Grain size effect on structure and properties for chemically-prepared barium titanate

Many reports exist in the literature which indicate that BaTiO$\sb3,$ when prepared as a powder with small particle size ({<}1μm) or as a polycrystalline ceramic with small grain size, displays dramatic deviations in crystal structure and electrical properties, compared with forms involving larger crystallite sizes. Specifically, ceramists have been concerned for decades primarily with three characteristics for BaTiO$\sb3$ which have been reported with decreasing crystallite size to the nano scale: (i) a progression at room temperature from the normally tetragonal structure to one of apparent cubic symmetry, when examined by conventional x-ray diffraction (XRD), (ii) substantially decreasing values of the dielectric constant (K$\sp\prime$) for grain sizes below 0.5μm, and (iii) the concept that ferroelectricity should become unstable below a limiting critical crystallite size. This thesis reports an experimental investigation which substantially clarifies and leads to a plausible explanation of these phenomena for chemically prepared BaTiO$\sb3.$

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Materials Science and Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Frey, Matthew Henry

Contributors dc:contributor

• Payne, David A.

• Physics, Electricity and Magnetism
• Physics, Condensed Matter
• Engineering, Materials Science

Statement dc:rights

• Copyright 1996 Frey, Matthew Henry

Language dc:language

eng

Identifier

9780591198126
AAI9712272
(UMI)AAI9712272

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/18930