Composition-Related Dielectric, Ferroelectric and Electrocaloric Properties of Pb5Ge3O11 Single Crystals Modified by Ba Ions

Magdalena Krupska-Klimczak; Irena Jankowska-Sumara; Przemysław Gwizd; Marceli Koralewski; Andrzej Soszyński

doi:10.3390/ma16010413

Composition-Related Dielectric, Ferroelectric and Electrocaloric Properties of Pb₅Ge₃O₁₁ Single Crystals Modified by Ba Ions

Materials (Basel). 2023 Jan 1;16(1):413. doi: 10.3390/ma16010413.

Authors

Magdalena Krupska-Klimczak^{1

2}, Irena Jankowska-Sumara¹, Przemysław Gwizd¹, Marceli Koralewski³, Andrzej Soszyński⁴

Affiliations

¹ Department of Exact and Natural Sciences, Pedagogical University of Krakow, Podchorążych 2, 30-084 Kraków, Poland.
² Institute of Security Studies and Computer Science, Pedagogical University of Krakow, Podchorążych 2, 30-084 Kraków, Poland.
³ Faculty of Physics, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland.
⁴ Institute of Physics, University of Silesia, 75 Pułku Piechoty, 41-500 Chorzow, Poland.

Abstract

In this paper, we studied some ferroelectric properties of archetypal oxide uniaxial ferroelectric single crystals of Pb₅Ge₃O₁₁ modified by Ba ions. They include dielectric, DSC, ferroelectric polarization, and electrocaloric effect (ECE) measurements. The measurements show that increasing Ba doping considerably influences all the measured parameters, mainly by lowering the Curie temperature, gradually diffusing the phase transition, and decreasing values of polarization as well as the coercive field. The decrease in overall ECE is influenced by decreasing polarization. Compared with the pure PGO single crystals, this decrease is from 1.2 K to 0.2 K. However, the effect of diffusing the phase transition increases the range of its occurrence (up to 30 K), which might be beneficial in applications.

Keywords: electrocaloric effect; ferroelectrics; phase transition.

Grants and funding

This research received no external funding.