Journal ArticleDOI
Direct current conduction in ammonium and potassium dihydrogen phosphate
L. B. Harris,G. J. Vella +1 more
TLDR
In this article, the enthalpy of defect migration in KDP and ADP was shown to be 0.53 eV and 0.46 eV, respectively, in both cases.Abstract:
Experiment, plus critical discussion of previous work, suggests the following. Conductivity is primarily due to the migration of L defects (proton vacancies), the enthalpy for L‐defect mobility being 0.53 eV in KDP and 0.46 eV in ADP. Such L defects are produced by impurities, but there is an additional tendency towards incipient decomposition in both crystals. This leads to a high‐temperature conductivity which, in KDP, is associated with the formation of water molecules and the thermal generation of L defects and, in ADP, with the formation of ammonia molecules and the thermal generation of proton vacancies in the ammonium lattice (A defects). The enthalpy of L‐defect formation in KDP is 0.46 eV; that for A‐defect formation in ADP is 0.19 eV. Previously reported overheating effects are spurious. The conductivity is independent of field.read more
Citations
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Journal ArticleDOI
Growth Conditions and Electric Properties of KDP Crystals. I. Conductivity Measurements
TL;DR: In this paper, the dependence of the conductivity parameters on sectorial structure and impurity composition of KDP crystals has been established and the data obtained lead to a conclusion on the formation of the real structure important for various electro-optical applications.
Journal ArticleDOI
A time-resolved luminescence spectroscopy study of self-trapped excitons in NH4H2PO4 crystals
TL;DR: A complex investigation of the dynamics of electronic excitations and luminescence in nonlinear optical crystals of ammonium dihydrophosphate NH4H2PO4 was performed using low-temperature vacuum ultraviolet luminecence spectroscopy with time resolution upon selective photoexcitation by synchrotron radiation as discussed by the authors.
Journal ArticleDOI
Protonic conduction in totally deuterated ammonium dihydrogen phosphate
TL;DR: In this article, the conductivity of deuterated ammonium dihydrogen phosphate single crystals was measured as a function of temperature and the results parallel those for NH4H2PO4 to the extent that defects in the hydrogen-bond network give rise to the conductivities.
Journal ArticleDOI
Proton transport mechanism in ammonium dihydrogen phosphate
Suresh Chandra,S. A. Hashmi +1 more
TL;DR: In this paper, transient ionic current, electrical conductivity and IR investigations on polycrystalline and single crystal of ammonium dihydrogen phosphate (ADP) have been carried out.
Journal ArticleDOI
Some temperature dependent properties of potassium dihydrogen phosphate
TL;DR: In this paper, the activation energy of rotation of the phosphate group was estimated for the temperature dependent region of the resistivity curve and the effect of increasing gamma dose on the number and intensity of glow peaks was investigated.
References
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Piezoelectric Crystals and Their Applications to Ultrasonics
Warren P. Mason,Hans Baerwald +1 more
TL;DR: Piezoelectric crystals and their application to ultrasonics were discussed in this paper, where the authors proposed a method for the extraction of the ultrasonic properties of these crystals.
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