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Title: | The Magnetic Properties of the Systems La͓Y₁₋͓TiO₃, La͓Gd₁₋͓TiO₃, LaTiO₃ and CeTiO₃ |
Authors: | Goral, Paul John |
Advisor: | Greedan, J.E. |
Department: | Chemistry |
Keywords: | Chemistry;Chemistry |
Publication Date: | Dec-1982 |
Abstract: | <p>The magnetic structures of LaTiO₃ and CeTiO₃ were determined by neutron diffraction. LaTiO₃ is a G-type antiferromagnet. The Ti³⁺ sublattice in CeTiO₃ displays G-type and possibly F-type ordering. The Ce³⁺ sublattice exhibits F-type and C-type components.</p> <p>Solid solutions of the form La͓Y₁₋͓TiO₃ and La͓Gd₁₋͓TiO₃ were prepared. Magnetic measurements suggest a weakening of the antiferromagnetic Ti-O-Ti exchange as the Ti-O-Ti bond angle decreases from 157°(LaTiO₃). For sufficiently small bond angle, the Ti-Ti exchange becomes ferromagnetic. Crystal field calculations based on a localized Ti³⁺ 3d¹ electron have reproduced the general features of susceptibility data reported for La͓Y₁₋͓TiO₃ (x=0,.1,.2,.4,.7). This is in agreement with resistivity measurements undertaken on La.₁.₉TiO₃ and La.₂Y.₈TiO₃ which are characteristic of an activated transport mechanism.</p> |
URI: | http://hdl.handle.net/11375/6187 |
Identifier: | opendissertations/1516 2177 1263605 |
Appears in Collections: | Open Access Dissertations and Theses |
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fulltext.pdf | 2.46 MB | Adobe PDF | View/Open |
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