TY - JOUR
T1 - Enhanced pyroelectric properties of Bi1-xLaxFeO3 thin films
AU - Zhang, Lei
AU - Huang, Yen-Lin
AU - Velarde, Gabriel
AU - Ghosh, Anirban
AU - Pandya, Shishir
AU - Garcia, David
AU - Ramesh, Ramamoorthy
AU - Martin, Lane W.
N1 - Publisher Copyright:
© 2019 Author(s).
PY - 2019/11/1
Y1 - 2019/11/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85075637919&partnerID=8YFLogxK
U2 - 10.1063/1.5128413
DO - 10.1063/1.5128413
M3 - Article
AN - SCOPUS:85075637919
SN - 2166-532X
VL - 7
SP - 1
EP - 7
JO - APL Materials
JF - APL Materials
IS - 11
M1 - 111111
ER -