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ANSTO Publications Online >
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Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/3206
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| 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, ZM 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. M., 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. |
| 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 |
| 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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