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Local structure analysis of PbTiO$$_3$$ in high-temperature cubic phase

Yoneda, Yasuhiro; Taniguchi, Hiroki*; Kitanaka, Yuki*; Noguchi, Yuji*

Lead titanate, PbTiO$$_3$$, has a tetragonal structure having a large c/a ratio at room temperature. A phase transition to the paraelectric phase at 490$$^{circ}$$C, structural changes to cubic. However, just above the transition point to the paraelectric phase, the phonon modes of the still ferroelectric is observed. Therefore, spontaneous polarization using a sample of reversible high quality, perform high-energy X-ray diffraction experiments were subjected to structural analysis in a wide temperature range from room temperature to 800$$^{circ}$$C. Short range order structure analysis and atomic two pairs distribution function (atomic pair-distribution function, PDF) was performed using. A comparison local structures at room temperature of the observed local structure and relaxor Pb (Mg$$_{1/3}$$Nb$$_{2/3}$$)O$$_3$$ (PMN) with 800$$^{circ}$$C of PbTiO$$_3$$, network structure similar to the relaxor PMN is present in the high temperature phase of PbTiO$$_3$$ It is considered to have.

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