High Performance Mg2(Si,Sn) Solid Solutions: a Point Defect Chemistry Approach to Enhancing Thermoelectric Properties

2014 ◽  
Vol 24 (24) ◽  
pp. 3776-3781 ◽  
Author(s):  
Guangyu Jiang ◽  
Jian He ◽  
Tiejun Zhu ◽  
Chenguang Fu ◽  
Xiaohua Liu ◽  
...  
Keyword(s):  
Point Defect ◽  
Thermoelectric Properties ◽  
Solid Solutions ◽  
High Performance ◽  
Defect Chemistry

scholarly journals Is Reduced Strontium Titanate a Semiconductor or a Metal?

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 744
Author(s):  
Christian Rodenbücher ◽  
Christo Guguschev ◽  
Carsten Korte ◽  
Sebastian Bette ◽  
Kristof Szot
Keyword(s):  
Point Defect ◽  
Decisive Role ◽  
Thermal Reduction ◽  
Defect Chemistry ◽  
Oxygen Activity ◽  
Metallic State ◽  
Metallic Behavior ◽  
Reducing Conditions ◽  
History Play ◽  
Semiconducting Behavior

In recent decades, the behavior of SrTiO3 upon annealing in reducing conditions has been under intense academic scrutiny. Classically, its conductivity can be described using point defect chemistry and predicting n-type or p-type semiconducting behavior depending on oxygen activity. In contrast, many examples of metallic behavior induced by thermal reduction have recently appeared in the literature, challenging this established understanding. In this study, we aim to resolve this contradiction by demonstrating that an initially insulating, as-received SrTiO3 single crystal can indeed be reduced to a metallic state, and is even stable against room temperature reoxidation. However, once the sample has been oxidized at a high temperature, subsequent reduction can no longer be used to induce metallic behavior, but semiconducting behavior in agreement with the predictions of point defect chemistry is observed. Our results indicate that the dislocation-rich surface layer plays a decisive role and that its local chemical composition can be changed depending on annealing conditions. This reveals that the prediction of the macroscopic electronic properties of SrTiO3 is a highly complex task, and not only the current temperature and oxygen activity but also the redox history play an important role.

Thermoelectric Properties of Bi2 –xLuxTe2.7Se0.3 Solid Solutions

2019 ◽  
Vol 53 (5) ◽  
pp. 673-677
Author(s):  
A. E. Vasil’ev ◽  
M. N. Yapryntsev ◽  
O. N. Ivanov ◽  
M. V. Zhezhu
Keyword(s):  
Thermoelectric Properties ◽  
Solid Solutions

Thermoelectric properties of I-doped Bi2Te2.85Se0.15 solid solutions

2014 ◽  
Vol 64 (11) ◽  
pp. 1692-1696 ◽  
Author(s):  
Go-Eun Lee ◽  
Il-Ho Kim ◽  
Young Soo Lim ◽  
Won-Seon Seo ◽  
Byeong-Jun Choi ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Solid Solutions

Thermoelectric Properties of K2Bi8−xSbxSe13Solid Solutions and Se Doping

2001 ◽  
Vol 691 ◽  
Author(s):  
Theodora Kyratsi ◽  
Jeffrey S. Dyck ◽  
Wei Chen ◽  
Duck-Young Chung ◽  
Ctirad Uher ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Charge Transport ◽  
Transport Properties ◽  
Thermoelectric Properties ◽  
Solid Solutions ◽  
Figure Of Merit ◽  
Lattice Thermal Conductivity ◽  
Se Doping ◽  
Mass Fluctuation ◽  
Thermal Conductivities

ABSTRACTOur efforts to improve the thermoelectric properties of β-K2Bi8Se13, led to systematic studies of solid solutions of the type β-K2Bi8−xSbxSe13. The charge transport properties and thermal conductivities were studied for selected members of the series. Lattice thermal conductivity decreases due to the mass fluctuation generated in the lattice by the mixed occupation of Sb and Bi atoms. Se excess as a dopant was found to increase the figure-of merit of the solid solutions.

Direct evaluation of hole effective mass of SnS–SnSe solid solutions with ARPES measurement

2021 ◽  
Author(s):  
Issei Suzuki ◽  
Zexin Lin ◽  
Sakiko Kawanishi ◽  
Kiyohisa Tanaka ◽  
Yoshitaro Nose ◽  
...  
Keyword(s):  
Effective Mass ◽  
Valence Band ◽  
Thermoelectric Properties ◽  
Solid Solutions ◽  
Photoemission Spectroscopy ◽  
Direct Evaluation ◽  
Hole Effective Mass ◽  
Single Crystalline ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Effective Masses

Valence band dispersions of single-crystalline SnS1-xSex solid solutions were observed by angle-resolved photoemission spectroscopy (ARPES). The hole effective masses, crucial factors in determining thermoelectric properties, were directly evaluated. They decrease...

scholarly journals Influence of Ir substitution on the thermoelectric properties of Ba0.3(IrxCo1-x)4Sb12 solid solutions

2007 ◽  
Vol 86 (4) ◽  
pp. 545-545 ◽  
Author(s):  
Y.Z. Pei ◽  
L.D. Chen ◽  
X.Y. Zhao ◽  
W.Q. Zhang ◽  
X.Y. Li ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Solid Solutions
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