Journal ArticleDOI
Pressure and temperature dependences of the ionic conductivities of the thallous halides TlCl, TlBr, and TlI
TLDR
In this article, the lattice volume relaxations and energies associated with the formation and motion of Schottky defects in TlCl and TlBr have been determined and the association energy of Tl/sup +/ vacancies and divalent impurities was also determined.Abstract:
Detailed studies of the pressure and temperature dependences of the ionic conductivities of TlCl and TlBr have allowed determination of the lattice volume relaxations and energies associated with the formation and motion of Schottky defects in these crystals. The volume relaxations deduced from the conductivity are found to be comparable in magnitude with values calculated from the strain energy model and a dynamical model. The association energy of Tl/sup +/ vacancies and divalent impurities was also determined for TlBr. A particularly important result is the finding that for these CsCl-type crystals the relaxation of the lattice associated with vacancy formation is outward. Earlier studies on ionic crystals having the NaCl structure have yielded a similar result. This outward relaxation thus appears to be a general result for ionic crystals of both the NaCl and CsCl types (and possibly other ionic lattice types), in disagreement with earlier theoretical calculations which show that the relaxation should be inward for all models of ionic vacancies investigated. The conductivity of TlI was studied in both the (low temperature and pressure) orthorhombic phase as well as in the cubic CsCl-type phase. There is a large electronic contribution to the conductivity in the orthorhombic phase. Anmore » interesting result for all three materials is the observation in the cubic phase of a pressure-induced transition from ionic to electronic conduction. This is in qualitative agreement with what is known about the pressure dependences of the electronic structure of these materials.« lessread more
Citations
More filters
Journal ArticleDOI
A method for suppressing polarization phenomena in TlBr detectors
TL;DR: In this paper, no polarization phenomena were observed in TlBr detectors at room temperature for 30h by applying Tl electrodes to the detectors, and no polarization was observed in the detectors at all.
Journal ArticleDOI
Laboratory studies of the electrical conductivity of silicate perovskites at high pressures and temperatures
Xiaoyuan Li,Raymond Jeanloz +1 more
TL;DR: In this article, the electrical conductivities of two silicate perovskites and a perovsite-magnesiowuestite assemblage, all having an atomic ratio of Mg to Fe equal to 0.88/0.12, were measured with alternating current and direct current (dc) techniques at simultaneously high pressures and temperatures.
Journal ArticleDOI
Polarization Phenomena in TlBr Detectors
TL;DR: In this paper, a comparison of long-term stabilities of TlBr detectors with Au and Tl electrodes was performed in order to reveal polarization phenomena in TlBR detectors.
Book ChapterDOI
High-Pressure Studies of Ionic Conductivity in Solids
TL;DR: A review of high-pressure studies of ionic conductivity in solids can be found in this paper, where the authors present a brief theoretical background with some of the concepts and results necessary for the analysis and interpretation.
Journal ArticleDOI
Degradation effects in TlBr single crystals under prolonged bias voltage
TL;DR: In this article, the electrical properties of TlBr purified by hydrothermal annealing in pure water were studied by I-V, capacitance and photocurrent measurements using Ti-electrodes which were deposited by electronbeam evaporation.
References
More filters
Journal ArticleDOI
Electronic Polarizabilities of Ions in Crystals
TL;DR: In this paper, a set of electronic polarizabilities has been obtained from a least-squares fit of experimental refraction data using simple additivity and a Lorentz factor of $\frac{4\ensuremath{\pi}}{3}$.
Journal ArticleDOI
Pressure and temperature dependences of the ionic conductivities of cubic and orthorhombic lead fluoride (PbF2)
TL;DR: In this article, a detailed study of the effects of temperature and hydrostatic pressure on the ionic conductivity of PbF 2 in both the cubic (Fm3m-O h 5 ) and orthorhombic (Pmnb-V 2 h 16 ) phases was performed with some emphasis on the changes in conductivity accompanying the transition between two phases.
Journal ArticleDOI
Pressure Dependence of Ionic Conductivity in KCl, NaCl, KBr, and NaBr
D. N. Yoon,David Lazarus +1 more
TL;DR: In this article, a detailed analysis of the ionic conductivity of KCl, NaCl, KBr, and NaBr has been carried out, including contributions from anions and extrinsic cation vacancies.
Journal ArticleDOI
Temperature and Pressure Dependence of the Dielectric Constants of the Thallous Halides
TL;DR: In this article, the effects of temperature (76-400\ifmmode^\circ\else\text degree\fi{}K) and hydrostatic pressure (up to 20 kbar) on the static dielectric constants of single crystal TlCl and TlBr and polycrystalline TlI were investigated.
Journal ArticleDOI
Polymorphism, compressibility and thermal expansion of thallous iodide☆
TL;DR: In this article, the authors studied the transition of TlI from a layer orthorhombic (Cmcm) structure to a cubic CsCl-type structure with increasing temperature and/or pressure.