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7 Nov 2011

Volume 99, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 99, 193101 (2011); http://dx.doi.org/10.1063/1.3657777 (3 pages)

Sungwook Chung, Jonathan R. Felts, Debin Wang, William P. King, and James J. De Yoreo
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Weak-relaxor behaviour in Bi/Yb-doped KNbO3 ceramics

Luke Luisman, Antonio Feteira, and Klaus Reichmann

Appl. Phys. Lett. 99, 192901 (2011); http://dx.doi.org/10.1063/1.3660255 (3 pages) | Cited 2 times

Online Publication Date: 9 November 2011

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Weak-relaxor behaviour was observed in K1−xBixNb1−xYbxO3 ceramics with x = 0.20 and x = 0.30. According to x-ray diffraction analysis, the crystal structure of these ceramics can be described by the cubic centrosymmetric Pmmathm space group; however Raman spectroscopy reveals both the occurrence of local lattice distortions and the disruption of the long-range ferroelectric order. The local lattice strain caused by the larger Yb3+ combined with the presence of Bi3+, which lone-pair of electrons induces further local distortions, gives rise to polar nanoregions (PNRs). Nevertheless, the interaction between the PNRs appears weak and proper relaxor behaviour does not develop.
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77.80.Jk Relaxor ferroelectrics
77.80.Dj Domain structure; hysteresis
77.84.Ek Niobates and tantalates
78.30.Hv Other nonmetallic inorganics
77.22.Ch Permittivity (dielectric function)
77.22.Gm Dielectric loss and relaxation
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