反铁电性
铁电性
凝聚态物理
相变
极化(电化学)
电介质
材料科学
微晶
介电常数
相(物质)
透射电子显微镜
结晶学
化学
物理
纳米技术
光电子学
有机化学
物理化学
作者
Hanzheng Guo,Hiroyuki Shimizu,Clive A. Randall
摘要
Hot-stage in situ transmission electron microscopy was employed to investigate the temperature-induced complex sequence of phase transitions in NaNbO3 polycrystalline. In addition to the commonly recognized P (Pbma) → R (Pmnm) → S (Pnmm) phase transitions, incommensurate phases were observed to exist in P and R phase regions. The former (in the P → R transition region) is coincident with a diffused dielectric peak appearing at ∼170 °C, and the latter (in the R → S transition region) serves as an intermediate structure to bridge the two sub-phases in the R phase region. The incommensurate phase in the P phase region can be inferred from the polarization current density and differential dielectric permittivity anomalies, and it provides the bridge structure during the electric field-induced polarization reversal and antiferroelectric-to-ferroelectric transition in NaNbO3 solid solutions.
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