Burns temperature

The Burns temperature, T_d, is the temperature where a ferroelectric material, previously in paraelectric state, starts to present randomly polarized nanoregions, that are polar precursor cluster. This behaviour is typical of several ferroelectric materials, but not of all, and was observed in lead titanate (PbTiO₃), potassium niobate (KNbO₃), lead lanthanum zirconate titanate (PLZT), lead magnesium niobate (PMN), lead zinc niobate (PZN), K₂Sr₄(NbO₃)₁₀, and strontium barium niobate (SBN).

The Burns temperature, named from Gerald Burns, who studied this phenomenon with collaboration of Frank H. Dacol, has not been well understood yet.

References

* [http://prola.aps.org/abstract/PRB/v28/i5/p2527_1 Gerald Burns and Frank H. Dacol, "Crystalline ferroelectrics with glassy polarization behavior", Phys. Rev. B 28, p.2527 - 2530 (1983)]
* [http://arxiv.org/pdf/cond-mat/0506132 S.A. Prosandeev et.al. "The significance of the Burns temperature in relaxor PMN"]
* [http://prola.aps.org/abstract/PRB/v34/i11/p7873_1 W. Kleemann and F. J. Schäfer, "Crystal optical studies of precursor and spontaneous polarization in PbTiO3", Phys. Rev. B 34, p.7873 - 7879 (1986)]

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