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Invar effect in PbFe _(1/2)Nb _(1/2)O _3 ceramics

机译:PbFe _(1/2)Nb _(1/2)O _3陶瓷中的殷钢效应

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High-density lead ferroniobate PbFe _(1/2)Nb _(1/2)O _3 (PFN) is prepared by conventional ceramic technology. Its structural properties are studied in a wide temperature range (293 ≤ T ≤ 973 K). The following chain of phase transitions is established in the vicinity of the transition to the polar phase: Rh (rhombohedral phase) (T < 363 K) → Psc (pseudo-cubic phase) (363 < T < 387 K) → C (cubic phase) (T > 387 K). The paraelectric range contains five ranges of constant unit-cell volume (invar effect): I (387 ≤ T ≤ 413 K), II (433 ≤ T ≤ 463 K), III (553 ≤ T ≤ 613 K), IV (743 ≤ T ≤ 773 K), and V (798 ≤ T ≤ 823 K). It is shown that the anomalous behavior of the PFN dielectric characteristics above the Curie temperature, which was revealed previously, is associated with the specific features of its real (defect) structure, which is caused by the crystal-chemical specificity of the main structure-forming agents: α-Fe _2O _3 and α _(ht)-Nb _2O _5.
机译:高密度铌铁酸铅PbFe _(1/2)Nb _(1/2)O _3(PFN)是通过常规陶瓷技术制备的。在较宽的温度范围(293≤T≤973 K)下研究了其结构性能。在向极性相的过渡附近建立了以下相变链:Rh(菱面体相)(T <363 K)→Psc(伪立方相)(363 387 K)。顺电范围包含5个单位电池体积恒定范围(因瓦效应):I(387≤T≤413 K),II(433≤T≤463 K),III(553≤T≤613 K),IV(743 ≤T≤773 K)和V(798≤T≤823 K)。结果表明,先前揭示的居里温度以上的PFN介电特性的异常行为与其真实(缺陷)结构的特定特征有关,这是由主要结构的晶体化学特异性引起的。形成剂:α-Fe_2O _3和α_(ht)-Nb _2O _5。

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