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Solute manipulation enabled band and defect engineering for thermoelectric enhancements of SnTe

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InfoMat 2019年第4期1卷 571-581页

作者： Zhichao Yao Wen Li Jing Tang Zhiwei Chen Siqi Lin Kanishka Biswas Alexander burkov Yanzhong Pei Interdisciplinary Materials Research Center School of Materials Science and EngineeringTongji UniversityShanghaiChina Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR) BangaloreIndia Laboratory for Physics of Thermoelements Ioffe InstituteSankt-PetersburgRussia

With years of development, SnTe as a homologue of PbTe has shown great potentialfor thermoelectric applications in p-type conduction, and the most successfulstrategy is typified by alloying for maximizing the valence band degeneracy.Among the known alloy agents, MnTe has been found to be one of the most effectiveenabling a band convergence for an enhancement in electronic performance ofSnTe, yet its solubility of only ~15 at% unfortunately prevents a full optimizationin the valence band structure. This work reveals that additional PbTe alloying notonly promotes the MnTe solubility to locate the optimal valence band structure butalso increases the overall substitutional defects in the material for a substantialreduction in lattice thermal conductivity. In addition, PbTe alloying simultaneouslyoptimizes the carrier concentration due to the cation size effect. These features allenabled by such a solute manipulation synergistically lead to a very high thermoelectricfigure of merit, zT of ~1.5 in SnTe with a 20 at% MnTe and a 30 at% PbTealloying (Sn0.5Mn0.2Pb0.3Te), demonstrating the effectiveness of solute manipulationfor advancing SnTe and similar thermoelectrics.

关键词： band engineering MnTe solubility SnTe thermoelectric

Influence of Carbon Content of WC-Co Electrode Materials on the Wear Resistance of Electrospark Coatings

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Journal of Surface Engineered Materials and Advanced Technology 2012年第2期2卷 65-70页

作者： Alexander A. burkov Sergey A. Pyachin Alexey V. Zaytsev Institute of Materials Khabarovsk Scientific Centre Far East Branch Russian Academy of Sciences Khabarovsk Russia.

In the electrospark deposition (ESD) of WC-Co materials on low carbon steel, tungsten carbide (WC) decarburization is observed. The use of an inert atmosphere (argon) does not eliminate the problem of tungsten carbide decarburization during electrospark processing. The effect of the carbon concentration of electrode materials on the phase composition and mechanical properties of WC (10 wt% of Co) ESD coatings has been investigated in this work. The introduction of additional carbon (graphite) in the electrode material on the basis of the WC-10%Co leads to an increased amount of WC in the obtained coatings and thus improves their wear resistance.

关键词： Hard Coating Electrospark Deposition Tungsten Carbide Wear

Electrospark Coatings Based on WC-Co Alloys with Aluminium Oxide and Carbon Additives

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Materials Sciences and Applications 2013年第3期4卷 186-190页

作者： Sergey A. Pyachin Sergey V. Nikolenko Alexander A. burkov Nikolay A. Suy Institute of Materials Khabarovsk Scientific Centre Far East Branch Russian Academy of Sciences Khabarovsk Russia.

The structure and properties of coatings based on WC-Co alloys containing additives of 1% - 5% aluminium oxide and 2.5% - 4.5% carbon were investigated. The coatings had a nanocrystalline structure. Depending on the duration and frequency of the discharge pulses, the ratio between WC and W2C in the coatings was different. The additives in the hard alloy allowed us increase the microhardness and wear resistance of the coatings by a factor of 2 - 3 in comparison to coatings created using a conventional WC-10%Co alloy.

关键词： Electrospark Deposition Coatings Tungsten Carbide Carbon Aluminium Oxide Wear Microhardness

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机器学习精讲

作者： (加)安德烈·布可夫(Andriy burkov)

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球状晶体中的拉曼散射和布拉格衍射(英文)

光散射学报 2005年第3期17卷 268-269页

作者： V.I. burkov V.S. Gorelik N.N. Melnik P.P. Sverbil S.N. Ivicheva L.I. Zlobina A.V. ChervyakovDepartment of Physics Moscow State University Moscow Russia Moscow Institute of Physics and Technology Institutskii per. 9 Dolgoprudny Moscow Region 141700 RussiaP.N. Lebedev Physical Institute of Russian Academy of Sciences Leninsky prosp. 53 Moscow 119991 Russia. P.N. Lebedev Physical Institute of Russian Academy of Sciences Leninsky prosp. 53 Moscow 119991 Russia. P.N. Lebedev Physical Institute of Russian Academy of Sciences Leninsky prosp. 53 Moscow 119991 Russia. I.S. Kurnakov Common and Inorganic Chemistry Institute of Russian Academy of Sciences Leninskii prosp. 31 Moscow RussiaInstitute of Russian Academy of Sciences Leninsky prosp. 53 Moscow 119991 Russia.

The results of optical properties investigations for some types of globular crystals, including artifical opals and amorphous substances, constructed from the globular nanoclusters are represented. The spectra of light reflection from the surface of received opals have investigated at different incident angle (under mirror-reflection geometry): 0, 20, 30, 45 and 60 degree.

关键词：球状晶体拉曼散射布拉格衍射光学性质光谱

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球状晶体中的拉曼散射和布拉格衍射(英文)

光散射学报 2005年第3期 80-81页

作者： V.I. burkov,V.S. Gorelik,N.N. Melnik,P.P. Sverbil,S.N. Ivicheva,L.I. Zlobina,A.V. ChervyakovDepartment of Physics, Moscow State University, Moscow, 119992, Russia 119991 Russia. P.N. Lebedev Physical Institute of Russian Academy of Sciences Leninsky prosp. 53 Moscow 119991 Russia. P.N. Lebedev Physical Institute of Russian Academy of Sciences Leninsky prosp. 53 Moscow Moscow Institute of Physics and Technology 119991 Russia. I.S. Kurnakov Common and Inorganic Chemistry Institute of Russian Academy of Sciences Leninskii prosp. 31 Moscow Russia Institute of Russian Academy of Sciences Leninsky prosp. 53 Moscow 119991 Institutskii per. 9 Russia. Dolgoprudny Moscow Region 141700 Russia P.N. Lebedev Physical Institute of Russian Academy of Sciences Leninsky prosp. 53 Moscow

关键词： nm