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

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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

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rangefinding
Epitaxial layers
frequency ranges
Piezoelectricity
coefficients
Laser beams
Thermal expansion
Multilayers
Temperature distribution
Electric fields
Heating
Lasers
Substrates
cylindrical coordinates
heat sources
thermal expansion
temperature distribution
Hot Temperature
laser beams
low frequencies

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

@article{620192909ba545c4a209a06b5cba837c,
title = "Secondary effects in wide frequency range measurements of the pyroelectric coefficient of Ba0.6Sr0.4TiO3 and PbZr0.2Ti0.8 O3 epitaxial layers",
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.",
author = "Trong Tong and J. Karthik and Martin, {Lane W.} and Cahill, {David G}",
year = "2014",
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doi = "10.1103/PhysRevB.90.155423",
language = "English (US)",
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journal = "Physical Review B-Condensed Matter",
issn = "0163-1829",
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T1 - Secondary effects in wide frequency range measurements of the pyroelectric coefficient of Ba0.6Sr0.4TiO3 and PbZr0.2Ti0.8 O3 epitaxial layers

AU - Tong, Trong

AU - Karthik, J.

AU - Martin, Lane W.

AU - Cahill, David G

PY - 2014/10/14

Y1 - 2014/10/14

N2 - 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.

AB - 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.

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