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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers & Short Notes >Charge Compensation Mechanism Decreases Dielectric Loss in Manganese-Doped Pb(Fe_(1/2)Nb_(1/2))O_3 Ceramics
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Charge Compensation Mechanism Decreases Dielectric Loss in Manganese-Doped Pb(Fe_(1/2)Nb_(1/2))O_3 Ceramics

机译：电荷补偿机制降低掺杂锰的Pb（Fe_（1/2）Nb_（1/2））O_3陶瓷的介电损耗

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Mn-doped Pb(Fe_(1/2)Nb_(1/2))O_3 (PFN) ceramics are synthesized by the conventional solid-state reaction method via a B-site oxide mixing route. The pure perovskite phase of Mn-doped PFN is obtained up to 0.75 mol% of manganese doping. Due to manganese doping, dielectric loss of the obtained ceramics decreases continuously up to 3 mol% of manganese, although pyrochlore phase appears. The decrease of dielectric loss can be explained by the charge compensation effect caused by the substitution of Mn~(4+) for Fe~(3+) in the octahedral cage of the perovskite structure, which is confirmed by X-ray photoelectron spectrometry (XPS). That is, due to the substitution of Mn~(4+) for Fe~(3+) ions, the relative content of iron in different valence states changes, i.e., the relative content of Fe~(2+) ions increases with the amount of doped manganese. Therefore, the hole-conduction mechanism caused by the partial reduction of Fe~(3+) to Fe~(2+) in the PFN system weakens, which leads to the decrease of dielectric loss. The effect of manganese doping on the depression of mechanical vibration loss also provides some contribution to the decrease of total dielectric loss through pinning down the rotation of spontaneous polarization induced by combining Mn~(2+) (reduced of doped Mn~(4+) ions during sintering) with the oxygen vacancy (produced by the compensation effect) and standing near the domain boundary. The relative dielectric constant of the Mn-doped PFN ceramics also decreases continuously with the increase of manganese content, which is believed to be related to the reduction of space-charge polarization.
机译：锰掺杂的Pb（Fe_（1/2）Nb_（1/2））O_3（PFN）陶瓷是通过传统的固态反应方法通过B位氧化物混合途径合成的。 Mn掺杂PFN的纯钙钛矿相的含量最高可达0.75 mol％。由于锰掺杂，尽管出现烧绿石相，但所获得的陶瓷的介电损耗连续降低，直至锰的3mol％。介电损耗的减少可以用钙钛矿结构的八面体笼中的Mn〜（4+）代替Fe〜（3+）引起的电荷补偿效应来解释，这可以通过X射线光电子能谱法得到证实（ XPS）。也就是说，由于用Mn〜（4+）代替Fe〜（3+）离子，不同价态的铁的相对含量发生变化，即Fe〜（2+）离子的相对含量随铁离子的增加而增加。一定数量的掺杂锰。因此，PFN系统中Fe〜（3+）部分还原为Fe〜（2+）引起的空穴传导机制减弱，导致介电损耗降低。锰掺杂对降低机械振动损耗的影响还通过抑制由Mn〜（2+）结合引起的自发极化的旋转（减少了Mn〜（4+）的掺杂）为降低总介电损耗做出了贡献。离子在烧结过程中）与氧空位（通过补偿效应产生）并位于畴边界附近。锰掺杂的PFN陶瓷的相对介电常数也随着锰含量的增加而连续降低，这被认为与空间电荷极化的降低有关。

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