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Author Borkar, Hitesh ♦ Barvat, Arun ♦ Pal, Prabir ♦ Kumar, Ashok ♦ Shukla, A. K. ♦ Pulikkotil, J. J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ ACTIVATION ENERGY ♦ ANIONS ♦ DIELECTRIC MATERIALS ♦ DISPERSIONS ♦ ELECTRON DENSITY ♦ ELECTRONS ♦ GRAIN BOUNDARIES ♦ HYDROXIDES ♦ OXYGEN ♦ OXYGEN IONS ♦ PERMITTIVITY ♦ PHASE TRANSFORMATIONS ♦ PHONONS ♦ PHOTOELECTRON SPECTROSCOPY ♦ PHOTOEMISSION ♦ POLARONS ♦ PROTONS ♦ SILICON ♦ TEMPERATURE RANGE 0400-1000 K ♦ ZIRCONIUM OXIDES
Abstract The SrZrO{sub 3} is a well known high-k dielectric constant (∼22) and high optical bandgap (∼5.8 eV) material and one of the potential candidates for future generation nanoelectronic logic elements (8 nm node technology) beyond silicon. Its dielectric behavior is fairly robust and frequency independent till 470 K; however, it suffers a strong small-polaron based electronic phase transition (T{sub e}) linking 650 to 750 K. The impedance spectroscopy measurements revealed the presence of conducting grains and grain boundaries at elevated temperature which provide energetic mobile charge carriers with activation energy in the range of 0.7 to 1.2 eV supporting the oxygen ions and proton conduction. X-ray photoemission spectroscopy measurements suggest the presence of weak non-stoichiometric O{sup 2−} anions and hydroxyl species bound to different sites at the surface and bulk. These thermally activated charge carriers at elevated temperature significantly contribute to the polaronic based dielectric anomaly and conductivity. Our dielectric anomaly supports pseudo phase transition due to high degree of change in ZrO{sub 6} octahedral angle in the temperature range of 650–750 K, where electron density and phonon vibration affect the dielectric and conductivity properties.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-06-07
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 119
Issue Number 21


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