Presence of the Ferroelectric Monoclinic State in the Mixed Ferroelectric System Ba(Ti1-xZrx)O3

Hirofumi Tsukasaki; Yasumasa Koyama

doi:10.4028/www.scientific.net/AMR.409.555

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 409Presence of the Ferroelectric Monoclinic State in...

Presence of the Ferroelectric Monoclinic State in the Mixed Ferroelectric System Ba(Ti_1-xZr_x)O₃

Abstract:

The mixed-oxide system Ba (Ti_1-xZr_x)O₃ (BTZ) with the simple perovskite structure was reported to exhibit the remarkable dielectric response around x = 0.08. In order to understand the origin of the response, we have investigated the crystallographic features of ferroelectric states in BTZ with 0 ≤ x ≤ 0.15 mainly by transmission electron microscopy. According to the constructed phase diagram of BTZ, when the Zr content increases from x = 0 around 300 K, the ferroelectric tetragonal state in BaTiO₃ is changed into the ferroelectric orthorhombic state around x = 0.03, and then into the ferroelectric monoclinic state around x = 0.06. That is, the monoclinic state with a polarization vector in the {110}_PC planes is present in BTZ with 0.07 ≤ x ≤ 0.15, where the subscript PC denotes the paraelectric cubic state. The notable feature of the monoclinic state is that it exhibits the herringbone-type domain structure consisting of nanometer-sized ferroelectric domains. It is thus understood that the remarkable dielectric response in BTZ should be associated with the presence of nanometer-sized domains with the monoclinic symmetry.

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Periodical:

Advanced Materials Research (Volume 409)

Pages:

555-560

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.409.555

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Online since:

November 2011

Authors:

Hirofumi Tsukasaki, Yasumasa Koyama

Keywords:

Ba(Ti_1-xZr_x)O₃, Dielectric Response, Ferroelectric Domain Structure, Morphotropic Phase Boundary, Transmission Electron Microscopy (TEM)

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