Sr{sub 4+n}Mn{super III}{sub 4}Mn{super IV}{sub n} O{sub 10+3n} : A new homologous series of oxygen vacancy-ordered perovskite compounds built from Mn{sup III}-O pyramids and Mn{sup IV}-O octahedra.
A new homologous series of oxygen-vacancy-ordered perovskites with the formula Sr{sub 4+n}Mn{sub 4}{sup 3+}Mn{sub n}{sup 4+}O{sub 10+3n} is proposed based on the structural trends found for the recently described Sr{sub 4}Mn{sub 4}O{sub 10}, Sr{sub 5}Mn{sub 5}O{sub 13} and Sr{sub 7}Mn{sub 7}O{sub 19} compounds. These compounds correspond to n = 0 (Sr{sub 4}Mn{sub 4}{sup 3+}O{sub 10}), n = 1 (Sr{sub 5}Mn{sub 4}{sup 3+}Mn{sup 4+}O{sub 13}) and n = 3 (Sr{sub 7}Mn{sub 4}{sup 3+}Mn{sub 3}{sup 4+}O{sub 19}) members of the series. A linear set of four Mn{sup 3+}O{sub 5} pyramids placed on the ab plane and pointing along the +x, -y, +y, -x directions defines the n = 0 building block for the series. The nth members can be constructed from blocks containing four pyramids and n Mn{sup 4+}O{sub 6} octahedra with 2/m symmetry. Compounds in the related systems CaMnO{sub x} and LaCuO{sub x}, containing Mn{sup 3+} and Cu{sup 2+} pyramids and Mn{sup 4+} and Cu{sup 3+} octahedra have also been found to be members of the series. The size and charge of the A-site cation and the apical distortion of the pyramidally coordinated B-site cation are shown to be important factors in the stabilization of certain members of the series. A qualitative explanation for the absence of some of the possible members of the series is presented based on these factors.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); DOT
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 992042
- Report Number(s):
- ANL/MSD/JA-59703; TRN: US201021%%372
- Journal Information:
- Acta Crystallogr. B, Vol. 64, Issue 2 ; 2008
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
U(IV)/Ln(III) mixed site in polymetallic oxalato complexes. Part III: Structure of Na[Yb(C{sub 2}O{sub 4}){sub 2}(H{sub 2}O)].3H{sub 2}O and the derived quadratic series (NH{sub 4}{sup +}){sub 1-x}[Ln{sub 1-x}U{sub x} (C{sub 2}O{sub 4}){sub 2}(H{sub 2}O)].(3+x) H{sub 2}O, Ln=Y, Pr-Sm, Gd, Tb
(Mn{sub 1-x}Pb{sub x})Pb{sub 10+y}Sb{sub 12-y}S{sub 26-y}Cl{sub 4+y}O, a new oxy-chloro-sulfide with {approx}2 nm-spaced (Mn,Pb)Cl{sub 4} single chains within a waffle-type crystal structure