Dual-frequency resonant phonon scattering in BaxRyCo4Sb12 (R=La, Ce, and Sr)

Yang, Jihui; Zhang, W.; Bai, Shengqiang; Mei, Zhi-Gang; Chen, Lidong

doi:10.1063/1.2737422

Cited by 229 publications

(161 citation statements)

References 32 publications

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“…This part of phonons would later decay into phonons incoherent with those of the absorbed phonons, and thus contribute to the lowed j L . 17 As shown in Fig. 6(b), below 700 K, j L for all samples decreases with increasing temperature, indicating that phonon transport is hindered by the dynamical process of Umklapp scattering.…”

Section: B Electrical Transport Propertiesmentioning

confidence: 92%

“…Moreover, recently, filling two or more types of fillers into the voids in skutterudite have been shown to be able to further reduce lattice thermal conductivity and improve ZT to 1.4 in double-filled and 1.7 in multiple-filled n-type skutterudites. [17][18][19][20] Although there are a series of recent study reported with very high ZTs in n-type partially filled skutterudites, only a few literatures focusing on high temperature thermoelectric properties in p-type skutterudites have been published in the past decade. Furthermore, the ZT values in p-type filled skutterudites are confirmed in experiment around 1.0, much lower than n-type materials.…”

Section: Introductionmentioning

confidence: 99%

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High-temperature electrical and thermal transport properties of fully filled skutterudites RFe4Sb12 (R = Ca, Sr, Ba, La, Ce, Pr, Nd, Eu, and Yb)

Qiu

Yang

Liu

et al. 2011

Journal of Applied Physics

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164

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Fully filled skutterudites RFe 4 Sb 12 (R ¼ Ca, Sr, Ba, La, Ce, Pr, Nd, Eu, and Yb) have been prepared and the high-temperature electrical and thermal transport properties are investigated systematically. Lattice constants of RFe 4 Sb 12 increase almost linearly with increasing the ionic radii of the fillers, while the lattice expansion in filled structure is weakly influenced by the filler valence charge states. Using simple charge counting, the hole concentration in RFe 4 Sb 12 with divalent fillers (R ¼ Ca, Sr, Ba, Eu, and Yb) is much higher than that in RFe 4 Sb 12 with trivalent fillers (R ¼ La, Ce, Pr, and Nd), resulting in relatively high electrical conductivity and low Seebeck coefficient. It is also found that RFe 4 Sb 12 filled skutterudites having similar filler valence charge states exhibit comparable electrical conductivity and Seebeck coefficient, and the behavior of the temperature dependence, thereby leading to comparable power factor values in the temperature range from 300 to 800 K. All RFe 4 Sb 12 samples possess low lattice thermal conductivity. The correlation between the lattice thermal resistivity W L and ionic radii of the fillers is discussed and a good relationship of W L $ (r cage Àr ion ) 3 is observed in lanthanide metal filled skutterudites. CeFe 4 Sb 12 , PrFe 4 Sb 12, and NdFe 4 Sb 12 show the highest thermoelectric figure of merit around 0.87 at 750 K among all the filled skutterudites studied in this work.

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Section: B Electrical Transport Propertiesmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

High-temperature electrical and thermal transport properties of fully filled skutterudites RFe4Sb12 (R = Ca, Sr, Ba, La, Ce, Pr, Nd, Eu, and Yb)

Qiu

Yang

Liu

et al. 2011

Journal of Applied Physics

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164

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“…The local vibrational frequency for Yb in skutterudite has been determined as 42 cm −1 , which is only about 1/3 of that for an alkaline element such as Sodium (Na) and 1/2 of that for an alkaline-earth element such as Barium (Ba). 12 In addition, the theoretical filling fraction limit (FFL theo ) for Yb obtained from the density functional method and thermodynamic analysis is about 0.20, much larger than that of most other rare-earth elements (e.g. Ce, Pr, and Nd).…”

Section: Introductionmentioning

confidence: 99%

Electrical and thermal transport properties of Y bxCo4Sb12 filled skutterudites with ultrahigh carrier concentrations

Qiu

Xiong³

et al. 2015

AIP Advances

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For filled skutterudites, element Yb is one of the most common and important fillers. However, the optimal carrier concentration range in Y bxCo4Sb12 filled skutterudites has not been determined as a result of the low Yb filling fraction limit. In this study, a non-equilibrium fabrication process (MS-SPS process), consisting of a melt-spinning method and a spark plasma sintering technique, has been applied to prepare Y bxCo4Sb12 samples. The Yb filling fraction is successfully extended to 0.35, which provides the possibility to clarify the optimal carrier concentration range for Yb-filled skutterudites. High carrier concentrations, with a maximum of around 1 × 1021 cm−3, were achieved in the MS-SPS Y bxCo4Sb12 samples due to the significantly enhanced Yb filling fractions. The phase compositions, lattice parameters, electrical and thermal transport properties of the MS-SPS Y bxCo4Sb12 samples with high carrier concentrations were systematically investigated. An optimal carrier concentration range of around 5 ∼ 6 × 1020 cm−3, corresponding to the actual Yb filling fraction of around 0.21∼0.26, has been determined, which displays the highest thermoelectric performance in Y bxCo4Sb12 thermoelectric materials.

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“…Theoretical determination of the resonant frequencies for a variety of fillers in 2007 was a milestone for the performance advance of filled CoSb 3 as it revealed the physical meaning of the previously merely fitting parameter. 131 Multiple filling was then proposed to scatter a broader range of phonons. Experimentally, by selecting rattling species such as Ba, La, Yb with frequencies of 93, 66, 42 cm − 1 , respectively, the κ L of such multiple filled CoSb 3 -based skutterudites was gradually reduced from values corresponding to single, to double and to multiple filled structures.…”

Section: Synergistic Optimisation For High Ztsmentioning

confidence: 99%

On the tuning of electrical and thermal transport in thermoelectrics: an integrated theory–experiment perspective

et al. 2016

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During the last two decades, we have witnessed great progress in research on thermoelectrics. There are two primary focuses. One is the fundamental understanding of electrical and thermal transport, enabled by the interplay of theory and experiment; the other is the substantial enhancement of the performance of various thermoelectric materials, through synergistic optimisation of those intercorrelated transport parameters. Here we review some of the successful strategies for tuning electrical and thermal transport. For electrical transport, we start from the classical but still very active strategy of tuning band degeneracy (or band convergence), then discuss the engineering of carrier scattering, and finally address the concept of conduction channels and conductive networks that emerge in complex thermoelectric materials. For thermal transport, we summarise the approaches for studying thermal transport based on phonon-phonon interactions valid for conventional solids, as well as some quantitative efforts for nanostructures. We also discuss the thermal transport in complex materials with chemical-bond hierarchy, in which a portion of the atoms (or subunits) are weakly bonded to the rest of the structure, leading to an intrinsic manifestation of part-crystalline part-liquid state at elevated temperatures. In this review, we provide a summary of achievements made in recent studies of thermoelectric transport properties, and demonstrate how they have led to improvements in thermoelectric performance by the integration of modern theory and experiment, and point out some challenges and possible directions. INTRODUCTION Thermoelectric (TE) materials are materials that can generate useful electric potentials when subjected to a temperature gradient (known as the Seebeck effect). Conversely, they also transfer heat against the temperature gradient when a current is driven against this potential (known as the Peltier effect). They are promising energy materials with many applications, such as waste heat harvesting, radioisotope TE power generation, and solid state Peltier refrigeration, all of which are driving growing research interest. A key challenge is to improve the TE properties in order to obtain more efficient energy conversion and in turn enable new practical applications. Good TE materials must have excellent electrical transport properties, measured by the TE power factor ( = S 2 σ, where S is the Seebeck coefficient and σ is the electrical conductivity), and also a very low thermal conductivity κ (composed of the electronic contribution κ e , the lattice contribution κ L , and the bipolar contribution κ bi ). Combining the two aspects gives us the dimensionless figure of merit ZT,

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Dual-frequency resonant phonon scattering in BaxRyCo4Sb12 (R=La, Ce, and Sr)

Cited by 229 publications

References 32 publications

High-temperature electrical and thermal transport properties of fully filled skutterudites RFe4Sb12 (R = Ca, Sr, Ba, La, Ce, Pr, Nd, Eu, and Yb)

High-temperature electrical and thermal transport properties of fully filled skutterudites RFe4Sb12 (R = Ca, Sr, Ba, La, Ce, Pr, Nd, Eu, and Yb)

Electrical and thermal transport properties of Y bxCo4Sb12 filled skutterudites with ultrahigh carrier concentrations

On the tuning of electrical and thermal transport in thermoelectrics: an integrated theory–experiment perspective

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