First Principles Study of Topochemical Effects and Electronic Structure Relationships between ANCl and A2N2Se (A = Zr, Ce) Assimilated to Pseudo-Binaries: {AN}Cl and {A2N2}Se
Abstract
:1. Introduction
2. Computational Framework
3. Geometry Optimization and Energy Dependent Results
3.1. Charge Transfer
3.2. Electron Localization Function ELF
4. Electronic Structure and Chemical Bonding
4.1. Electronic Density of States
4.2. Chemical Bonding
5. A2N2Se: Mechanical Properties from the Energy-Volume Equations of States EOS
6. Conclusions
Acknowledgments
Conflicts of Interest
References
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Experimental [3] and (Calculated) Crystal Data of β ZrNCl | Experimental [4] and Calculated Crystal Data of CeNCl | Experimental [8] and (Calculated) Crystal Data of Zr2N2Se | Experimental [6] and (Calculated) Crystal Data of Ce2N2Se | |||||
---|---|---|---|---|---|---|---|---|
Space group | P-3m1 N°164 | P4/nmm N°129 | P63/mmc N°194 | P-3m1 N°164 | ||||
Particular atomic positions | Cr (2a) 0, 0, 0 N1 (2b) ½, 0, 0 | N (2a) 0, 0, 0 | Se (2b) 0, 0, ¼ | Se (2a) 0, 0, 0 | ||||
Lattice parameters | a = 3.604 (3.454) Å c = 9.234 (11.0) Å V(cell) = 103.87 (107.89) Å3 Zr (2c) 0,0,z; z = 0.147 (0.178) N and Cl (2d) 1/3, 2/3, z | a = 4.08 (4.01) Å c = 6.84 (6.93) Å V(cell) = 113.76 (111.76) Å3 Ce and Cl (2c) 0, ½, z | a = 3.6398 (3.822) Å c = 13. 1641 (12.623) Å V(cell) = 151.035 (159.69) Å3 Zr and N (4f) 1/3, 2/3, z | a = 4.0772 (4. 13) Å c = 7.048 (7.30) Å V (cell) = 101.462 (107.89) Å3 Ce and N (2d) 1/3, 2/3, z | ||||
Atoms (2d) | z | Atoms (2c) | z | Atoms (4f) | z | Atoms (2d) | z | |
Atomic coordinates | Cl | 0.332 (0.292) | Ce | 0.166 (0.194) | Zr | 0.9013 (0.9354) | Ce | 0.2847 (0.292) |
N | 0.625 (0.621) | Cl | 0.628 (0.624) | N | 0.0661 (0.066) | N | 0.6256 (0.625) | |
Distances | d(Zr–N) = 2.09 (2.10) Å, d(Zr-Cl) = 2.69 (2.72) Å | d(Ce–N) = 2.17 (2.16)Å, d(Ce-Cl) = 2.89 (3.13) Å | d(Zr–N) = 2.17 (2.18) Å, d(Zr–Se) = 2.89 (2.90)Å | d(Ce–N) = 2.4 (2.43) Å, d(Ce–Se) = 3.09 (3.2) Å |
Binary Oxides | ||||
ZrO2 | CeO2 | |||
QA | +2.55 | +2.425 | ||
QO | −1.275 | −1.212 | ||
±ΔQ | ±2.55 | ±2.425 | ||
Ternary Compounds | ||||
ZrNCl | Zr2N2Se | CeNCl | Ce2N2Se | |
QA | +2.22 | +2.17 | +1.97 | +1.83 |
QN | −1.56 | −1.60 | −1.21 | −1.30 |
QCl | −0.66 | - | -0.76 | - |
QSe | - | −1.14 | - | −1.06 |
±ΔQ | ±2.22 | ±2.17 | ±1.97 | ±1.83 |
±ΔQcmplx | ±0.66 | ±1.14 | ±0.76 | ±1.06 |
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Matar, S.F. First Principles Study of Topochemical Effects and Electronic Structure Relationships between ANCl and A2N2Se (A = Zr, Ce) Assimilated to Pseudo-Binaries: {AN}Cl and {A2N2}Se. Computation 2018, 6, 30. https://doi.org/10.3390/computation6020030
Matar SF. First Principles Study of Topochemical Effects and Electronic Structure Relationships between ANCl and A2N2Se (A = Zr, Ce) Assimilated to Pseudo-Binaries: {AN}Cl and {A2N2}Se. Computation. 2018; 6(2):30. https://doi.org/10.3390/computation6020030
Chicago/Turabian StyleMatar, Samir F. 2018. "First Principles Study of Topochemical Effects and Electronic Structure Relationships between ANCl and A2N2Se (A = Zr, Ce) Assimilated to Pseudo-Binaries: {AN}Cl and {A2N2}Se" Computation 6, no. 2: 30. https://doi.org/10.3390/computation6020030
APA StyleMatar, S. F. (2018). First Principles Study of Topochemical Effects and Electronic Structure Relationships between ANCl and A2N2Se (A = Zr, Ce) Assimilated to Pseudo-Binaries: {AN}Cl and {A2N2}Se. Computation, 6(2), 30. https://doi.org/10.3390/computation6020030