Secondary effects in wide frequency range measurements of the pyroelectric coefficient of Ba0.6Sr0.4TiO3 and PbZr0.2Ti0.8 O3 epitaxial layers

Trong Tong, J. Karthik, Lane W. Martin, David G. Cahill

Research output: Contribution to journalArticle

Abstract

We describe measurements of the pyroelectric coefficient of epitaxial layers of Ba0.6Sr0.4TiO3 (BST) and PbZr0.2Ti0.8O3 (PZT) using a modulated laser as the heat source in the frequency range 1 Hz to 10 MHz. The pyroelectric coefficient is also measured as a function of applied static electric field and for films grown on SrTiO3, DyScO3, and GdScO3 substrates. The heat diffusion equation is solved in cylindrical coordinates for the temperature field in a multilayer sample heated by a Gaussian-shaped laser beam. The secondary contribution to the pyroelectric effect caused by piezoelectric effects and in-plane thermal expansion is revealed by the difference between the pyroelectric coefficients at high and low frequencies. The secondary pyroelectric effect has the same dependence on applied field as the pyroelectric coefficient. The magnitude of the secondary effect changes with heating frequency because of changing mechanical conditions, but the pyroelectric coefficient has no other frequency dependence between 1 Hz and 10 MHz. The secondary effect is approximately 15% and 20% of the total pyroelectric response for PZT and BST films, respectively.

Original languageEnglish (US)
Article number155423
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number15
DOIs
StatePublished - Oct 14 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Secondary effects in wide frequency range measurements of the pyroelectric coefficient of Ba0.6Sr0.4TiO3 and PbZr0.2Ti0.8 O3 epitaxial layers'. Together they form a unique fingerprint.

  • Cite this