Chemical Engineering

Download Developments in Strategic Materials: Ceramic Engineering and by Hua-Tay Lin, Kunihito Koumoto, Waltraud M. Kriven, David P. PDF

By Hua-Tay Lin, Kunihito Koumoto, Waltraud M. Kriven, David P. Norton, Edwin Garcia, Ivar E. Reimanis, Tatsuki Ohji, Andrew Wereszczak

This quantity offers a one-stop source, compiling present study on advancements in strategic fabrics. it's a selection of papers from the yank Ceramic Society s thirty second foreign convention on complex Ceramics and Composites, January 27-February 1, 2008. Papers incorporated during this factor come from 5 symposia: "Thermoelectric fabrics for strength Conversion;" "Basic technology of Multifunctional Ceramics;" "Science of Ceramic Interfaces;" "Geopolymers;" and "Materials for good kingdom Lighting." it is a priceless, updated source for researchers operating within the box.

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Although the ZT figure of merit still remains less than unity, intermetallic compounds seem promising, but transition metal oxides are expected to be more stable in air at high temperature. In a first part chemical bonding in transition metal oxides and its relationship with crystal and electronic structures is discussed. The main part of the paper is devoted to alkali cobaltites A,Co02 and the following questions are considered. How are chemical properties, crystal structure, magnetic and electrical behavior changing with the nature of the A alkali metal?

810 A and c= 14,287 A) and the space group is R-3m. The stacking of the layers is of 0 3 type. 896 A. &oOz exhibits a monoclinic distortion (space group: C2ini) that remains weak. 001. This distortion likely results from an ordering of sodium ions and vacancies'. However. the nature of this ordering has still not been determined. Sodium ions occupy a prismatic site of &f type that is sharing three edges and one face with octaedra of the tm-o sandwiching C o 0 ~layers. 664 A. Na-0 distances also differ depending on whether the oxygen atoms are located on a face (Of type) or an edge (0,type) common to a Coo0 octahedron and a Na06 prism.

The first increase of )ieleJkfor low germanium fractions is mainly linked to the decrease of the electrical resistivity. The ratio exhibits a local maximum for a germanium fraction that increases when x corresponds to the solubility limit. However, it is noteworthy that &icc/h~ increases for high germanium fractions. although the electrical conductivity (and therefore &),I decreases. It means that the germanium additions are more effective in decreasing the phonons mean free path that the charge carriers mobility and are therefore suitable for improving the thermoelectric efficiency.

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