Stabilized cubic phase BiAgSe2−xSx with excellent thermoelectric properties via phase boundary engineering

2021 ◽  
Author(s):  
Yao Hu ◽  
Song Yuan ◽  
Haojie Huo ◽  
Juanjuan Xing ◽  
Kai Guo ◽  
...  
Keyword(s):  
Phase Separation ◽  
Phase Boundary ◽  
Thermoelectric Properties ◽  
Chemical Bonding ◽  
Internal Strain ◽  
Cubic Phase

Whilst maintaining promising thermoelectric properties, phase separation and internal strain were significantly suppressed in cubic BiAgSe2−xSxvia phase boundary engineering, as a result of the strengthened chemical bonding.

Phase separation and thermoelectric properties of Ag2Te-doped PbTe0.9S0.1

2012 ◽  
Vol 60 (20) ◽  
pp. 7241-7248 ◽  
Author(s):  
He Zhang ◽  
Jun Luo ◽  
Hang-Tian Zhu ◽  
Jing-Kui Liang ◽  
Li-Min Ruan ◽  
...  
Keyword(s):  
Phase Separation ◽  
Thermoelectric Properties

Role of the internal strain on the incomplete Si∕SiO2 phase separation in substoichiometric silicon oxide films

2007 ◽  
Vol 90 (18) ◽  
pp. 183101 ◽  
Author(s):  
A. La Magna ◽  
G. Nicotra ◽  
C. Bongiorno ◽  
C. Spinella ◽  
M. G. Grimaldi ◽  
...  
Keyword(s):  
Phase Separation ◽  
Silicon Oxide ◽  
Oxide Films ◽  
Internal Strain ◽  
Sio2 Phase

Piezoelectric properties of lead-free (Na0.5Bi0.5)TiO3–(Na0.5K0.5)NbO3–BaTiO3 ceramics

2008 ◽  
Vol 23 (1) ◽  
pp. 115-120 ◽  
Author(s):  
Seung-Ho Lee ◽  
Chang-Bun Yoon ◽  
Sung-Mi Lee ◽  
Hyoun-Ee Kim ◽  
Kyung-Woo Lee
Keyword(s):  
Crystal Structure ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Microstructural Evolution ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
Cubic Phase ◽  
Lead Free Ceramics ◽  
Wide Range

The microstructural evolution and piezoelectric properties of lead-free ceramics (0.98-x)(Na0.5Bi0.5)TiO3–x(Na0.5K0.5)NbO3–0.02BaTiO3 (0 ⩽ x ⩽ 0.98, abbreviated as (0.98-x)NBT–xNKN–0.02BT) were investigated. The effects of the amount of NKN on the crystal structure, microstructural evolution, and piezoelectric properties were examined. The 0.93NBT–0.05NKN–0.02BT ceramics having a lower NKN content gave good performances with piezoelectric properties of d33 = 140 pC/N and kp = 21%, because of the soft additive Nb5+ ions at the B sites. However, a paraelectric cubic phase was observed in the wide range of compositions between x = 0.1 and x = 0.9. At a higher NKN content of x > 0.9, a morphotropic phase boundary (MPB) between the tetragonal and orthorhombic phases was found in the 0.015NBT–0.965NKN–0.02BT ceramics, and the piezoelectric properties were enhanced (d33 = 135 pC/N, kp = 29%). The piezoelectric properties of this system were closely related to its crystal structure.

scholarly journals Stochastic dynamics of single molecules across phase boundaries

2021 ◽  
Author(s):  
Stefano Bo ◽  
Lars Hubatsch ◽  
Jonathan Bauermann ◽  
Christoph A. Weber ◽  
Frank Julicher
Keyword(s):  
Phase Separation ◽  
Phase Boundary ◽  
Single Molecule ◽  
Concentration Gradient ◽  
Detailed Balance ◽  
Single Molecules ◽  
Thermal Fluctuations ◽  
Phase Boundaries ◽  
Single Molecule Dynamics ◽  
Molecule Dynamics

We discuss the stochastic trajectories of single molecules in a phase-separated liquid, when a dense and a dilute phase coexist. Starting from a continuum theory of macroscopic phase separation we derive a stochastic Langevin equation for molecular trajectories that takes into account thermal fluctuations. We find that molecular trajectories can be described as diffusion with drift in an effective potential, which has a steep gradient at phase boundaries. We discuss how the physics of phase coexistence affects the statistics of molecular trajectories and in particular the statistics of displacements of molecules crossing a phase boundary. At thermodynamic equilibrium detailed balance imposes that the distributions of displacements crossing the phase boundary from the dense or from the dilute phase are the same. Our theory can be used to infer key phase separation parameters from the statistics of single-molecule trajectories. For simple Brownian motion, there is no drift in the presence of a concentration gradient. We show that interactions in the fluid give rise to an average drift velocity in concentration gradients. Interestingly, under non-equilibrium conditions, single molecules tend to drift uphill the concentration gradient. Thus, our work bridges between single-molecule dynamics and collective dynamics at macroscopic scales and provides a framework to study single-molecule dynamics in phase-separating systems.

The unusual chemical bonding and thermoelectric properties of a new type Zintl phase compounds Ba3Al2As4

2016 ◽  
Vol 237-238 ◽  
pp. 28-33 ◽  
Author(s):  
Gui Yang ◽  
Guangbiao Zhang ◽  
Chao Wang ◽  
Yuanxu Wang
Keyword(s):  
Thermoelectric Properties ◽  
Chemical Bonding ◽  
Zintl Phase ◽  
New Type

Effect of annealing temperature on the phase transition, band gap and thermoelectric properties of Cu2SnSe3

2018 ◽  
Vol 6 (7) ◽  
pp. 1780-1788 ◽  
Author(s):  
Muhammad Siyar ◽  
Jun-Young Cho ◽  
Yong Youn ◽  
Seungwu Han ◽  
Miyoung Kim ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
Band Gap ◽  
Thermoelectric Properties ◽  
Monoclinic Phase ◽  
Annealing Temperature ◽  
Cubic Phase ◽  
Transition Band ◽  
Two Phases ◽  
Thermal Conductivities

The electrical conductivity of the cubic phase, which is larger than that of the monoclinic phase, and similar thermal conductivities of the two phases lead to the higher ZT of the cubic Cu2SnSe3.

Sign in / Sign up

Export Citation Format

Share Document