Structure and magnetism of La{sub 4}Mn{sub 5}Si{sub 4}O{sub 22} and La{sub 4}V{sub 5}Si{sub 4}O{sub 22}: Two new rare-earth transition metal sorosilicates
- Institut des Materiaux, Nantes (France)
Two new layered silicates, La{sub 4}Mn{sub 5}Si{sub 4}O{sub 22} and La{sub 4}V{sub 5}Si{sub 4}O{sub 22}, have been prepared and their structures determined. La{sub 4}Mn{sub 5}Si{sub 4}O{sub 22} and La{sub 4}V{sub 5}Si{sub 4}O{sub 22} crystallize in the monoclinic space group C2/m: a = 14.024(2), b = 5.571(2), c = 11.703(2) {angstrom}, {beta} = 114.34(4){degrees} with Z = 2 formula units per cell and a = 13.510(3), b = 5.605(1), c = 11.114(2) {angstrom}, {beta} = 100.45(3){degrees} with Z = 2 formula units per cell, respectively. The structures were determined by single-crystal X-ray diffraction and refined to residuals of R = 2.73% and 3.82%, respectively. The manganese compound crystallizes in the perrierite structure while the vanadium compound crystallizes in the related chevkinite structure. Both perrierite and chevkinite display nearly eclipsed sorosilicate groups which separate rutile-like sheets of edge-shaped transition metal-oxygen octahedra from single, isolated transition metal-oxygen octahedra. Metal-metal distances within the rutile-like sheet are on the order of 2.8 {angstrom} in both compounds, approximately R{sub c}, the critical metal-metal distance defined by Goodenough for appreciable metal-metal interactions and electronic delocalization. Preliminary magnetic data are also presented. 28 refs., 9 figs., 3 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 70274
- Journal Information:
- Chemistry of Materials, Vol. 7, Issue 3; Other Information: PBD: Mar 1995
- Country of Publication:
- United States
- Language:
- English
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