Metal-Insulator Transitions in CuInGaO4 and CuIn2Ga2O7 Homogeneous Phases

Abstract

The compounds CuInGaO₄ and CuIn₂Ga₂O₇ crystallize in the (LnFeO₃)_nFeO layer structure. In this paper, the electrical properties of CuInGaO₄ and CuIn₂Ga₂O₇ ceramics prepared by solid-state synthesis were examined. Both compounds exhibited a dramatic change in physical properties across a second-order phase transition at 226 K identified by calorimetry experiments. Above this temperature, the conductivity increased over four orders of magnitude and the relative permittivity increased and became strongly dispersive. These observations are explained on the basis of a hole-hopping mechanism in the Cu layers within the (LnFeO₃)_nFeO cystal structure.

Keywords: Ceramics, Electrical properties, Electroceramics, Semiconductors

Corresponding author: E-mail: naratipcmu@yahoo.com

How to Cite

Citation Format

Vittayakorn*, N. ., & Cann, D. P. . (2018). Metal-Insulator Transitions in CuInGaO4 and CuIn2Ga2O7 Homogeneous Phases. CURRENT APPLIED SCIENCE AND TECHNOLOGY, 576-581.

References

Kimizuka, N. and Takayama, E. 1984 The phase relations in the In2O3---A2O3---BO systems at elevated temperatures [A: Fe or Ga, B: Cu or Co] Journal of Solid State Chemistry. 53, 217.
Kato, K., Kawada, I., Kimizuka, N. and Katsura, T. 1975 Crystal structure of ytterbium ferrate (YbFe2O4) Zeitschrift fuer Kristallographie, Kristallgeometrie, Kristallphysik, Kristallchemie 141, 314.
Malaman, B., Evradrd, O., Tannieʹres, N., Courtois, A. and Protas J. 1976 Crystal structure of the phase Yb2Fe3O7 Acta Crystallographica, Section B (Structural Crystallography and Crystal Chemistry) 32, 749.
Roesler, A., Reinen, D. and Anorg, Z. 1981 Cu2+ in trigonal-bipyramidaler Koordination: Die Struktur des CuGaInO4 Zeitschrift für anorganische und allgemeine Chemie 479, 119.
Tanaka, M., Akimitsu, J., Inada, Y., Kimizuka, N., Shindo, I. and Siratori K. 1982 Conductivity and specific heat anomalies at the low temperature transition in the stoichiometric YFe2O4. Solid State Communication 44, 687.

Author Information

Naratip Vittayakorn*

Department of Chemistry, Faculty of Science, King Mongkut’s Institute of Technology LadKrabang, Bangkok, Thailand.

David P. Cann

Faculty of Materials Science, Department of Mechanical Engineering, Oregon State University, USA

About this Article

Journal

Vol. 6 No. 2b (2006)

Type of Manuscript

Original Research Article

Keywords

Ceramics, Electrical properties, Electroceramics, Semiconductors

Published

30 March 2018

Metal-Insulator Transitions in CuInGaO4 and CuIn2Ga2O7 Homogeneous Phases

Abstract

How to Cite

References

Author Information

Naratip Vittayakorn*

David P. Cann

About this Article

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Type of Manuscript

Keywords

Published

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