Ternary Skutterudites: Anion Ordering and Thermoelectric Properties

2007 ◽  
Vol 1044 ◽  
Author(s):  
Paz Vaqueiro ◽  
Gerard G. Sobany
Keyword(s):  
Seebeck Coefficient ◽  
Transport Properties ◽  
Thermoelectric Properties ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Electrical Transport ◽  
Powder Diffraction Data ◽  
Electrical Transport Properties ◽  
Electrical Resistivities ◽  
Thermal Conductivities

AbstractThe ternary skutterudites AB1.5Q1.5 (A = Co, Rh, Ir, B =Ge, Sn and Q = S, Te) have been synthesized and structurally characterised. Powder diffraction data are consistent with the presence of anion ordering, which results in a lowering of the symmetry from cubic to rhombohedral. The ordered skutterudite structure contains rhomboidal four-membered B2Q2 rings, instead of the homonuclear rectangular rings found in binary skutterudites. The electrical transport properties of the AB1.5Q1.5 phases are consistent with semiconducting behaviour, and large values of the Seebeck coefficient have been observed for several of these materials. While their large electrical resistivities might make these materials unsuitable for thermoelectric applications unless significant improvements can be achieved by doping, these materials also exhibit significantly lower thermal conductivities than their binary counterparts.

scholarly journals Outstanding thermoelectric properties of solvothermal-synthesized Sn1−3xInxAg2xTe micro-crystals through defect engineering and band tuning

2020 ◽  
Vol 8 (7) ◽  
pp. 3978-3987 ◽  
Author(s):  
Raza Moshwan ◽  
Wei-Di Liu ◽  
Xiao-Lei Shi ◽  
Qiang Sun ◽  
Han Gao ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Transport Properties ◽  
Valence Band ◽  
Thermoelectric Properties ◽  
Electrical Transport ◽  
Energy Levels ◽  
Resonance Energy ◽  
Defect Engineering ◽  
Electrical Transport Properties ◽  
Co Doping

In eco-friendly SnTe thermoelectrics, In and Ag co-doping induces the synergistic effect of resonance energy levels and valence band convergence to enhance its electrical transport properties, while defects ameliorates its thermal transport.

Thermoelectric properties of polycrystalline Bi2Se3−x by powder compaction sintering

2020 ◽  
Vol 34 (18) ◽  
pp. 2050206
Author(s):  
Ying Zhou ◽  
Zhenhua Ge ◽  
Jun Guo ◽  
Jing Feng
Keyword(s):  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Carrier Concentration ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
Electrical Transport ◽  
Bulk Material ◽  
Powder Compaction ◽  
Electrical Transport Properties ◽  
X Ray

[Formula: see text] is a [Formula: see text] compound (where Pn = Bi and Sb, Ch = Te, Se, and S), which has attracted increasing attention as a candidate for use in thermoelectric applications. Previous studies demonstrated the advantage of [Formula: see text] thermoelectric materials, despite an inferior thermoelectric performance. Herein, a series of [Formula: see text] ([Formula: see text], 0.10, 0.15, 0.20, and 0.25) thermoelectric materials were prepared by powder compaction sintering. The effects of phase structures and microstructure of the [Formula: see text] bulk material were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The thermoelectric properties, including Seebeck coefficient, electrical conductivity, and thermal conductivity, were measured systematically. The results show that carrier concentration increased with decreasing Se content, which in turn affected the electrical transport properties. Low Se contents gave larger power factor (PF) values than the pristine [Formula: see text] sample, the maximum PF value being [Formula: see text] at 320 K for [Formula: see text]. The variation in PF was attributed to the variations in electrical conductivity [Formula: see text] and Seebeck coefficient [Formula: see text] upon optimizing Se content. The [Formula: see text] samples showed an enhanced thermoelectric figure of merit (ZT) with increasing measurement temperature, due to the increased [Formula: see text] value, [Formula: see text], and decreased [Formula: see text]. The [Formula: see text] sample exhibited the highest ZT (0.28) at 575 K, while [Formula: see text] exhibited the lowest ZT (0.14) at 325 K. This indicated that tuning Se content was an effective way to enhance carrier concentration.

Enhanced thermoelectric properties of polycrystalline BiCuSeO via dual-doping in Bi sites

2019 ◽  
Vol 6 (3) ◽  
pp. 799-807 ◽  
Author(s):  
Fu Li ◽  
Min Ruan ◽  
Yuexing Chen ◽  
Wenting Wang ◽  
Jingting Luo ◽  
...  
Keyword(s):  
Transport Properties ◽  
Thermoelectric Properties ◽  
Electrical Transport ◽  
Electrical Transport Properties ◽  
Co Doped

Enhanced electrical transport properties are achieved for La, Pb co-doped BiCuSeO, resulting in optimized thermoelectric properties.

scholarly journals Tailoring the structure and thermoelectric properties of BaTiO3via Eu2+ substitution

2017 ◽  
Vol 19 (21) ◽  
pp. 13469-13480 ◽  
Author(s):  
Xingxing Xiao ◽  
Marc Widenmeyer ◽  
Wenjie Xie ◽  
Tianhua Zou ◽  
Songhak Yoon ◽  
...  
Keyword(s):  
Transport Properties ◽  
Valence Band ◽  
Thermoelectric Properties ◽  
Electrical Transport ◽  
Electrical Transport Properties

The presence of filled Eu2+ 4f states at the top of the valence band significantly affect the electrical transport properties of Ba1−xEuxTiO3−δ compounds.

Investigation of electrical transport properties of Bi0.5Sb1.5Te2.7Se0.3 alloys prepared by high-pressure method

2015 ◽  
Vol 08 (05) ◽  
pp. 1550055 ◽  
Author(s):  
Xin Guo ◽  
Xiaopeng Jia ◽  
Yuewen Zhang ◽  
Hairui Sun ◽  
Bing Sun ◽  
...  
Keyword(s):  
High Pressure ◽  
Electrical Resistivity ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Electrical Transport ◽  
Room Temperature ◽  
Synthesis Process ◽  
Electrical Transport Properties ◽  
Pressure Method ◽  
Measurement Results

The quaternary Bi 0.5 Sb 1.5 Te 2.7 Se 0.3 alloys have been successfully synthesized within 25 min by high-pressure method. The pressure-dependent electrical transport properties of the as-prepared Bi 0.5 Sb 1.5 Te 2.7 Se 0.3 alloys are carefully investigated at room temperature. The measurement results indicate that the electrical resistivity and the Seebeck coefficient reveal a strong correlation with the increase of synthesis pressure. The carrier concentration and mobility are modulated effectively due to the effects of synthesis pressure and composition, leading to an improvement in the power factor of Bi 0.5 Sb 1.5 Te 2.7 Se 0.3. These results suggest that the utilization of pressure during the synthesis process provides an effective and controllable strategy to optimize the electrical transport properties of the ( Bi , Sb )2( Te , Se )3 alloys.

FIDDLE. Simultaneous Indexing and Structure Solution from Powder Diffraction Data using a Genetic Algorithm and Correlation Functions

2019 ◽  
Author(s):  
Carmen Guguta ◽  
Jan M.M. Smits ◽  
Rene de Gelder
Keyword(s):  
Genetic Algorithm ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Correlation Functions ◽  
Cross Correlation ◽  
Simultaneous Optimization ◽  
Powder Diffraction Data ◽  
Structure Solution ◽  
Matching Technique

A method for the determination of crystal structures from powder diffraction data is presented that circumvents the difficulties associated with separate indexing. For the simultaneous optimization of the parameters that describe a crystal structure a genetic algorithm is used together with a pattern matching technique based on auto and cross correlation functions.<br>

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