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Phase transitions of (1−x) PbZrO3 + x (Na1/2Bi1/2)TiO3 (0.01 ≤ x ≤ 0.15) solid solutions

Published online by Cambridge University Press:  26 July 2012

Jung-Kun Lee ,
Hyuk-Joon Youn  and
Kug Sun Hong
Jung-Kun Lee
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
Hyuk-Joon Youn
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
Kug Sun Hong
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
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Morphotropic phase boundaries and temperature dependent phase transitions of (1 – x) PbZrO3 + x (Na1/2Bi1/2)TiO3 (0.01 ≤ x ≤ 0.15) solid solutions were investigated by x-ray diffraction, differential scanning calorimetry (DSC), and dielectric property analysis. Two morphotropic phase transitions at room temperature were found at x = 0.1 and 0.13, which were from antiferroelectric orthorhombic (with 4 × 4 × 2 superlattice [orthorhombic (I)]) to antiferroelectric orthorhombic (with 2 × 2 × 2 superlattice [orthorhombic (II)]) and from orthorhombic (II) to ferroelectric rhombohedral, respectively. With increasing temperature, the samples with 0.01 ≤ x < 0.1 showed two phase transitions, i.e., from orthorhombic (I) to orthorhombic (II) and from orthorhombic (II) to cubic. The other samples had only one phase transition with increasing temperature. Phase transition temperatures of all the samples were measured using DSC, and a phase diagram for the solid solutions was constructed. A model illustrating the antiparallel shift of Pb ions in the orthorhombic (II) phase was also proposed.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 1 , January 1999 , pp. 83 - 89
Copyright
Copyright © Materials Research Society 1999

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