Domain size effects in a uniaxial ferroelectric relaxor system: The case of SrxBa1−xNb2O6
Domain size effects in a uniaxial ferroelectric relaxor system: The case of SrxBa1−xNb2O6
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单轴铁电弛豫系统中的磁畴尺寸效应：SrxBa1−xNb2O6 的情况
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
K. Betzler
中科院分区：
文献类型：
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作者：
U. Voelker;Urs Heine;Christoph Gödecker;K. Betzler
We present investigations of the domain dynamics and of the evolution of the critical exponent β in a ferroelectric relaxor system, exemplarily in the up-to-date controversial strontium barium niobate (SBN). k-space spectroscopy at the phase-transition and when applying an electric field reveals a size-dependent response of the domains. This is supported by pyroelectric measurements that show, by analysis in terms of criticality, the critical exponent β is not only dependent on the level of poling but also on the manner in which the poling was achieved. It must be concluded that the crystals undergo a phase transition not—as commonly assumed—in a uniform way with homogeneous polarization throughout the crystal. Instead they behave as a set of more or less independent domains with size-dependent stability. Therefore, one should be very careful with critical exponents—especially those derived from experiments that explicitly or implicitly—assume a uniform polarization behavior.
