HomeAlexander Deyneka

Papers by Author: Alexander Deyneka

Paper TitlePage

Relaxor-Like Behavior of Self-Polarized Pb(Zr,Ti)O₃ Thin Films

Authors: Gunnar Suchaneck, Alexander Deyneka, Lubomir Jastrabik, Gerald Gerlach

Abstract: Self-polarized Pb(Ti,Zr)O3 thin films deposited under lead enriched conditions by multitarget reactive sputtering at low substrate temperatures are characterized by tetravalent B-site occupation of excess lead. The imaginary part of the dielectric constant of such films shows a relaxor-like behavior. Evidence of a Pb2+/Pb4+ mixed valence is given by the temperature and frequency dependence of the ac conductivity. PbO volatility starts to deplete the growing film at a critical temperature of 500°C and Pb4+ formation disappears.

175

Low Pressure RF Plasma Jet Sputtering Technique Applied to Ferroelectric Films: Ba_1-x Sr_xTiO₃

Authors: Alexander Deyneka, Zdenek Hubička, V.A. Trepakov, Gunnar Suchaneck, Lubomir Jastrabik, Gerald Gerlach, Jan Pokorny, Dasgmar Chvostova, J. Olejníček

Abstract: Technology aspects and characterization of BaxSr1-xTiO3 (BST) films fabricated with low pressure plasma jet technique are presented. BST films were deposited on silicon coated with Pt/TiO2/SiO2 and on bare Si substrates. The nozzles-type RF hollow cathode has been fabricated from hot pressed BaTiO3, SrTiO3, and BST ceramics. Controlling of RF voltage, RF current and substrate temperature allowed us to deposit reproducible films with controlled grain size. Hysteresis loops, ellipsometric and micro-Raman investigation results are presented and discussed.

165