scholarly journals Structure, electrical conductivity and oxygen transport properties of Ruddlesden–Popper phases Lnn+1NinO3n+1 (Ln = La, Pr and Nd; n = 1, 2 and 3)

2020 ◽  
Vol 8 (42) ◽  
pp. 22206-22221
Author(s):  
Jia Song ◽  
De Ning ◽  
Bernard Boukamp ◽  
Jean-Marc Bassat ◽  
Henny J. M. Bouwmeester
Keyword(s):  
Electrical Conductivity ◽  
Transport Properties ◽  
Oxygen Transport ◽  
Electronic Transport ◽  
Layered Structure ◽  
Electronic Transport Properties ◽  
Oxygen Ion

Correlating oxygen-ion and electronic transport properties of Ruddlesden–Popper-type nickelates with their layered structure.

scholarly journals Structure, electrical conductivity and oxygen transport properties of perovskite-type oxides CaMn1−x−yTixFeyO3−δ

2019 ◽  
Vol 21 (39) ◽  
pp. 21824-21835 ◽  
Author(s):  
Rian Ruhl ◽  
Jia Song ◽  
Vincent Thoréton ◽  
Sathya Prakash Singh ◽  
Kjell Wiik ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Transport Properties ◽  
Oxygen Transport ◽  
Electronic Transport ◽  
Structural Changes ◽  
Electronic Transport Properties ◽  
Perovskite Type

Correlating ionic and electronic transport properties with structural changes in perovskite-type oxides CaMn1−x−yTixFeyO3−δ (CMTF).

Electronic Transport Properties of Hot-Pressed B6Si

1987 ◽  
Vol 97 ◽  
Author(s):  
C. Wood ◽  
D. Emin ◽  
R. S. Feigelson ◽  
I. D. R. Mackinnon
Keyword(s):  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Electronic Transport ◽  
Hall Mobility ◽  
Anomalous Behavior ◽  
Nominal Composition ◽  
Electronic Transport Properties ◽  
Increasing Temperature ◽  
P Type

ABSTRACTMeasurements of the electrical conductivity, Seebeck coefficient and Hall mobility from -300 K to -1300 K have been carried out on multiphase hotpressed samples of the nominal composition B6Si. In all samples the conductivity and the p-type Seebeck coefficient both increase smoothly with increasing temperature. By themselves, these facts suggest small-polaronic hopping between inequivalent sites. The measured Hall mobilities are always low, but vary in sign. A possible explanation is offered for this anomalous behavior.

scholarly journals Synthesis and Characterization of Thermoelectric Co2XSn (X = Zr, Hf) Heusler Alloys

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 624
Author(s):  
Alessandro Difalco ◽  
Francesco Aversano ◽  
Stefano Boldrini ◽  
Alberto Ferrario ◽  
Marcello Baricco ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Curie Temperature ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Power Factor ◽  
Electronic Transport ◽  
Waste Heat ◽  
Heusler Alloys ◽  
Secondary Phases ◽  
Electronic Transport Properties

In this work, we report the results of an experimental investigation on the synthesis, structure, microstructure, mechanical, electrical conductivity, and Seebeck coefficient of Co2XSn (X = Zr, Hf) alloys. In both the alloys, the main constituent is a full Heusler-type compound that coexists with small amounts of secondary phases. Both alloys show a rather high Vickers hardness (around 900 HV) and an indentation fracture toughness typical of ceramics (around 2 MPa·m1/2). The electronic transport properties of the two alloys were measured for the first time. The temperature dependence of both the Seebeck coefficient and the electrical conductivity of the two alloys shows a change in correspondence of the Curie temperature. The Seebeck coefficient reaches a constant plateau, while the electrical conductivities show a transition from metallic to semiconductor behavior. As a consequence, almost constant values of the power factor have been obtained for the power factor above the Curie temperature, which is promising for an efficient exploitation of thermal gradients of several hundreds of degree in waste heat harvesting applications. Finally, on the basis of results from this work and from the literature, the effect of the substitution of the X element on the electronic transport properties in the series Co2XSn (X = Ti, Zr, Hf) is discussed.

scholarly journals Effect of the Dopant Configuration on the Electronic Transport Properties of Nitrogen-Doped Carbon Nanotubes

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 199
Author(s):  
Kim Eklund ◽  
Antti J. Karttunen
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Transport Properties ◽  
Electronic Transport ◽  
Density Functional ◽  
Nitrogen Doped ◽  
Electronic Transport Properties ◽  
Boltzmann Transport Theory ◽  
Nitrogen Doped Carbon ◽  
Hybrid Density Functional

Nitrogen-doped carbon nanotubes (N-CNTs) show promise in several applications related to catalysis and electrochemistry. In particular, N-CNTs with a single nitrogen dopant in the unit cell have been extensively studied computationally, but the structure-property correlations between the relative positions of several nitrogen dopants and the electronic transport properties of N-CNTs have not been systematically investigated with accurate hybrid density functional methods. We use hybrid density functional theory and semiclassical Boltzmann transport theory to systematically investigate the effect of different substitutional nitrogen doping configurations on the electrical conductivity of N-CNTs. Our results indicate significant variation in the electrical conductivity and the relative energies of the different dopant configurations. The findings can be utilized in the optimization of electrical transport properties of N-CNTs.

scholarly journals Impact of Fermi Surface Shape Engineering on Calculated Electronic Transport Properties of Bi-Sb-Te

2021 ◽  
Vol 59 (1) ◽  
pp. 54-60
Author(s):  
Sang-il Kim ◽  
Jong-Chan Lim ◽  
Heesun Yang ◽  
Hyun-Sik Kim
Keyword(s):  
Electrical Conductivity ◽  
Fermi Surface ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Effective Mass ◽  
Power Factor ◽  
Electronic Transport ◽  
Surface Shape ◽  
Thermoelectric Performance ◽  
Electronic Transport Properties

Using thermoelectric refrigerators can address climate change because they do not utilize harmful greenhouse gases as refrigerants. To compete with current vapor compression cycle refrigerators, the thermoelectric performance of materials needs to be improved. However, improving thermoelectric performance is challenging because of the trade-off relationship between the Seebeck coefficient and electrical conductivity. Here, we demonstrate that decreasing conductivity effective mass by engineering the shape of the Fermi surface pocket (non-parabolicity factor) can decouple electrical conductivity from the Seebeck coefficient. The effect of engineering the non-parabolicity factor was shown by calculating the electronic transport properties of a state-of-the-art Bi-Sb-Te ingot via two-band model with varying non-parabolicity. The power factor (the product of the Seebeck coefficient squared and electrical conductivity) was calculated to be improved because of enhanced electrical conductivity, with an approximately constant Seebeck coefficient, using a non-parabolicity factor other than unity. Engineering the non-parabolicity factor to achieve lighter conductivity effective mass can improve the electronic transport properties of thermoelectric materials because it only improves electrical conductivity without decreasing the Seebeck coefficient (which is directly proportional to the band mass of a single Fermi surface pocket and not to the conductivity effective mass). Theoretically, it is demonstrated that a thermoelectric figure-of-merit <i>zT</i> higher than 1.3 can be achieved with a Bi-Sb-Te ingot if the non-parabolicity factor is engineered to be 0.2. Engineering the non-parabolicity factor is another effective band engineering approach, similar to band convergence, to achieve an effective improvement in power factor.

Improved zT in Nb5Ge3 - GeTe Thermoelectric Nanocomposite

Nanoscale ◽  
2021 ◽  
Author(s):  
Cao Jing ◽  
Xian Yi Tan ◽  
Ning Jia ◽  
Da Lan ◽  
Samantha Faye Duran Solco ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Transport Properties ◽  
Electronic Transport ◽  
High Performance ◽  
High Electrical Conductivity ◽  
Electronic Transport Properties

Robust electronic transport properties is a crucial in designing high performance thermoelectrics. A key similarity between superconductor and thermoelectric lies in their generally high electrical conductivity, even at above its...

ELECTRONIC TRANSPORT PROPERTIES OF SILICON NANOWIRE CAGE

2018 ◽  
Author(s):  
Shenqiu Mo ◽  
Dengke Ma ◽  
Lina Yang ◽  
Meng An ◽  
Zhiyu Liu ◽  
...  
Keyword(s):  
Transport Properties ◽  
Electronic Transport ◽  
Silicon Nanowire ◽  
Electronic Transport Properties

Improved thermoelectric transport properties of Ge4Se3Te through dimensionality reduction

2021 ◽  
Author(s):  
H. H. Huang ◽  
Xiaofeng Fan ◽  
Wei Tao Zheng ◽  
David J. Singh
Keyword(s):  
Dimensionality Reduction ◽  
Transport Properties ◽  
Electronic Transport ◽  
Thermoelectric Transport ◽  
Electronic Transport Properties ◽  
Thermoelectric Transport Properties

Layered semiconducting Ge4Se3Te shows unusual bonding that suggests the possibility of unusual transport that may be favorable for thermoelectrics. We investigated the electronic transport properties in relation to thermoelectricity of...

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