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approvedosi11_summary_poster.pdf2015-06-05 13:34:07Yujin Cho

Abstracts

Author: Yujin Cho
Requested Type: Poster
Submitted: 2015-05-29 12:51:15

Co-authors: F. Shafiei, Z. Li, J. Zhou, M. C. Downer

Contact Info:
The University of Texas at Austin
2511 Speedway
Austin, Texas   78712
United States

Abstract Text:
Perovskite-type ferroelectric oxides such as BaTiO3 are used widely as actuators, sensors and memory storage devices. Recently, ferroelectricity was demonstrated in a double perovskite structure, CaMnTi_2O_6, in which Mn atom at the A site ordering and second-order Jahn Teller (SOJT) effect are coupled ferroelectrically [1]. In this work, we successfully synthesized double perovskite ferroelectrics, CaMnTi_2O_6, at relatively low pressure, 0.05GPa, using Spark Plasma Sintering (SPS) method. However, the structural distortion is so small that it’s hard to study its properties using X-ray diffraction which has been commonly used to see ferroelectricity. Using optical second-harmonic microscopy, which is sensitive to the non-symmetric structure, we estimated Curie temperature, and measured its micron-scale spatial variations including the behavior of the domain walls.

[1] A. Aimi et al., Chem. Mater. 26, 2601-2608 (2014)

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