A novel complex transition metal oxide AgCu 3 Cr 4 O 12 has been obtained using high-pressure and high-temperature conditions of 12 GPa and 1223 K. The crystal structure is refined to be a cubic AAA 3 B 4 O 12 -type quadruple perovskite structure based on the Rietveld refinement of the synchrotron X-ray powder diffraction data. The density-functional theory calculation obtains a metallic band structure. The valence state is estimated to be Ag ³1.3+ Cu ³2.2+ 3 Cr 4+ 4 O 12 by bond valence sum and X-ray absorption spectroscopy analyses. The valence state on ACu 3 Cr 4 O 12 series (A = Ag, Ca, La, Ce) sequentially transforms from Ag ³1.3+ Cu ³2.2+ 3 Cr 4+ 4 O 12 , Ca 2+ Cu 2+ 3 Cr 4+ 4 O 12 , La 3+ Cu (2+¤)+ 3 Cr (3.75¹0.75¤)+ 4 O 12 , to Ce 4+ Cu 2+ 3 Cr 3.5+ 4 O 12, where the electrons are doped into the AA-site (Cu ³2.2+ ¼ Cu 2+ ), followed by predominant doping into the B-site (Cr 4+ ¼ Cr (3.75¹0.75¤)+ ¼ Cr 3.5+ ). Their electron doping sequence is distinguished from those reported in other quadruple perovskite oxides, proposing characteristic features of the ACu 3 Cr 4 O 12 family.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.