Showing papers on "Ferroelasticity published in 1969"

Ferroelasticity of Niobium due to Hydrogen as a Lattice Gas

Abstract: We have measured the elastic response of niobium in the region of the critical point of hydrogen in niobium. The elastic susceptibility exceeds commonly observed values by two or three orders of magnitude and follows a Curie-Weiss relation over the temperature range investigated. The diffusion coefficient of hydrogen shows "critical slowing down" behavior but no anomaly in the transport coefficient.

Considerations of Crystals which are "Antiferroelastic" as well as Paraelectric, Ferroelectric, or Antiferroelectric

Abstract: In a recent paper, “ferroelasticity” has been defined on the analogy of “Ferroelectricity,” mechanical strain and stress in the former corresponding to electric polarization and field in the latter. Just as “antiferroelectricity” is associated with “ferroelectricity.” so is “antiferroelasticity” associated with “ferroelasticity.” It is considered that antiferroelastic crystals are possible. For the purpose of grasping them conceptually and knowing their characteristics and also for the purpose of understanding more deeply ferroelectricity and antiferroelectricity, this paper presents and thermodynamically investigates some model crystals are antiferroelastic as well as paraelectric, ferroelectric, or antiferroelectric.

Fundamentals of Mutual Conversion of Electrical Energy and Mechanical Energy by Simultaneously Ferroelectric and Ferroelastic Crystals

Abstract: The concept "ferroelasticity" is analogous to "ferroelectricity," mechanical strain and stress in the former corresponding to electric polarization and field in the latter. Crystals which are both ferroelectric and ferroelastic can (in principle) be applied to mutual conversion of electrical energy and mechanical energy. A thermodynamic investigation is made into basic problems in this application–domain structure of the crystal element, optimum conditions for conversion, rate of conversion, and others; here the crystal concerned is assumed to be such that the ferroelasticity may phenomenologically be regarded as induced by the ferroelectricity through piezoelectric coupling or, oppositely, such that the ferroelectricity may phenomenologically be regarded as induced by the ferroelasticity through piezoelectric coupling. For the sake of comparison, the case is also considered where a typical, simple piezoelectric crystal is used instead.