Enhanced thermoelectric performance of GeTe-rich germanium antimony tellurides through the control of composition and structure

CrystEngComm ◽  
2015 ◽  
Vol 17 (18) ◽  
pp. 3440-3445 ◽  
Author(s):  
Raman Sankar ◽  
Deniz P. Wong ◽  
Chiao-Song Chi ◽  
Wei-Lun Chien ◽  
Jih-Shang Hwang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermoelectric Performance ◽  
Antimony Telluride ◽  
Composition And Structure ◽  
Germanium Antimony Telluride ◽  
Subsequent Quenching

Enhancement of the thermoelectric performance of GeTe-rich germanium antimony telluride (GeSbTe or GST) is demonstrated through marginal changes in composition and subsequent quenching of crystal structure.

Crystal Structure Analysis of Cu-Zr Alloys by Convergent Beam Diffraction

1981 ◽  
Vol 39 ◽  
pp. 354-355
Author(s):  
A. F. Marshall ◽  
J. W. Steeds ◽  
D. Bouchet ◽  
S. L. Shinde ◽  
R. G. Walmsley
Keyword(s):  
Crystal Structure ◽  
Point Group ◽  
Intermetallic Phase ◽  
Three Dimensional ◽  
Crystal Structure Analysis ◽  
Ion Milling ◽  
Composition And Structure ◽  
Unit Cells ◽  
Sputter Deposited ◽  
Convergent Beam

Convergent beam electron diffraction is a powerful technique for determining the crystal structure of a material in TEM. In this paper we have applied it to the study of the intermetallic phases in the Cu-rich end of the Cu-Zr system. These phases are highly ordered. Their composition and structure has been previously studied by microprobe and x-ray diffraction with sometimes conflicting results.The crystalline phases were obtained by annealing amorphous sputter-deposited Cu-Zr. Specimens were thinned for TEM by ion milling and observed in a Philips EM 400. Due to the large unit cells involved, a small convergence angle of diffraction was used; however, the three-dimensional lattice and symmetry information of convergent beam microdiffraction patterns is still present. The results are as follows:1) 21 at% Zr in Cu: annealed at 500°C for 5 hours. An intermetallic phase, Cu3.6Zr (21.7% Zr), space group P6/m has been proposed near this composition (2). The major phase of our annealed material was hexagonal with a point group determined as 6/m.

IMPROVEMENT OF THE CHEMICAL COMPOSITION AND STRUCTURE OF CASTABLE NICKEL-BASED SUPERALLOY WITH LOW DENSITY. Part 2

2021 ◽  
pp. 3-15
Author(s):  
N.V. Petrushin ◽  
◽  
E.M. Visik ◽  
E.S. Elyutin ◽  
◽  
...  
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Turbine Blades ◽  
Experimental Studies ◽  
Single Crystal Structure ◽  
Term Strength ◽  
Nickel Based Superalloy ◽  
Heat Treated ◽  
Composition And Structure ◽  
Short Term Strength

Results of design and experimental studies of a nickel-based superalloy VZhL20 with a density of 8.04 g/cm3 for the manufacture of turbine blades with a columnar granular structure and a single-crystal structure are presented. It is shown that alloy VZHL20 with a single-crystal structure of the crystallographic orientation [001] in the heat-treated state possesses high phase stability, and enhanced short-term strength ( = 950 MPa, = 1130 MPa), and long-term strength ( = 340 MPa, = 185 MPa).

An insight into β-Zn4Sb3 from its crystal structure, thermoelectric performance, thermal stability and graded material

2017 ◽  
Vol 3 ◽  
pp. 72-83 ◽  
Author(s):  
Jian Yang ◽  
Guiwu Liu ◽  
Zhongqi Shi ◽  
Jianping Lin ◽  
Xiang Ma ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Thermoelectric Performance ◽  
Graded Material ◽  
Insight Into

Realizing High Thermoelectric Performance in p-Type SnSe through Crystal Structure Modification

2018 ◽  
Vol 141 (2) ◽  
pp. 1141-1149 ◽  
Author(s):  
Bingchao Qin ◽  
Dongyang Wang ◽  
Wenke He ◽  
Yang Zhang ◽  
Haijun Wu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermoelectric Performance ◽  
Structure Modification ◽  
P Type

scholarly journals Synthesis and crystal structure of (E)-1,2-bis[2-(methylsulfanyl)phenyl]diazene

2019 ◽  
Vol 75 (11) ◽  
pp. 1808-1811
Author(s):  
Jonas Hoffmann ◽  
Thomas J. Kuczmera ◽  
Enno Lork ◽  
Anne Staubitz
Keyword(s):  
Crystal Structure ◽  
Dimethyl Disulfide ◽  
Hirshfeld Surface ◽  
The Other ◽  
Inversion Symmetry ◽  
Asymmetric Unit ◽  
Synthesis And Crystal Structure ◽  
Compound C ◽  
Azo Group ◽  
Subsequent Quenching

The title compound, C14H14N2S2, was obtained by transmetallation of 2,2′-bis(trimethylstannyl)azobenzene with methyl lithium, and subsequent quenching with dimethyl disulfide. The asymmetric unit comprises two half-molecules, the other halves being completed by inversion symmetry at the midpoint of the azo group. The two molecules show only slight differences with respect to N=N, S—N and aromatic C=C bonds or angles. Hirshfeld surface analysis reveals that except for one weak H...S interaction, intermolecular interactions are dominated by van der Waals forces only.

scholarly journals Silver vacancy concentration engineering leading to the ultralow lattice thermal conductivity and improved thermoelectric performance of Ag1-xInTe2

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yaqiong Zhong ◽  
Yong Luo ◽  
Xie Li ◽  
Jiaolin Cui
Keyword(s):  
Crystal Structure ◽  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Point Defects ◽  
Lattice Thermal Conductivity ◽  
Vacancy Concentration ◽  
Antisite Defect ◽  
Thermoelectric Performance ◽  
Callaway Model

AbstractAgInTe2 compound has not received enough recognition in thermoelectrics, possibly due to the fact that the presence of Te vacancy (VTe) and antisite defect of In at Ag site (InAg) degrades its electrical conductivity. In this work, we prepared the Ag1-xInTe2 compounds with substoichiometric amounts of Ag and observed an ultralow lattice thermal conductivity (κL = 0.1 Wm−1K−1) for the sample at x = 0.15 and 814 K. This leads to more than 2-fold enhancement in the ZT value (ZT = 0.62) compared to the pristine AgInTe2. In addition, we have traced the origin of the untralow κL using the Callaway model. The results attained in this work suggest that the engineering of the silver vacancy (VAg) concentration is still an effective way to manipulate the thermoelectric performance of AgInTe2, realized by the increased point defects and modified crystal structure distortion as the VAg concentration increases.

scholarly journals Synthesis and Crystal Structure of the Bioinorganic Complex [Sb(Hedta)]·2H2O

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Di Li ◽  
Guo-Qing Zhong
Keyword(s):  
Crystal Structure ◽  
Ethylenediaminetetraacetic Acid ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Cell Parameters ◽  
Composition And Structure ◽  
Decomposition Processes ◽  
Distorted Trigonal Bipyramid

The antimony(III) complex [Sb(Hedta)]·2H2O was synthesized with ethylenediaminetetraacetic acid (H4edta) and antimonous oxide as main raw materials in aqueous solution. The composition and structure of the complex were characterized by elemental analysis, infrared spectra, single crystal X-ray diffraction, X-ray powder diffraction, thermogravimetry, and differential scanning calorimetry. The crystal structure of the antimony(III) complex belongs to orthorhombic system, space group Pna2(1), with cell parameters ofa=18.4823(18) Å,b=10.9408(12) Å,c=7.3671(5) Å,V=1489.7(2) Å3,Z=4, andDc=1.993 g cm−3. The Sb(III) ion is five-coordinated by two amido N atoms and three carboxyl O atoms from a single Hedta3−ligand, forming a distorted trigonal bipyramid geometry. The thermal decomposition processes of the complex include dehydration, oxidation, and pyrolysis of the ligand, and the last residue is Sb2O3at the temperature of 570°C.

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