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Title: Enhanced pyroelectric properties of Bi1-x La x FeO 3 thin films

Abstract

There is growing interest in the study of thin-film pyroelectric materials because of their potential for high performance thermal-energy conversion, thermal sensing, and beyond. Electrothermal susceptibilities, such as pyroelectricity, are known to be enhanced in proximity to polar instabilities, and this is conventionally accomplished by positioning the material close to a temperature-driven ferroelectric-to-paraelectric phase transition. The high Curie temperature (TC) for many ferroelectrics, however, limits the utility of these materials at room-temperature. Here, the nature of pyroelectric response in thin films of the widely studied multiferroic Bi1-xLaxFeO3 (x = 0-0.45) is probed. While BiFeO3 itself has a high TC, lanthanum substitution results in a chemically induced lowering of the ferroelectric-to-paraelectric and structural-phase transition. The effect of isovalent lanthanum substitution on the structural, dielectric, ferroelectric, and pyroelectric response is investigated using reciprocal-space-mapping studies; field-, frequency-, and temperature-dependent electrical measurements; and phase-sensitive pyroelectric measurements, respectively. While BiFeO3 itself has a rather small pyroelectric coefficient at room temperature (~-40 μC/m2 K), 15% lanthanum substitution results in an enhancement of the pyroelectric coefficient by 100% which is found to arise from a systematic lowering of TC.

Authors:
ORCiD logo [1];  [2];  [3];  [3];  [3];  [3];  [1]; ORCiD logo [1]
+ Show Author Affiliations
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1619136
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 7; Journal Issue: 11; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Multiferroics; Ferroelectric materials; Heterostructures; Thin films; Energy conversion; Dielectric materials; Pyroelectricity

Citation Formats

Zhang, Lei, Huang, Yen-Lin, Velarde, Gabriel, Ghosh, Anirban, Pandya, Shishir, Garcia, David, Ramesh, Ramamoorthy, and Martin, Lane W. Enhanced pyroelectric properties of Bi1-x La x FeO 3 thin films. United States: N. p., 2019. Web. doi:10.1063/1.5128413.
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Zhang, Lei, Huang, Yen-Lin, Velarde, Gabriel, Ghosh, Anirban, Pandya, Shishir, Garcia, David, Ramesh, Ramamoorthy, & Martin, Lane W. Enhanced pyroelectric properties of Bi1-x La x FeO 3 thin films. United States. https://doi.org/10.1063/1.5128413
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Zhang, Lei, Huang, Yen-Lin, Velarde, Gabriel, Ghosh, Anirban, Pandya, Shishir, Garcia, David, Ramesh, Ramamoorthy, and Martin, Lane W. Fri . "Enhanced pyroelectric properties of Bi1-x La x FeO 3 thin films". United States. https://doi.org/10.1063/1.5128413. https://www.osti.gov/servlets/purl/1619136.
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@article{osti_1619136,
title = {Enhanced pyroelectric properties of Bi1-x La x FeO 3 thin films},
author = {Zhang, Lei and Huang, Yen-Lin and Velarde, Gabriel and Ghosh, Anirban and Pandya, Shishir and Garcia, David and Ramesh, Ramamoorthy and Martin, Lane W.},
abstractNote = {There is growing interest in the study of thin-film pyroelectric materials because of their potential for high performance thermal-energy conversion, thermal sensing, and beyond. Electrothermal susceptibilities, such as pyroelectricity, are known to be enhanced in proximity to polar instabilities, and this is conventionally accomplished by positioning the material close to a temperature-driven ferroelectric-to-paraelectric phase transition. The high Curie temperature (TC) for many ferroelectrics, however, limits the utility of these materials at room-temperature. Here, the nature of pyroelectric response in thin films of the widely studied multiferroic Bi1-xLaxFeO3 (x = 0-0.45) is probed. While BiFeO3 itself has a high TC, lanthanum substitution results in a chemically induced lowering of the ferroelectric-to-paraelectric and structural-phase transition. The effect of isovalent lanthanum substitution on the structural, dielectric, ferroelectric, and pyroelectric response is investigated using reciprocal-space-mapping studies; field-, frequency-, and temperature-dependent electrical measurements; and phase-sensitive pyroelectric measurements, respectively. While BiFeO3 itself has a rather small pyroelectric coefficient at room temperature (~-40 μC/m2 K), 15% lanthanum substitution results in an enhancement of the pyroelectric coefficient by 100% which is found to arise from a systematic lowering of TC.},
doi = {10.1063/1.5128413},
journal = {APL Materials},
number = 11,
volume = 7,
place = {United States},
year = {2019},
month = {11}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5128413
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Cited by: 12 works
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Figures / Tables:

Fig. 1 Fig. 1: (a) A schematic illustration of the device structure wherein ac current at frequency ω is applied to the platinum heater line on top of the BiFeO3 thin film that is sandwiched by SrRuO3 electrodes resulting in a pyroelectric current at the frequency of 2ω collected by the bottommore » electrode. (b) Temperature oscillation (θFE, left axis) and thermal phase (right axis) in the ferroelectric layer are measured by the voltage at a frequency of 3ω using the 3ω method as a function of heating current frequency (ω). (c) Pyroelectric current (left axis) and thermal phase (right axis) for the BiFeO3 heterostructures as a function of heating current frequency at zero dc bias (the gray area denotes a regime wherein spurious in-phase current is prevalent; it is found to significantly increase as the frequency of measurement decreases). (d) Pyroelectric coefficient of BiFeO3 heterostructures as a function of heating current frequency at zero dc bias.« less
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