%0 Journal Article %1 WOS:000245288500023 %A Henriques, J M %A Caetano, E W S %A Freire, V N %A da Costa, J A P %A Albuquerque, E L %C 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA %D 2007 %I ACADEMIC PRESS INC ELSEVIER SCIENCE %J JOURNAL OF SOLID STATE CHEMISTRY %K CaGeO3; absorption; band dielectric effective function} masses; optical properties; structural structure; {orthorhombic %N 3 %P 974-980 %R 10.1016/j.jssc.2006.12.029 %T Ab initio structural, electronic and optical properties of orthorhombic CaGeO3 %V 180 %X Orthorhombic CaGeO3 is studied using density-functional theory (DFT) considering both the local density and generalized gradient approximations, LDA and GGA, respectively. The electronic band structure, density of states, dielectric function and optical absorption are calculated. Two very close indirect (S -> Gamma) and direct (Gamma -> Gamma) band gap energies of 1.68 eV (2.31 eV) and 1.75 eV (2.41 eV) were obtained within the GGA (LDA) approximation, as well as the effective masses for electrons and holes. Comparing with orthorhombic CaCO3 (aragonite), the substitution of carbon by germanium changes the localization of the valence band maximum of the indirect transition, and decreases by almost 2.0 eV the Kohn-Sham band gap energies. (c) 2007 Elsevier Inc. All rights reserved.

@article{WOS:000245288500023, abstract = {Orthorhombic CaGeO3 is studied using density-functional theory (DFT) considering both the local density and generalized gradient approximations, LDA and GGA, respectively. The electronic band structure, density of states, dielectric function and optical absorption are calculated. Two very close indirect (S -> Gamma) and direct (Gamma -> Gamma) band gap energies of 1.68 eV (2.31 eV) and 1.75 eV (2.41 eV) were obtained within the GGA (LDA) approximation, as well as the effective masses for electrons and holes. Comparing with orthorhombic CaCO3 (aragonite), the substitution of carbon by germanium changes the localization of the valence band maximum of the indirect transition, and decreases by almost 2.0 eV the Kohn-Sham band gap energies. (c) 2007 Elsevier Inc. All rights reserved.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA}, author = {Henriques, J M and Caetano, E W S and Freire, V N and da Costa, J A P and Albuquerque, E L}, biburl = {https://www.bibsonomy.org/bibtex/26f20cd00ccbce4f95e0551617e06546a/ppgfis_ufc_br}, doi = {10.1016/j.jssc.2006.12.029}, interhash = {f5e51de422eb8dff225ff7609af2206c}, intrahash = {6f20cd00ccbce4f95e0551617e06546a}, issn = {0022-4596}, journal = {JOURNAL OF SOLID STATE CHEMISTRY}, keywords = {CaGeO3; absorption; band dielectric effective function} masses; optical properties; structural structure; {orthorhombic}, number = 3, pages = {974-980}, publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Ab initio structural, electronic and optical properties of orthorhombic CaGeO3}, tppubtype = {article}, volume = 180, year = 2007 }