A Magnetic Structural Study of Tb2Mo2O7, Sr2CrO3F and SrLaCrO4
| dc.contributor.advisor | Greedan, J. E. | |
| dc.contributor.author | Penny, Sarah | |
| dc.contributor.department | Chemistry | en_US |
| dc.date.accessioned | 2016-05-04T17:10:08Z | |
| dc.date.available | 2016-05-04T17:10:08Z | |
| dc.date.issued | 1990-09 | |
| dc.description.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> | en_US |
| dc.description.degree | Master of Science (MSc) | en_US |
| dc.description.degreetype | Thesis | en_US |
| dc.identifier.uri | http://hdl.handle.net/11375/19205 | |
| dc.language.iso | en | en_US |
| dc.subject | magnetic structure | en_US |
| dc.subject | Magnetic susceptibility | en_US |
| dc.subject | ferromagnetic | en_US |
| dc.subject | antiferromagnetic | en_US |
| dc.title | A Magnetic Structural Study of Tb2Mo2O7, Sr2CrO3F and SrLaCrO4 | en_US |