Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/3206
Title: Synthesis and structural studies of the transition-metal-doped Rh perovskites LaMn0.5Rh0.5O3 and LaCu0.5Rh0.5O3.
Authors: Ting, J
Kennedy, BJ
Zhang, Z
Avdeev, M
Johannessen, B
Jang, LY
Keywords: Perovskites
Rhodium
Absorption
Doped materials
Jahn-Teller effect
X-ray diffraction
Issue Date: 9-Mar-2010
Publisher: American Chemical Society
Citation: Ting, J., Kennedy, B. J., Zhang, Z., Avdeev, M., Johannessen, B., & Jang, L. Y. (2010). Synthesis and structural studies of the transition-metal-doped Rh perovskites LaMn0.5Rh0.5O3 and LaCu0.5Rh0.5O3. Chemistry of Materials, 22(5), 1640-1646. doi:10.1021/cm902718r
Abstract: The two orthorhombic perovskites LaMn0.5Rh0.5O3 and LaCu0.5Rh0.5O3 have been characterized using X-ray absorption near edge structure (XANES) measurements and powder synchrotron X-ray and neutron diffraction. The Mn and Rh in LaMn0.5Rh0.5O3 are essentially trivalent and disordered onto the same crystallographic site. The absence of an appreciable Jahn−Teller (JT) distortion of the BO6 octahedra is a consequence of this disorder and large magnitude of the octahedral tilting. XANES measurements show that the Rh in LaCu0.5Rh0.5O3 has a valence state of around +3.5 as a consequence of extensive charge delocalization between the Cu and Rh cations, that are also disordered onto a single site. These two effects combine to further reduce the distortion of the octahedra in LaCu0.5Rh0.5O3 relative to that of LaMn0.5Rh0.5O3. © 2010, American Chemical Society
Gov't Doc #: 1619
URI: http://dx.doi.org/10.1021/cm902718r
http://apo.ansto.gov.au/dspace/handle/10238/3206
ISSN: 0897-4756
Appears in Collections:Journal Articles

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