Structural Changes in Macrocycles of Tetrathio-Substituted 1,8-Dioxa-, 1,8-Dithia-3,6,10,13-Tetraazacyclotetradecane and 1,3,5,8,10,12-Hexaazacyclotetradecane upon the Complexation with 3d M(II) Ions according to Density Functional Theory Calculations

2019 ◽  
Vol 64 (4) ◽  
pp. 496-502
Author(s):  
O. V. Mikhailov ◽  
D. V. Chachkov
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Structural Changes ◽  
Density Functional Theory Calculations ◽  
Functional Theory

scholarly journals Density-functional study of pressure-induced phase transitions and electronic properties of Zn2V2O7

RSC Advances ◽  
2021 ◽  
Vol 11 (18) ◽  
pp. 10401-10415
Author(s):  
Daniel Díaz-Anichtchenko ◽  
Lourdes Gracia ◽  
Daniel Errandonea
Keyword(s):  
Density Functional Theory ◽  
Phase Transitions ◽  
Electronic Properties ◽  
Density Functional ◽  
Structural Changes ◽  
Density Functional Theory Calculations ◽  
Functional Study ◽  
Functional Theory ◽  
Density Functional Study

Phase transitions induced by pressure in zinc pyrovanadate have been understood using density-functional theory calculations. Consequences of structural changes on electronic properties are discussed.

Structural investigations on two typical lithium germanate melts by in situ Raman spectroscopy and density functional theory calculations

CrystEngComm ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 701-707
Author(s):  
Songming Wan ◽  
Shujie Zhang ◽  
Xiaoye Gong ◽  
Yu Zeng ◽  
Shengjie Jiang ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Raman Spectroscopy ◽  
Density Functional ◽  
Structural Changes ◽  
Density Functional Theory Calculations ◽  
In Situ Raman Spectroscopy ◽  
Functional Theory ◽  
Structural Investigations ◽  
Melting Temperatures

In situ Raman spectroscopy, together with density functional theory calculations, was used to monitor the structural changes of polycrystalline Li4GeO4 and Li6Ge2O7 from room temperature to their melting temperatures.

scholarly journals Interaction of water with (silico)aluminophosphate zeotypes: a comparative investigation using dispersion-corrected DFT

2016 ◽  
Vol 18 (23) ◽  
pp. 15738-15750 ◽  
Author(s):  
Michael Fischer
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Structural Changes ◽  
Water Adsorption ◽  
Density Functional Theory Calculations ◽  
Comparative Investigation ◽  
Interaction Energies ◽  
Functional Theory ◽  
Adsorption Of Water

The adsorption of water in six structurally different aluminophosphates and their silicoaluminophosphate analogues is investigated using dispersion-corrected density-functional theory calculations. In addition to predicting the interaction energies, the structural changes of the materials upon water adsorption are assessed.

Is a Non-Transition Element Nitride Ferromagnet Ever Achievable? Indication of the N-N Pairing Instability

2006 ◽  
Vol 71 (11-12) ◽  
pp. 1525-1531 ◽  
Author(s):  
Wojciech Grochala
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Transition Element ◽  
Density Functional Theory Calculations ◽  
Functional Theory

The enthalpy of four polymorphs of CaN has been scrutinized at 0 and 100 GPa using density functional theory calculations. It is shown that structures of diamagnetic calcium diazenide (Ca2N2) are preferred over the cubic ferromagnetic polymorph (CaN) postulated before, both at 0 and 100 GPa.

scholarly journals Tensor-structured algorithm for reduced-order scaling large-scale Kohn–Sham density functional theory calculations

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Chih-Chuen Lin ◽  
Phani Motamarri ◽  
Vikram Gavini
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Large Scale ◽  
Density Functional Theory Calculations ◽  
System Size ◽  
Real Space ◽  
Functional Theory ◽  
Reduced Order ◽  
Separable Approximation ◽  
Tensor Basis

AbstractWe present a tensor-structured algorithm for efficient large-scale density functional theory (DFT) calculations by constructing a Tucker tensor basis that is adapted to the Kohn–Sham Hamiltonian and localized in real-space. The proposed approach uses an additive separable approximation to the Kohn–Sham Hamiltonian and an L1 localization technique to generate the 1-D localized functions that constitute the Tucker tensor basis. Numerical results show that the resulting Tucker tensor basis exhibits exponential convergence in the ground-state energy with increasing Tucker rank. Further, the proposed tensor-structured algorithm demonstrated sub-quadratic scaling with system-size for both systems with and without a gap, and involving many thousands of atoms. This reduced-order scaling has also resulted in the proposed approach outperforming plane-wave DFT implementation for systems beyond 2000 electrons.

scholarly journals Polymorphs of Rb3ScF6: X-ray and Neutron Diffraction, Solid-State NMR, and Density Functional Theory Calculations Study

2021 ◽  
Vol 60 (8) ◽  
pp. 6016-6026
Author(s):  
Aydar Rakhmatullin ◽  
Maxim S. Molokeev ◽  
Graham King ◽  
Ilya B. Polovov ◽  
Konstantin V. Maksimtsev ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Solid State ◽  
Neutron Diffraction ◽  
Solid State Nmr ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Functional Theory ◽  
X Ray

scholarly journals Defect Processes in Halogen Doped SnO2

2021 ◽  
Vol 11 (2) ◽  
pp. 551
Author(s):  
Petros-Panagis Filippatos ◽  
Nikolaos Kelaidis ◽  
Maria Vasilopoulou ◽  
Dimitris Davazoglou ◽  
Alexander Chroneos
Keyword(s):  
Electronic Properties ◽  
Tin Oxide ◽  
Density Functional ◽  
Structural Changes ◽  
High Dielectric Constant ◽  
Density Functional Theory Calculations ◽  
Functional Theory ◽  
Optical And Electronic Properties ◽  
High Dielectric ◽  
Gap States

In the present study, we performed density functional theory calculations (DFT) to investigate structural changes and their impact on the electronic properties in halogen (F, Cl, Br, and I) doped tin oxide (SnO2). We performed calculations for atoms intercalated either at interstitial or substitutional positions and then calculated the electronic structure and the optical properties of the doped SnO2. In all cases, a reduction in the bandgap value was evident, while gap states were also formed. Furthermore, when we insert these dopants in interstitial and substitutional positions, they all constitute a single acceptor and donor, respectively. This can also be seen in the density of states through the formation of gap states just above the valence band or below the conduction band, respectively. These gap states may contribute to significant changes in the optical and electronic properties of SnO2, thus affecting the metal oxide’s suitability for photovoltaics and photocatalytic devices. In particular, we found that iodine (I) doping of SnO2 induces a high dielectric constant while also reducing the oxide’s bandgap, making it more efficient for light-harvesting applications.

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