Journal ArticleDOI
Electron paramagnetic resonance study of proton dynamics in KH2PO4 - KH2AsO4 mixed crystals
Robert Blinc,P. Cevc +1 more
Reads0
Chats0
TLDR
In this article, the lifetime effects in the proton hyperfine structure of the EPR spectra were used as a detector of proton motion, and the change in the frequency of exchange between the various “Slater” H 2 AsO 4 arrangements with the Curie temperature for a series of paraelectric γ -irradiated KH 2 PO 4 - KH 2 O 4 mixed crystals were studied.About:
This article is published in Solid State Communications.The article was published on 1968-09-01. It has received 19 citations till now. The article focuses on the topics: Curie temperature & Electron paramagnetic resonance.read more
Citations
More filters
Theory of Ferroelectric Phase Transition in KHzP04 Type Crystals. I
TL;DR: In this article, a theory of the phase transi- tion is developed under the assumption that the ferroelectric behavior of this substance is due to cooperation of the ionic displacements, the interactions between ions and protons and the tunneling motion of protons.
Journal ArticleDOI
Defect-dipole alignment and tetragonal strain in ferroelectrics
TL;DR: In this article, the alignment of defect dipoles along the direction of the spontaneous polarization in polycrystalline Pb(Zr,Ti)O3 and BaTiO3 ferroelectric ceramics using electron paramagnetic resonance (EPR) was demonstrated via orientation dependent paramagnetic centers in the poly crystalstalline materials and computer modeling of the EPR line shapes.
Journal ArticleDOI
ESR Study of γ-Irradiated K2SeO4
TL;DR: In this paper, structural phase changes in K 2 SeO 4 have been found at 129.5°K and 93°K by introducing free radical SeO4 -as a probe.
Journal ArticleDOI
Electron Paramagnetic Resonance Studies of X‐Irradiated KH2AsO4, KD2AsO4, RbH2AsO4, RbD2AsO4, CsH2AsO4, NH4H2AsO4, and ND4D2AsO4 (Ferroelectrics and Antiferroelectrics)
Abstract: Electron paramagnetic resonance (EPR) studies of defect centers produced by x or γ irradiation of the hydrogen‐bonded ferroelectrics KH2AsO4, KD2AsO4, RbH2AsO4, RbD2AsO4, and CsH2AsO4 and of the antiferroelectrics NH4H2AsO4 and ND4D2AsO4, are presented. The spectra, observed over 300–4.2°K, are characterized by a very large hyperfine interaction of the unpaired electron with the 75As (I=32) nucleus, and exhibit orthorhombic symmetry in general. The analysis thus required an exact diagonalization of the spin Hamiltonian. Such a procedure, coupled with the use of the method of least‐squares adjustment, has resulted in accurate values for the hyperfine parameters describing the observed spectra, both for single crystal and powder samples. A comparison of the hyperfine parameters with those reported previously for the AsO44− in KH2AsO4 has enabled us to identify lines from this center in all the above crystals. The parameters are found to be sensitive to change of the cation and also to a variation of the sam...
Journal ArticleDOI
Electron paramagnetic resonance and electron nuclear double resonance of the AsO44- centre in X-irradiated KH2AsO4
TL;DR: In this paper, the symmetry of the spin-hamiltonian has been found to be orthorhombic, and the g tensor and A tensor describing the interaction of the unpaired electron with the arsenic nucleus (I = 3/2) have been obtained.
References
More filters
Journal ArticleDOI
Collective motions of hydrogen bonds
TL;DR: In this article, the low frequency collective modes of protons are calculated for ferrroelectric crystals of the KH 2 PO 4 type taking into account the tunneling frequency and a simplified interaction between proton sites.
Journal ArticleDOI
Dynamical Theory of the Phase Transition in KH2PO4-Type Ferroelectric Crystals
TL;DR: In this paper, the ferroelectric phase transition in [K-PO 4 ]-type crystals is explained by the coupling between the proton tunneling mode and the optical mode vibration of the complexes along the c-axis.
Journal ArticleDOI
Theory of Ferroelectric Phase Transition in KH2PO4 Type Crystals. I
Theory of Ferroelectric Phase Transition in KHzP04 Type Crystals. I
TL;DR: In this article, a theory of the phase transi- tion is developed under the assumption that the ferroelectric behavior of this substance is due to cooperation of the ionic displacements, the interactions between ions and protons and the tunneling motion of protons.
Related Papers (5)
Electron Paramagnetic-Resonance and Electron-Nuclear Double-Resonance Observations of Domains in the Irradiated Ferroelectrics KH 2 AsO 4 and KD 2 AsO 4
Detection of Electron Paramagnetic Resonance and Electron-Nuclear Double Resonance the Proton-Lattice Coupled Mode in KH 2 AsO 4 , KD 2 AsO 4 , and NH 4 H 2 AsO 4 (Ferroelectrics and Antiferroelectrics)
N. S. Dalal,C. A. McDowell +1 more