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Sr_xBa_(1_x)Nb_2O_(6-δ) Ferroelectric-thermoelectrics: Crystal anisotropy, conduction mechanism, and power factor

机译:Sr_xBa_(1_x)Nb_2O_(6-δ)铁电热电学:晶体各向异性,导电机理和功率因数

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摘要

Nonstoichiometric tungsten bronze-structured ferroelectric Sr_xBa_(1_x)Nb_2O_(6-δ) (SBN) single crystals were found to be a promising n-type thermoelectric oxide. Thermopower anomalies were observed at the phase transition temperatures, depending on the degree of reduction as well as crystal anisotropy. Above 500 K, heavily reduced SBN crystals show high thermoelectric power factors (~20 μW/cm K~2 at 516 K) with both thermopower and electrical conductivity higher parallel to the c-axis. It is noted that the power factor increases with temperature due to the semiconducting behavior with high carrier concentration. The carrier transport mechanism also varies with the degree of reduction and temperature.
机译:发现非化学计量钨青铜结构铁电体Sr_xBa_(1_x)Nb_2O_(6-δ)(SBN)单晶是一种很有前途的n型热电氧化物。在相变温度下观察到热电异常,这取决于还原程度以及晶体各向异性。在500 K以上,大量还原的SBN晶体显示出较高的热电功率因数(在516 K时约为20μW/ cm K〜2),并且热功率和电导率均平行于c轴。注意,由于载流子浓度高的半导体特性,功率因数随温度而增加。载流子传输机制也随着还原程度和温度的变化而变化。

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  • 来源
    《Applied Physicsletters》 |2010年第3期|031910.1-031910.3|共3页
  • 作者单位

    Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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