Accession Number : ADA293556
Title : Poisson's Ratio for Hexagonal Crystals.
Descriptive Note : Technical rept.,
Corporate Author : ARMY RESEARCH LAB FORT MONMOUTH NJ
Personal Author(s) : Ballato, Arthur
PDF Url : ADA293556
Report Date : MAR 1995
Pagination or Media Count : 13
Abstract : General expressions for Poisson's ratio are derived for hexagonal crystals; simplified forms are given for cases involving symmetry directions. Crystals of hexagonal symmetry include a number of the binary semiconductor systems with the piezoelectric wurtzite structure, such as GaN and AlN. These are becoming increasingly important for high technology applications. One of the most important representatives of this class is the family of poled electroceramics, including BaTiO3, PZT, and related alloys. All hexagonal classes have the same elastic matrix scheme, so for our purposes it is not necessary to distinguish between the different point groups; the presence of piezoelectricity is neglected. jg
Descriptors : *CRYSTALS, *POISSON RATIO, STRUCTURES, ZINC SULFIDES, SEMICONDUCTORS, ALLOYS, CERAMIC MATERIALS, SYMMETRY, PIEZOELECTRIC MATERIALS, BARIUM, TITANATES, ZIRCONATES, LEAD(METAL), BINARY COMPOUNDS.
Subject Categories : Crystallography
Ceramics, Refractories and Glass
Properties of Metals and Alloys
Quantum Theory and Relativity
Solid State Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE