Bulk- and electrode-limited conduction mechanisms in different phases of Mn2+-doped potassium tetrachlorozincate crystal

GAFFAR, M. A ; ABOUSEHLY, A. M ; et al.

In: Journal of physics. D, Applied physics (Print), Jg. 38 (2005), Heft 4, S. 577-583

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The current density-electric field intensity relationship of pre-heated potassium tetrachlorozincate (KZC) crystals (undoped and doped with Mn2+ in different concentrations) has been measured along the polar a-axis. The dependence was studied at selected temperatures covering the three high-temperature phases of KZC in order to investigate the type of conduction mechanism dominating in each phase. The original Richardson-Schottky (R-S) equation shows disagreement between calculated and experimental values of the Richardson and optical dielectric constants. The modified R-S equation fits the data well and facilitated the calculation of the barrier height, electronic mobility and high-frequency dielectric constant of KZC. The calculated parameters are in good agreement with the corresponding experimental values. The results indicated that the bulk- and electrode-limited mechanisms contribute to conduction in different phases of KZC. The temperature dependence of the dc conductivity along the polar axis of undoped and Mn2+-doped KZC shows anomalous behaviour in the region of the phase transitions. The dc conductivity and the activation energy of conduction (w) changed significantly due to doping. As indicated by the extremely high w values, superionic conduction is the dominating mechanism in the high-temperature part of the incommensurate (IC) and normal phases of KZC. Suppression of the superionic conduction by Mn2+-doping is observed. The effect of discommensurate pinning by Mn2+ ions and the possibility of dislocation formation on the dc conduction in the IC phase is also discussed.

Titel:	Bulk- and electrode-limited conduction mechanisms in different phases of Mn2+-doped potassium tetrachlorozincate crystal
Autor/in / Beteiligte Person:	GAFFAR, M. A ; ABOUSEHLY, A. M ; EL-FADL, A. Abu ; MOSTAFA, M. M
Link:	Full Text Finder (Volltext) E-Journal im Bestand der UB Hagen? View record from PASCAL Archive
Zeitschrift:	Journal of physics. D, Applied physics (Print), Jg. 38 (2005), Heft 4, S. 577-583
Veröffentlichung:	Bristol: Institute of Physics, 2005
Medientyp:	academicJournal
Umfang:	print, 34 ref
ISSN:	0022-3727 (print)
Schlagwort:	Condensed state physics Physique de l'état condensé Physics Physique Plasma physics Physique des plasmas Sciences exactes et technologie Exact sciences and technology Etat condense: structure electronique, proprietes electriques, magnetiques et optiques Condensed matter: electronic structure, electrical, magnetic, and optical properties Transport électronique Electronic transport in condensed matter Conductivité mixte et transitions entre différents modes de conductivité Mixed conductivity and conductivity transitions Propriétés et matériaux diélectriques, piézoélectriques et ferroélectriques Dielectrics, piezoelectrics, and ferroelectrics and their properties Propriétés diélectriques des solides et des liquides Dielectric properties of solids and liquids Permittivité (fonction diélectrique) Permittivity (dielectric function) Addition manganèse Manganese additions Composé ternaire Ternary compounds Conduction ionique Ionic conduction Conducción iónica Conductivité superionique Superionic conductivity Conductivité électrique Electrical conductivity Constante diélectrique Permittivity Dopage Doping Effet champ électrique Electric field effects Effet température Temperature effects Energie activation Activation energy Hauteur barrière Barrier height Impureté Impurities Métal transition composé Transition element compounds Potassium chlorure Potassium chlorides Transformation phase Phase transformations Zinc chlorure Zinc chlorides 7722C Time: 7260
Sonstiges:	Nachgewiesen in: PASCAL Archive Sprachen: English Original Material: INIST-CNRS Document Type: Article File Description: text Language: English Author Affiliations: Physics Department, School of Science and Engineering, The American University in Cairo, Cairo 11511, Egypt ; Physics Department, Faculty of Science, Al-Azhar University, 71524 Assiut, Egypt ; Physics Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt Rights: Copyright 2005 INIST-CNRS ; CC BY 4.0 ; Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS Notes: Physics of condensed state: electronic structure, electrical, magnetic and optical properties

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