dc.contributor.advisor | Hughbanks, Timothy R | |
dc.creator | Chen, Chun-Yu | |
dc.date.accessioned | 2015-01-09T20:25:39Z | |
dc.date.available | 2016-05-01T05:31:03Z | |
dc.date.created | 2014-05 | |
dc.date.issued | 2014-04-28 | |
dc.date.submitted | May 2014 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/152575 | |
dc.description.abstract | Reduced rare-earth (Ln, lanthanide elements) compounds with low-dimensional Ln-Ln-bonded structures are promising candidates for magnetic materials because Ln-Ln-bonded molecules and solids have delocalized 5d electrons that make strong magnetic coupling possible. Four new rare-earth compounds were synthesized in this work, I. Gd_(9)Br_(16)O_(4), II. Gd_(6)Br_(7)Si_(2), III. Pr_(3)Si and IV. Pr_(2)I_(2)Ge. The first two gadolinium bromide compounds exhibit 1-dimensional Ln-Ln-bonded motifs imbedded within layered structures. Pr_(3)Si is a new binary phase with a structure that can be more easily visualized by focusing on the interpenetrating (10, 3)-a silicon network. Pr_(2)I_(2)Ge has a double-layered structure. The results of EHTB band structure calculations indicate that the bottom the Gd_(9)Br_(16)O_(4) d bands and those of a hypothetical analogous yttrium compound (Y_(9)Br_(16)O_(4)) are half filled; the Fermi levels of those two compounds cut through two d bands. Gd_(6)Br_(7)Si_(2) and Pr_(3)Si are predicted to be metallic, as expected. The results of magnetic measurements on Gd_(6)Br_(7)Si_(2) show that it behaves like a soft magnet at 2 K and undergoes phase transitions at 27 K and 70 K. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | en | |
dc.subject | Lanthanide elements | en |
dc.subject | Rare-Earth Compounds | en |
dc.subject | Gadolinium | en |
dc.title | Synthesis, Computations and Characterizations of Low Dimensional Rare-Earth Compounds | en |
dc.type | Thesis | en |
thesis.degree.department | Chemistry | en |
thesis.degree.discipline | Chemistry | en |
thesis.degree.grantor | Texas A & M University | en |
thesis.degree.name | Doctor of Philosophy | en |
thesis.degree.level | Doctoral | en |
dc.contributor.committeeMember | Darensbourg, Marcetta Y | |
dc.contributor.committeeMember | Gabbaï, François P | |
dc.contributor.committeeMember | Teizer, Winfried | |
dc.type.material | text | en |
dc.date.updated | 2015-01-09T20:25:39Z | |
local.embargo.terms | 2016-05-01 | |
local.etdauthor.orcid | 0000-0002-6657-5240 | |