4.8 Article

Enhanced thermoelectric figure-of-merit in 'defective' half-Heusler Nb0.8CoSb

Related references

Note: Only part of the references are listed.
Article Crystallography

Crystal growth of defectivehalf-Heusler Nb0.83CoSb

Kumar Saurabh et al.

Summary: ‘Defective’ half Heuslers are a new class of defect stabilized Heusler alloys with a cubic structure and vacancies at the X-site. The presence of vacancies leads to suppressed thermal conductivity and vacancy ordering, which is still unresolved. High-quality single-crystals of these materials are useful for advanced spectroscopy experiments. The crystal growth of Nb0.83CoSb using the chemical vapor transport technique is reported in this study.

JOURNAL OF CRYSTAL GROWTH (2023)

Article Engineering, Electrical & Electronic

Interplay Between Electronic States and Structural Stability in Cation-Deficient VCoSb, NbCoSb, and TaCoSb Half-Heuslers

Joaquin Miranda et al.

Summary: The effects of vacancy concentration at the cation site in three half-Heusler materials, VCoSb, NbCoSb, and TaCoSb, were investigated using density functional theory and Monte Carlo simulations. It was found that the transition from metallic to semiconducting behavior in VCoSb was due to an increase in vacancy concentration, while NbCoSb and TaCoSb exhibited a gap opening at 20% vacancies. Additionally, cluster expansion analysis revealed that Ta0.8CoSb is slightly more stable than Nb0.8CoSb, while V0.8CoSb is the least stable. Temperature effects showed the formation of metastable states upon cooling, making it difficult to recover the ground state.

JOURNAL OF ELECTRONIC MATERIALS (2022)

Article Chemistry, Multidisciplinary

Modular Nanostructures Facilitate Low Thermal Conductivity and Ultra-High Thermoelectric Performance in n-Type SnSe

Sushmita Chandra et al.

Summary: This study reports the record high thermoelectric performance of n-type polycrystalline SnSe0.92 + x mol% MoCl5 samples, achieved through the optimization of carrier concentration and enhanced phonon scattering by incorporating modular nano-heterostructures in SnSe matrix. The modular nanostructures significantly scatter phonons, resulting in ultra-low lattice thermal conductivity and high thermoelectric performance in n-type SnSe.

ADVANCED MATERIALS (2022)

Article Chemistry, Physical

Sublattice Short-Range Order and Modified Electronic Structure in Defective Half-Heusler Nb0.8CoSb

Shihua Tan et al.

Summary: NbCoSb, a 19-electron half-Heusler compound, can be stabilized at about Nb0.8CoSb by introducing Nb vacancies, showing a unique coexistence of short-range order and long-range disorder. The distribution of vacancies in the compound deviates from uniform distribution, with a characteristic shell distance of about 7.26 angstrom. The modified band structure of Nb0.8CoSb predicts widening of conduction-band minimum and valence-band maximum, existence of defective states in the gap area, and potential observation of gap reduction.

JOURNAL OF PHYSICAL CHEMISTRY C (2021)

Review Materials Science, Multidisciplinary

Advances in half-Heusler alloys for thermoelectric power generation

Robert J. Quinn et al.

Summary: Half-Heusler alloys have become leading candidate materials for thermoelectric power generation, with substantial improvements achieved through experimental work and fundamental insight. Materials synthesis and compositional optimisation guided by empirical modelling play a key role in extracting higher performance from these alloys.

MATERIALS ADVANCES (2021)

Article Chemistry, Multidisciplinary

A simple model for vacancy order and disorder in defective half-Heusler systems

Nikolaj Roth et al.

IUCRJ (2020)

Article Chemistry, Multidisciplinary

Short-range order in defective half-Heusler thermoelectric crystals

Kaiyang Xia et al.

ENERGY & ENVIRONMENTAL SCIENCE (2019)

Article Materials Science, Multidisciplinary

Low thermal conductivity and promising thermoelectric performance in AxCoSb (A = V, Nb or Ta) half-Heuslers with inherent vacancies

Daniella A. Ferluccio et al.

JOURNAL OF MATERIALS CHEMISTRY C (2019)

Article Chemistry, Multidisciplinary

Enhanced Thermoelectric Performance in 18-Electron Nb0.8CoSb Half-Heusler Compound with Intrinsic Nb Vacancies

Kaiyang Xia et al.

ADVANCED FUNCTIONAL MATERIALS (2018)

Article Materials Science, Multidisciplinary

Synthesis and Thermoelectric Properties of Ni-Doped ZrCoSb Half-Heusler Compounds

Degang Zhao et al.

METALS (2018)

Article Chemistry, Physical

Temperature Dependent n-Type Self Doping in Nominally 19-Electron Half-Heusler Thermoelectric Materials

Shashwat Anand et al.

ADVANCED ENERGY MATERIALS (2018)

Article Chemistry, Physical

The effect of Sn doping on thermoelectric performance of n-type half-Heusler NbCoSb

Lihong Huang et al.

PHYSICAL CHEMISTRY CHEMICAL PHYSICS (2017)

Review Multidisciplinary Sciences

Advances in thermoelectric materials research: Looking back and moving forward

Jian He et al.

SCIENCE (2017)

Article Chemistry, Physical

Using the 18-Electron Rule To Understand the Nominal 19-Electron Half-Heusler NbCoSb with Nb Vacancies

Wolfgang G. Zeier et al.

CHEMISTRY OF MATERIALS (2017)

Review Nanoscience & Nanotechnology

Engineering half-Heusler thermoelectric materials using Zintl chemistry

Wolfgang G. Zeier et al.

NATURE REVIEWS MATERIALS (2016)

Article Nanoscience & Nanotechnology

Enhanced thermoelectric properties of n-type NbCoSn half-Heusler by improving phase purity

Ran He et al.

APL MATERIALS (2016)

Article Materials Science, Multidisciplinary

A new n-type half-Heusler thermoelectric material NbCoSb

Lihong Huang et al.

MATERIALS RESEARCH BULLETIN (2015)

Article Physics, Condensed Matter

Short-range order in disordered transition metal oxides, carbides, and nitrides with the B1 structure

M. G. Kostenko et al.

PHYSICS OF THE SOLID STATE (2015)

Article Nanoscience & Nanotechnology

Characterization of Lorenz number with Seebeck coefficient measurement

Hyun-Sik Kim et al.

APL MATERIALS (2015)

Article Multidisciplinary Sciences

Topological RPdBi half-Heusler semimetals: A new family of noncentrosymmetric magnetic superconductors

Yasuyuki Nakajima et al.

SCIENCE ADVANCES (2015)

Article Multidisciplinary Sciences

Ultralow thermal conductivity and high thermoelectric figure of merit in SnSe crystals

Li-Dong Zhao et al.

NATURE (2014)

Review Materials Science, Multidisciplinary

Recent progress of half-Heusler for moderate temperature thermoelectric applications

Shuo Chen et al.

MATERIALS TODAY (2013)

Review Engineering, Electrical & Electronic

Half-Heusler compounds: novel materials for energy and spintronic applications

F. Casper et al.

SEMICONDUCTOR SCIENCE AND TECHNOLOGY (2012)