Structure evolution mechanism of Na0.5Bi2.5Nb2−xWxO9+δ ferroelectric ceramics: Temperature-dependent optical evidence and first-principles calculations

2017 ◽  
Vol 96 (2) ◽  
Author(s):  
Qianqian Li ◽  
Junyong Wang ◽  
Mengjiao Li ◽  
Shuang Guo ◽  
Jinzhong Zhang ◽  
...  
Keyword(s):  
First Principles ◽  
Ferroelectric Ceramics ◽  
Structure Evolution ◽  
First Principles Calculations ◽  
Temperature Dependent ◽  
Evolution Mechanism ◽  
Optical Evidence

Enhanced exciton emission behavior and tunable band gap of ternary W(SxSe1−x)2 monolayer: temperature dependent optical evidence and first-principles calculations

Nanoscale ◽  
2018 ◽  
Vol 10 (24) ◽  
pp. 11553-11563 ◽  
Author(s):  
Huimin Sun ◽  
Junyong Wang ◽  
Fang Wang ◽  
Liping Xu ◽  
Kai Jiang ◽  
...  
Keyword(s):  
Band Gap ◽  
Sulfur Content ◽  
First Principles ◽  
First Principles Calculations ◽  
Temperature Dependent ◽  
Exciton Emission ◽  
Cvd Method ◽  
Emission Behavior ◽  
Optical Evidence ◽  
Tunable Band Gap

We report enhanced exciton emission behavior of W(SxSe1−x)2 monolayers with changing the sulfur content derived by the CVD method.

scholarly journals The thermal stability of FAPbBr3 nanocrystals from temperature-dependent photoluminescence and first-principles calculations

RSC Advances ◽  
2020 ◽  
Vol 10 (72) ◽  
pp. 44373-44381
Author(s):  
Xiaozhe Wang ◽  
Qi Wang ◽  
Zhijun Chai ◽  
Wenzhi Wu
Keyword(s):  
First Principles ◽  
First Principle ◽  
First Principles Calculations ◽  
Temperature Dependent ◽  
Time Resolved ◽  
First Principle Calculations ◽  
Steady State Time ◽  
Time Resolved Photoluminescence ◽  
Thermal Stability Of ◽  
Temperature Dependent Photoluminescence

The thermal properties of FAPbBr3 perovskite nanocrystals (PNCs) is investigated by use of temperature-dependent steady-state/time-resolved photoluminescence and first-principle calculations.

Spin-manipulated phonon dynamics during magnetic phase transitions in triangular lattice antiferromagnet CuCr1−xMgxO2 semiconductor films

RSC Advances ◽  
2016 ◽  
Vol 6 (32) ◽  
pp. 27136-27142 ◽  
Author(s):  
Xurui Li ◽  
Junyong Wang ◽  
Jinzhong Zhang ◽  
Yawei Li ◽  
Zhigao Hu ◽  
...  
Keyword(s):  
Phase Transitions ◽  
First Principles ◽  
Magnetic Phase ◽  
Magnetic Phase Transitions ◽  
First Principles Calculations ◽  
Semiconductor Films ◽  
Temperature Dependent ◽  
Phonon Spectra ◽  
Phonon Dynamics ◽  
Triangular Lattice Antiferromagnet

The temperature-dependent phonon spectra and magnetoresistance of CuCr1−xMgxO2 films have been studied, combined with first-principles calculations.

Characterisation of the temperature-dependent M1 to R phase transition in W-doped VO2 nanorod aggregates by Rietveld refinement and theoretical modelling

2020 ◽  
Vol 22 (15) ◽  
pp. 7984-7994
Author(s):  
Lei Miao ◽  
Ying Peng ◽  
Dianhui Wang ◽  
Jihui Liang ◽  
Chaohao Hu ◽  
...  
Keyword(s):  
Rietveld Refinement ◽  
First Principles ◽  
Atomic Scale ◽  
Theoretical Modelling ◽  
First Principles Calculations ◽  
Temperature Dependent ◽  
Macro Scale ◽  
Scale Properties ◽  
W Doping ◽  
Synchrotron Xrd

Synchrotron XRD Rietveld refinement is combined with first-principles calculations to probe the effect of W doping on the IMT mechanism in VO2 nanorods, providing insights into the connection between atomic-scale phenomena and macro-scale properties.

scholarly journals Origin of the Giant Negative Thermal Expansion inMn3(Cu0.5Ge0.5)N

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
B. Y. Qu ◽  
H. Y. He ◽  
B. C. Pan
Keyword(s):  
Phase Transition ◽  
Thermal Expansion ◽  
Magnetic Phase Transition ◽  
First Principles ◽  
Magnetic Phase ◽  
Lattice Vibration ◽  
Negative Thermal Expansion ◽  
First Principles Calculations ◽  
Temperature Dependent ◽  
Thermal Expansion Property

The giant negative thermal expansion in the Ge-doped antiperovskite Mn3CuN compound is theoretically studied by using the first principles calculations. We propose that such a negative thermal expansion property is essentially attributed to the magnetic phase transition, rather than to the lattice vibration of the Ge-doped compound. Furthermore, we found that the doped Ge atoms in the compound significantly enhance the antiferromagnetic couplings between the nearest neighboring Mn ions, which effectively stabilizes the magnetic ground states. In addition, the nature of the temperature-dependent changes in the volume of the Ge-doped compound was revealed.

scholarly journals The Evaluation of Mg-Ga Compounds as Electrode Materials for Mg-Ion Batteries via Ab Initio Simulation

2021 ◽  
Author(s):  
Chao Song ◽  
Yuan Yuan ◽  
Dachong Gu ◽  
Tao Chen ◽  
Yuping Liu ◽  
...  
Keyword(s):  
First Principles ◽  
Anode Materials ◽  
Electrode Materials ◽  
High Capacity ◽  
Structure Evolution ◽  
Kinetic Properties ◽  
First Principles Calculations ◽  
Alloy Type ◽  
Magnesium Ion Batteries ◽  
Fast Ion

Abstract The Mg-Ga alloy-type electrode is one of the potential anode materials for Magnesium-ion batteries (MIBs). In this work, the thermodynamic, electrochemical and kinetic properties of Mg-Ga compounds, i.e. Mg2Ga5, MgGa2, MgGa, Mg2Ga and Mg5Ga2, have been systematically studied. Combining the first-principles calculations and charge-discharge experimental results, the structure evolution and voltage curves of Mg-Ga compounds are presented, where the Mg-Ga compounds show low voltages and high capacity up to 1922 mAh·g-1 with Mg5Ga2. Additionally, the diffusion barriers of Mg in Mg-Ga alloys are low, which is favorable for the fast ion-transmission and then good rate performance as anodes of MIBs.

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