Mechanical Properties of Thermoelectric Ba8Al15Si31 Clathrate Prepared by Combining Arc Melting and Spark Plasma Sintering Techniques

Anno, Hiroaki; Ueda, Takahiro; Hirata, Shusaku; Kameyama, Tomoki; Iida, Tsutomu; Kogo, Yasuo

doi:10.1007/s11664-015-4230-6

Cited by 4 publications

(6 citation statements)

References 52 publications

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“…After writing that, most of the TE material nowadays suffer from low-volume fabrication, and specimens adequate with ASTM E 399 could not be machined. Therefore, most of the published data of fracture toughness were measured by different methods-the Vickers Indentation Hardness, Chevron Notch Flexure (detailed in ASTM C 1421 [35]), and recently a growing number of reports where nano-indentation had been used [19][20][21][22]. Another method, which was never utilized with TE materials, is the Chevron Notch Fracture Toughness (also known as the short rod) [36].…”

Section: Fracture Toughnessmentioning

confidence: 99%

“…AFM should be operated by an experienced and educated man power in order to acquire believable results (with low values of uncertainties and errors [44]) and to reduce the wearing of the system, which is quite expensive to maintain (mainly due to indenters' high fabrication costs). For further reading and understanding of nano-indentation, the reader may read the following reference [21].…”

Section: Nanoindentationmentioning

confidence: 99%

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Mechanical Properties of Thermoelectric Materials for Practical Applications

Guttmann¹,

Gelbstein²

2018

Bringing Thermoelectricity Into Reality

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Thermoelectric (TE) direct conversion of thermal energy into electricity is a novel renewable energy conversion method currently at a technological readiness level of 3-5 approaching laboratory prototypes. While approaching practical thermoelectric devices, an increase in the thermoelectric element's efficiency is needed at the entire service temperature range. Yet, the main focus of research was concentrated on the electronic properties of the materials, while research on the mechanical properties was left behind. As it is shown in this chapter, knowing and controlling the mechanical properties of TE materials are paramount necessities for approaching practical TEGs. The material's elastic constants, strength and fracture toughness are the most crucial parameters for designing of practical devices. The elastic constants provide understanding about the material's stiffness, while strength provides the loading conditions in which the material will keep its original shape. Knowing the fracture toughness provides the stress envelope in which the material could operate and its susceptibility to inherent fabrication faults. The characterization methods of these properties are varied and may be physical or pure mechanical in nature. It is the authors opinion to prefer the mechanical methods, so the results obtained will describe more accurately the material's response to mechanical loading.

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Section: Fracture Toughnessmentioning

confidence: 99%

Section: Nanoindentationmentioning

confidence: 99%

Mechanical Properties of Thermoelectric Materials for Practical Applications

Guttmann¹,

Gelbstein²

2018

Bringing Thermoelectricity Into Reality

View full text Add to dashboard Cite

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“…For further reading and understanding of nano-indentation, the reader may read the following reference. [52] Several TE materials were evaluated by this testing method and reported recently, such as Ba 8 Al 15 Si 31 [34] which was reported to have Young's modulus of 109.7 GPa (about 10% higher than the value calculated from the time of flight measurements) and Vickers hardness of 634HV which is in a good agreement to the micro-hardness value. Also p-and n-type half-Heusler [34] compositions showed Young's moduli of 221 & 186 GPa and hardness of 12.8 & 9.1 GPa, respectively.…”

Section: Nano Indentationmentioning

confidence: 65%

“…None the last, most of the TE material nowadays suffers from low volume fabrication, and specimens adequate with ASTM E 399 could not be machined. Therefore, most of the published data on fracture toughness were measured by different methods – the Vickers Indentation Hardness , Chevron Notch Flexure (detailed in [50] ), and recently a growing number of reports where Nano indentation had been used [34,40,51,52] . Another method that was never utilized with TE materials is the Chevron Notch Fracture Toughness (also known as the Short Rod) [53] .…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Therefore, most of the published data on fracture toughness were measured by different methods -the Vickers Indentation Hardness, Chevron Notch Flexure (detailed in [50] ), and recently a growing number of reports where Nano indentation had been used. [34,40,51,52] Another method that was never utilized with TE materials is the Chevron Notch Fracture Toughness (also known as the Short Rod). [53] Most recently Li et al [54] suggested a new approach to derive the fracture toughness of TE materials utilizing ab-initio density functional theory, DFT, calculations.…”

Section: Fracture Toughnessmentioning

confidence: 99%

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The Mechanical Properties of Inorganic Thermoelectric Materials: A Review on Characterization Methods and Correlations

Guttmann

Haroush²,

Gelbstein

2022

ChemNanoMat

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The conversion of thermal energy into electricity can be successfully applied by novel renewable energy known as thermoelectricity (TE). Such thermoelectric generators (TEGs) are currently at a technological readiness level (TRL) of 3–5 (out of a level of 10) approaching laboratory prototypes. One of the major setbacks to achieve higher TRLs is the fact that the focus of research is concentrated on improving the electronic/transport properties (mainly affecting the figure of merit – ZT) of the materials, while the research on the mechanical properties and the material‘s ability to adhere service conditions was left behind. Information about the mechanical properties of TE materials – elastic constants (e. g. Young's modulus and Poisson's ratio), strength, and fracture toughness – are paramount necessities (but not the only ones) for approaching practical TEGs. The elastic constants provide an understanding of the material‘s stiffness, while the strength and fracture toughness provide the loading conditions the material can endure. This work summarizes the various mechanical properties and measuring methods along with all up‐to‐date published data of these properties for inorganic TE materials. This work aims to expose the TE community to the under‐looked and nearly untreated field of research. Also, for the first time, a statistical analysis of the collected data was employed to highlight cross relations between mechanical, and physical properties and those who had a high Pearson's correlation parameter are presented. These correlations in turn have the potential to expedite the development and screening of inorganic TE materials for the various applications needed.

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