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/(SiC)y复合热电材料的电输运特性为n型传导,电阻率和Seebeck系数均随SiC含量的增多而增大,在室温附近仍保持有良好的电输运特性.纳米SiC颗粒弥散分布在晶界位置,可以增加声子散射,显著降低热导率,使得复合有SiC的样品的ZT值相较未掺杂的样品有所提高,在SiC复合量摩尔比y=0.01,T=323K时,Bi2(Te0.9Se0.1)3/(SiC)0.01成分样品具有最大ZT值,达到......
子态密度及分布计算结果表明,体系晶格振动频率主要集中在3~10THz和10~12THz范围之内,其中振动频率约为11THz的振动模式在体系中数量较多,主要为光学波声子.热电性能理论分析结果表明,ZnO基热电氧化物应该具有较高的Seebeck系数和热电性能.关键词:ZnO热电氧化物;电子结构;热学性能;......
rule. The carrier concentration dependences of mobility and Seebeck coefficient represent two band contribution in the valence band, and the optimized carrier concentration for thermoelectric......
texture. The electrical resistivity was modulated as a result of carrier concentration modification, however the carrier transport process was not influenced; the Seebeck coefficient was deteriorated......
parallel toward the pressure direction in the densification process,(2) increase considerably the effective mass and thus the Seebeck coefficient,and(3) yield point defects and Cu-Se secondary phases......
体在平行烧结压力方向的ZT略优.最优组分Nb0.03Mo0.485W0.485SeTe在垂直于烧结压力和平行于烧结压力方向获得了最高ZT,分别达到0.31和0.36(@823 K),是目前MoSe2基热电材料获得的最好结果之一.后续通过优化掺杂元素来改善Seebeck系数和功率因子,将有望进一步提升MoSe2基化合物的ZT.关键词:Mo1–xWxSeTe固溶体;Nb掺杂;晶格热导率......
conductivity, and little change in Seebeck coefficients. It is encouraging that the reduction of thermal conductivity can compensate for the deterioration of electrical performance, leading......
of merit (Z), Z=α2/(ρλ), where α is the Seebeck coefficient, ρ is the electrical resistivity, λ is the thermal conductivity. High ZT leads to high efficiency. In order to improve the electrical... in Ar atmosphere. The phase formation of the samples was characterized by X-ray diffraction (XRD) in a BRUKER D8-ADVANCE diffractometer using Cu Kα radiation. The Seebeck coefficient and the electrical......
quenching; thermoelectric properties; thermoelectric materials 当今世界能源日益短缺,人类的生产与生活中产生的废热如果能利用热电发电装置转换为电能,将大大提高能源利用效率[1].热电器件由于质量轻,尺寸小,无噪声,无污染而受到越来越多的关注[2].表征热电材料的性能指数为无量纲优值,其中,,,T分别为Seebeck系数,电导率,热导率和绝对温...)可以看出,3个样品都具有负的Seebeck系数,表明它们具有N型导电特性；Seebeck系数的绝对值随温度的变化关系为先增加后减小；试样BTS-HP,BTS-OM-HP和BTSRS-OM-HP的Seebeck系数依次变大,因为微观结构对载流子的散射作用依次增强使3个试样的载流子浓度依次减小,散射因子γ依次增大[15].表征热电材料的电学性能的参数为功率因子.从图3(c)可以看出,试样 BTS-HP......
the temperature range of operation [12]. Typical values of elemental semiconductors for the Seebeck coefficient (S), electrical conductivity (σ), thermal conductivity (λ) and figure of merit (ZT) at room... semiconductors offer the right combination of high Seebeck coefficient, high electrical conductivity and low thermal conductivity. The change in ZT with temperature for most of the known thermoelectric n-type......
