Article

Optical Properties of Lead-Free NKN Films from Transmission and Spectral Ellipsometry

Ferroelectrics

R. Schwarz; L. Santos; A. Kholkin — 2013 — TAYLOR & FRANCIS LTD, 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND

Key information

Authors:

R. Schwarz (Reinhard Horst Schwarz); L. Santos (Luís Filipe da Silva dos Santos); R. Ayouchi (Rachid Ayouchi); S. R. Bhattacharyya; U. V. Mardolcar (Umesh Vinaica Mardolcar); M. Leal; A. Kholkin

Published in

January 2013

Abstract

Thin films of lead-free NaxK1-xNbO3 (NKN) were prepared by pulsed laser deposition (PLD) from ceramic targets of stoichiometric NKN or doped with 6% of lithium niobate (LN). At a deposition temperature of 600 degrees C a strong dependence of film morphology on laser fluence is revealed by SEM microscopy. Optical properties like band gap and index of refraction were obtained through transmission measurements and analysis based on the Tauc model. The results were compared to spectral ellipsometry using a fit to the Tauc-Lorentz model, and slightly smaller band gap values were obtained. C-V characteristics of sandwich structures yielded high permittivity of 380 in pure NKN films and tunability at 1kHz of 3.2% at 1.5 MV/m applied electric field.

Publication details

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Publisher

TAYLOR & FRANCIS LTD, 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND

Title of the publication container

Ferroelectrics

First page or article number

118

Last page

127

Volume

446

Issue

1

Fields of Science and Technology (FOS)

physical-sciences - Physical sciences

Publication language (ISO code)

eng - English

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