采用氧化物一次合成法制得了纯钙钛矿相的Pb(Fe_(1/2)Nb_(1/2))O_3陶瓷。经介电和热激发电流的测量,发现热激发电流峰温度和介电峰温度不一致。用过渡相区模型作了较好的解释。认为它仍为典型的弛豫型铁电体。本文对其介电弛豫不明显,即△T(0.1—100kHz)=0℃的原因以及Nb~(5+),Fe~(3+)离子在氧八面体中所处的状态作了讨论。
A Pb(Fe_(1/2)Nb_(1/2))O_3 ferroelectric ceramic with single perovskite phase was pre-pared using mixing and calcining the constituent oxides.The temperature dependences ofdielectric constant and thermally stimulated current were measured.The results indic
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