Enhanced pyroelectric properties of Bi1-xLaxFeO3 thin films

Lei Zhang, Yen-Lin Huang, Gabriel Velarde, Anirban Ghosh, Shishir Pandya, David Garcia, Ramamoorthy Ramesh, Lane W. Martin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

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.

Original languageEnglish
Article number111111
Pages (from-to)1-7
Number of pages7
JournalAPL Materials
Volume7
Issue number11
DOIs
StatePublished - 1 Nov 2019

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