Ferroelectric phase transitions in Pb0.96Ba0.04Sc0.5Nb0.5O3 and Pb0.94Ba0.06Sc0.5Nb0.5O3 solid-solution single crystals
Ferroelectric phase transitions in Pb0.96Ba0.04Sc0.5Nb0.5O3 and Pb0.94Ba0.06Sc0.5Nb0.5O3 solid-solution single crystals
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Pb0.96Ba0.04Sc0.5Nb0.5O3 和 Pb0.94Ba0.06Sc0.5Nb0.5O3 固溶体单晶中的铁电相变
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
V. Smotrakov
中科院分区：
文献类型：
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作者：
L. S. Kamzina;I. Raevskiĭ;V. V. Eremkin;V. Smotrakov
首次研究了Pb0.96Ba0.04Sc0.5Nb0.503(PBSN-4)和Pb0.94Ba0.06Sc0.5Nb0.503(PBSN-6)单晶固溶体的光学性质。结果表明，在不存在电场的情况下，PBSN-4中发生的自发相变伴随着光透过率的极小值，这表明了相变的渗流性质。在不加电场的情况下，PbSN-6单晶的光透过率与温度的关系没有明显的变化。然而，一个很弱的电场，∼0.4kV/cm，就足以在PbSn6单晶中诱导出铁电态。结果表明，感生铁电态的破坏是一级相变，它伴随着小角散射强度的反常窄峰(或光学传输的极小值)，并通过渗流机制发生。
The optical properties of Pb0.96Ba0.04Sc0.5Nb0.5O3 (PBSN-4) and Pb0.94Ba0.06Sc0.5Nb0.5O3 (PBSN-6) single-crystal solid solutions were studied for the first time. It was shown that the spontaneous phase transition occurring in PBSN-4 with no electric field present is accompanied by a sharp minimum in optical transmission, which indicates the percolation nature of the transition. No sharp changes were observed in the temperature dependence of optical transmission in PBSN-6 single crystals with no electric field applied. However, a very weak electric field, ∼0.4 kV/cm, is sufficient to induce the ferroelectric state in PBSN-6 single crystals. It was shown that the destruction of the induced ferroelectric state is a first-order phase transition which is accompanied by an anomalously narrow peak in the small-angle light scattering intensity (or by a minimum in optical transmission) and occurs through the percolation mechanism.