On the Possible Curie Temperature and Ferroelectricity for SrTiO3 and KTaO3

Zhang, L.; Zhong, W. L.; Wang, Y. G.; Wang, C. L.

doi:10.1002/(sici)1521-396x(199807)168:1<325::aid-pssa325>3.0.co;2-t

Cited by 8 publications

(2 citation statements)

References 32 publications

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“…SrTiO 3 is an incipient ferroelectric. Our previous work showed that its possible single-crystal Curie temperature is 3.0 K [41]. Thus its ferroelectric critical size tends to be infinite.…”

Section: Ferroelectric Critical Sizementioning

confidence: 99%

Finite-size effects in ferroelectric solid solution

Zhang

Zhong

Wang

et al. 1999

J. Phys. D: Appl. Phys.

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We studied the effect of grain size on the ferroelectric phase transitions in ceramics (x = 0.3, 0.5 and 0.7) prepared by a sol-gel method. The samples were observed and analysed by SEM, TEM and x-ray diffraction. The phase transitions were investigated by means of dielectric measurements. With the decrease of grain size, the Curie temperature decreases and the Curie peak becomes lower and broader and eventually disappears. The diffuseness of the dielectric response is understood on the basis of a diffuse phase transition model. The size dependence of can be described by , where is the for bulk , D is the grain size, and C and are two constants. This equation gives three ferroelectric critical sizes of 317 nm, 246 nm and 176 nm for x = 0.3, 0.5 and 0.7 respectively.

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Section: Ferroelectric Critical Sizementioning

confidence: 99%

Finite-size effects in ferroelectric solid solution

Zhang

Zhong

Wang

et al. 1999

J. Phys. D: Appl. Phys.

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show abstract

“…Below its melting point, KTaO 3 is a cubic perovskite, which consists of TaO 6 corner-sharing octahedra and K occupying the large dodecahedral sites. 23 The formal charges for K, Ta, and O are +1, +5, and −2, respectively, and thus along the (001) direction there are alternating charged planes of KO − and TaO 2 + ( Figure 1 ), yielding stoichiometric slabs with “Tasker type 3” polar surfaces, which are unstable and must undergo reconstruction. 24 …”

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confidence: 99%