Effects of Ni Magnetic Nanoparticles on Thermoelectric Properties of n-Type Bi2Te2.7Se0.3 Materials

Ma, Shifang; Li, Cuncheng; Lin, Xiaodong; Mu, Xin; Zhu, Wanting; Nie, Xiaolei; Sang, Xiahan; Wei, Ping; Zhang, Qingjie; Zhao, Wenyu

doi:10.1007/s11664-020-07956-8

Cited by 12 publications

(2 citation statements)

References 37 publications

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“…In this section, the effect of magnetic materials embedded in the nonmagnetic TE materials has been studied [392]. There have been a lot of studies where, adding the magnetic materials through different doping elements such as Ag [449], Cr [450,451], Lu/Tm [451], Fe [452], nano-precipitates [453] and nanoinclusions Fe 3 O 4 /YbAl 3 [454], Ni/Bi 2 Te 2.7 Se 0.3 [455] has introduced more degree of freedom to influence the transport parameters. Doping through light and magnetic elements is an effective approach to improve the TE properties.…”

Section: Effect Of Magnetic Ion Dopingmentioning

confidence: 99%

Physics and technology of thermoelectric materials and devices

Dadhich

Saminathan

Kumari

et al. 2023

J. Phys. D: Appl. Phys.

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The continuous depletion of fossil fuels and the increasing demand for eco-friendly and sustainable energy sources have prompted researchers to look for alternative energy sources. The loss of thermal energy in heat engines (100-350 ºC), coal-based thermal plants (150-700 ºC), heated water pumping in the geothermal process (150-700 ºC), and burning of petrol in the automobiles (150-250 ºC) in form of untapped waste-heat can be directly and/or reversibly converted into usable electricity by means of charge carriers (electrons or holes) as moving fluids using thermoelectric (TE) technology, which works based on typical Seebeck effect. The enhancement in TE conversion efficiency has been a key challenge because of the coupled relation between thermal and electrical transport of charge carriers in a given material. In this review, we have deliberated the physical concepts governing the materials to device performance as well as key challenges for enhancing the TE performance. Moreover, the role of crystal structure in the form of chemical bonding, crystal symmetry, order-disorder and phase transition on charge carrier transport in the material has been explored. Further, this review has also emphasized some insights on various approaches employed recently to improve the TE performance, such as, (i). carrier engineering via band engineering, low dimensional effects, and energy filtering effects and (ii). Phonon engineering via doping/alloying, nano-structuring, embedding secondary phases in the matrix and microstructural engineering. Wehave also briefed the importance of magnetic elements on thermoelectric properties of the selected materials and spin Seebeck effect. Furthermore, the design and fabrication of TE modules and their major challenges are also discussed. As, thermoelectric figure of merit, zT does not have any theoretical limitation, an ideal high performance thermoelectric device should consist of low-cost, eco-friendly, efficient, n- or p-type materials that operate at wide- temperature range and similar coefficients of thermal expansion, suitable contact materials, less electrical/ thermal losses and constant source of thermal energy. Overall, this review provides the recent physical concepts adopted and fabrication procedures of TE materials and device so as to improve the fundamental understanding and to develop a promising TE device.

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Section: Effect Of Magnetic Ion Dopingmentioning

confidence: 99%

Physics and technology of thermoelectric materials and devices

Dadhich

Saminathan

Kumari

et al. 2023

J. Phys. D: Appl. Phys.

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“…metallic compounds with high thermal and electrical conductivities and rather small but significant Seebeck coefficients. [11,12] The high electrical conductivity of NiTe 2 [12,13] is expected to significantly influence the properties of the high-quality thermoelectric material Sn 12 Sb 2 Te 15 so that obvious effects can be demonstrated. Series of composites then show clear trends, which can ARTICLE additionally be verified by means of the classical effective medium approximation with "mixture rules" for the estimation of the resistivity of heterogeneous mixtures.…”

Section: Introductionmentioning

confidence: 99%

Hall‐effect Measurements and Transport Properties of Heterostructures in the Model System NiTe₂‐Sn₁₂Sb₂Te₁₅

Fraunhofer

Schwarzmüller

Gardiner

et al. 2020

Zeitschrift anorg allge chemie

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In composite materials of NaCl‐type Sn12Sb2Te15 with x equivalents of CdI2‐type NiTe2 (x = 0.2; 1; 2), both phases are stable from room temperature up to 500 °C without a significant extent of mutual doping. The thermoelectric properties of this model system, complemented by Hall measurements, show clear trends with increasing x. Both electrical and thermal conductivities increase significantly whilst Seebeck coefficients decrease due to an increase in charge carrier concentrations. The overall Figure of merit zT is slightly impaired upon heterostructuring with NiTe2. However, the good reproducibility and cyclability of the measurements renders these composites an intriguing model system to qualitatively examine the applicability of a simple single parabolic band (SPB) model based on Hall‐effect data to rather metallic heterostructures. This model is best applicable to composites with lower fractions of NiTe2 and gives the direction for tuning the charge carrier concentrations toward the optimum upon heterostructuring. These findings are in accordance with B‐factor analysis and classical effective medium theory for spheroidal precipitates.

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Enhanced Thermoelectric Performance in Vacancy‐Filling Heuslers due to Kondo‐Like Effect

Chen,

Dong,

et al. 2024

Advanced Materials

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To improve thermoelectric efficiency, various tactics have been employed with considerable success to decouple intertwined material attributes. However, the integration of magnetism, derived from the unique spin characteristic that other methods cannot replicate, has been comparatively underexplored and presents an ongoing intellectual challenge. A previous research has shown that vacancy‐filling Heuslers offer a highly adaptable framework for modulating thermoelectric properties. Here, it is demonstrated how intrinsic magnetic‐electrical‐thermal coupling can enhance the thermoelectric performance of vacancy‐filling Heusler alloys. The materials, Nb0.75Ti0.25FeCrxSb with 0 ≤ x ≤ 0.1, feature a fraction of magnetic Cr ions that randomly occupy the vacancy sites of the Nb0.75Ti0.25FeSb half‐Heusler matrix. These alloys achieve a remarkable thermoelectric figure of merit (zT) of 1.21 at 973 K, owing to increased Seebeck coefficient and decreased thermal conductivity. The mechanism is primarily due to the introduction of magnetism, which increases the density‐of‐states effective mass (reaching levels up to 15 times that of a free electron's mass) and simultaneously reduces the electronic thermal conductivity. Mass and strain‐field fluctuations further reduce the lattice thermal conductivity. Even higher zT values can potentially be achieved by carefully balancing electron mobility and effective mass. This work underscores the substantial prospects for exploiting magnetic‐electrical‐thermal synergies in cutting‐edge thermoelectric materials.

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Effects of Ni Magnetic Nanoparticles on Thermoelectric Properties of n-Type Bi2Te2.7Se0.3 Materials

Cited by 12 publications

References 37 publications

Physics and technology of thermoelectric materials and devices

Physics and technology of thermoelectric materials and devices

Hall‐effect Measurements and Transport Properties of Heterostructures in the Model System NiTe₂‐Sn₁₂Sb₂Te₁₅

Enhanced Thermoelectric Performance in Vacancy‐Filling Heuslers due to Kondo‐Like Effect

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Effects of Ni Magnetic Nanoparticles on Thermoelectric Properties of n-Type Bi2Te2.7Se0.3 Materials

Cited by 12 publications

References 37 publications

Physics and technology of thermoelectric materials and devices

Physics and technology of thermoelectric materials and devices

Hall‐effect Measurements and Transport Properties of Heterostructures in the Model System NiTe2‐Sn12Sb2Te15

Enhanced Thermoelectric Performance in Vacancy‐Filling Heuslers due to Kondo‐Like Effect

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Hall‐effect Measurements and Transport Properties of Heterostructures in the Model System NiTe₂‐Sn₁₂Sb₂Te₁₅