donors, added intentionally or present as impurities to achieve controlled properties. Equilibrium conductivity experiments were performed over a wide range of temperature, oxygen pressure, and dopant concentration and the applicability of point-defect chemistry in solving these results was demonstrated. The range of existence of the homogeneous perovskite phase, SrO-La/sub 2/O/sub 3/-ZrO/sub 3/, within which conductivity measurements were made, was evaluated through a series of experiments involving scanning and transmission electron microscopy and x-ray diffractometry. Thermogravimetric studies, under both oxidizing and reducing conditions, were conducted to understand the self-compensation phenomenon in SrZrO/sub 3/ with dopant additions and a model was proposed to explain the compensation process. Finally, a comprehensive study was made of laser-excited Raman spectral characteristics of undoped zirconates at various temperatures.

• Research Organization: Oregon Graduate Center, Beaverton (USA)
• OSTI ID: 5939929
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CRYSTAL STRUCTURE
ELECTRICAL PROPERTIES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RAMAN SPECTRA
SPECTRA
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONATES
ZIRCONIUM COMPOUNDS