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Neutron diffraction study of field-cooling effects on the relaxor ferroelectric Pb[(Zn$$_{1/3}$$Nb$$_{2/3}$$)$$_{0.92}$$Ti$$_{0.08}$$]O$$_3$$

中性子回折によるリラクサー強誘電体Pb[(Zn$$_{1/3}$$Nb$$_{2/3}$$)$$_{0.92}$$Ti$$_{0.08}$$]O$$_3$$の電場中冷却効果の研究

大和田 謙二; 廣田 和馬*; Rehrig, P. W.*; 藤井 保彦*; 白根 元*

Owada, Kenji; Hirota, Kazuma*; Rehrig, P. W.*; Fujii, Yasuhiko*; Shirane, Gen*

高電場-高温度のもと、中性子回折実験を注意深く行った結果、PZN-8%PTの分極回転の経路に関する詳細な温度電場相図を完成させた。これによりPZN-8%PTの温度-電場経歴依存性が明らかになった。さらにゼロ電場中冷却で今まで菱面体相と考えられてきた相が、実はもっと対称性の低い相であることがわかった。われわれはこの相をX相と名づけた。

High-temperature ($$T$$) and high-electric-field ($$E$$) effects on Pb[(Zn$$_{1/3}$$Nb$$_{2/3}$$)$$_{0.92}$$Ti$$_{0.08}$$]O$$_{3}$$ (PZN-8%PT) were studied comprehensively by neutron diffraction in the ranges $$300 le T le 550$$~K and $$0 le E le 15$$~kV/cm. We have focused on how phase transitions depend on preceding thermal and electrical sequences. In the field cooling process (FC, $$E parallel [001] ge 0.5$$~kV/cm), a successive cubic (C) $$rightarrow$$ tetragonal (T) $$rightarrow$$ monoclinic (M$$_{rm C}$$) transition was observed. In the zero field cooling process (ZFC), however, we have found that the system does ${em not}$ transform to the rhombohedral (R) phase as widely believed, but to a new, unidentified phase, which we call X. X gives a Bragg peak profile similar to that expected for R, but the $$c$$-axis is always slightly shorter than the $$a$$-axis. As for field effects on the X phase, it transforms into the M$$_{rm C}$$ phase via another monoclinic phase (M$$_{rm A}$$) as expected from a previous report [Noheda ${it et al.}$$ Phys. Rev. B {bf 65}$, 224101 (2002)].

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パーセンタイル:94.65

分野:Materials Science, Multidisciplinary

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