TY - GEN
T1 - Presence of the ferroelectric monoclinic state in the mixed ferroelectric system Ba(Ti 1-xZr x)O 3
AU - Tsukasaki, Hirofumi
AU - Koyama, Yasumasa
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - The mixed-oxide system Ba(Ti 1-xZr x)O 3 (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.
AB - The mixed-oxide system Ba(Ti 1-xZr x)O 3 (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.
KW - Ba(Ti Zr )O
KW - Dielectric response
KW - Ferroelectric domain structure
KW - Morphotropic phase boundary
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=84855251169&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84855251169&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.409.555
DO - 10.4028/www.scientific.net/AMR.409.555
M3 - Conference contribution
AN - SCOPUS:84855251169
SN - 9783037853047
T3 - Advanced Materials Research
SP - 555
EP - 560
BT - THERMEC 2011 Supplement
T2 - 7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
Y2 - 1 August 2011 through 5 August 2011
ER -