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http://hdl.handle.net/11375/19205| Title: | A Magnetic Structural Study of Tb2Mo2O7, Sr2CrO3F and SrLaCrO4 |
| Authors: | Penny, Sarah |
| Advisor: | Greedan, J. E. |
| Department: | Chemistry |
| Keywords: | magnetic structure;Magnetic susceptibility;ferromagnetic;antiferromagnetic |
| Publication Date: | Sep-1990 |
| Abstract: | <p> Magnetic susceptibility data indicate that Tb2Mo2O7 undergoes a spin glass transition at 25 K. The crystal structure is consistent with the fully ordered pyrochlore model. Short range order, involving ferromagnetic and antiferromagnetic correlations, is observed down to 8 K by neutron scattering. </p> <p> Sr2Cr03F and SrLaCr04 have the same magnetic structure. The neutron diffraction data are consistent with two different models. In both cases the magnetic cell is √2a and c and the magnetic moments lie out of the plane. However, in one model the in-plane projection is canted and in the other it is colinear. Sr2Cr03F has a Tc value of 132(2) K and a susceptibility maximum at 280 K. SrLaCr04 has a Tc value of approximately 200 K and a susceptibility maximum near 400 K. The critical· exponent β for Sr2Cr03F is 0.26(4). The (100) magnetic reflection of both SrLaCr04 and Sr2Cr03F shows short range order correlations above Tc. </p> |
| URI: | http://hdl.handle.net/11375/19205 |
| Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Penny_Sarah_1990_Masters.pdf | 18.76 MB | Adobe PDF | View/Open |
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