Thermoelectric properties of Li-doped Sr0.7Ba0.3Nb2O6-δ ceramics

• 来源期刊: 中国物理B（英文版）
• 关键词: Sr0.7Ba0.3Nb2O6-δ interstitial doping thermoelectric properties
• 年，卷（期）: 2017,（10）
• 页码范围: 423-427
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/26/10/107201

摘要

Thermoelectric properties of Li-doped Sr0.70Ba0.30Nb2O6-δ ceramics were investigated in the temperature range from 323 K to 1073 K.The electrical conductivity increases significantly after lithium interstitial doping.However,both of the magnitudes of Seebeck coefficient and electrical conductivity vary non-monotonically but synchronously with the doping contents,indicating that doped lithium ions may not be fully ionized and oxygen vacancy may also contribute to carriers.The lattice thermal conductivity increases firstly and then decreases as the doping content increases,which is affected by competing factors.Thermoelectric performance is enhanced by lithium interstitial doping due to the increase of the power factor and the thermoelectric figure of merit reaches maximum value (0.21 at 1073 K) in the sample Sr0.70Ba0.30Li0.10Nb2O6.