High temperature creep-mediated functionality in polycrystalline barium titanate

Ren, Pengrong and Hoefling, Marion and Koruza, Jurij and Lauterbach, Stefan and Jiang, Xijie and Froemling, Till and Khatua, Dipak Kumar and Dietz, Christian and Porz, Lukas and Ranjan, Rajeev and Kleebe, Hans-Joachim and Roedel, Juergen (2019) High temperature creep-mediated functionality in polycrystalline barium titanate. In: JOURNAL OF THE AMERICAN CERAMIC SOCIETY .

Preview	PDF jou_ame_che_soc_2019.pdf - Published Version Download (2MB) | Preview
	Microsoft Word jace16881-sup-0001-figs1.doc - Published Supplemental Material Download (460kB)

Abstract

Dislocations in oxides can be described as charged line defects and means for one-dimensional doping, which can tune electrical and thermal properties. Furthermore, theoretically it was shown that dislocations can pin ferroelectric domain walls. Broader application of this concept hinges on the development of a methodology to avail this approach to polycrystalline ceramics. To this end, we use different creep mechanisms as a method to introduce multidimensional defects and quantify structural changes. A deformation map for fine-grained barium titanate is provided and the influences of the defects and creep regimes are correlated in this first study to modifications of electrical conductivity, dielectric, ferroelectric, and piezoelectric properties. A plastic deformation of 1.29% resulted in an increase in the Curie temperature by 5 degrees C and a decrease in electromechanical strain by 30%, pointing toward electromechanical hardening by dislocations.

Item Type:	Journal Article
Publication:	JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Publisher:	WILEY
Additional Information:	Copyright of this article belongs to WILEY
Keywords:	barium titanate; creep; dislocations; ferroelectricity/ferroelectric materials; piezoelectric materials/properties
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	05 Feb 2020 11:05
Last Modified:	05 Feb 2020 11:05
URI:	http://eprints.iisc.ac.in/id/eprint/64203

Actions (login required)

View Item