Please use this identifier to cite or link to this item:
http://hdl.handle.net/11375/8663
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Calvo, C. | en_US |
dc.contributor.advisor | Ng, H.N. | en_US |
dc.contributor.author | Idler, Loralee Kathleen | en_US |
dc.date.accessioned | 2014-06-18T16:43:36Z | - |
dc.date.available | 2014-06-18T16:43:36Z | - |
dc.date.created | 2009-06-30 | en_US |
dc.date.issued | 1977-09 | en_US |
dc.identifier.other | opendissertations/385 | en_US |
dc.identifier.other | 1229 | en_US |
dc.identifier.other | 885160 | en_US |
dc.identifier.uri | http://hdl.handle.net/11375/8663 | - |
dc.description.abstract | <p>Cation substitution studies in several vanadate-phosphate systems have revealed substantial substitution between pentavalent V and P in tetrahedral sites in both ring and chain structures. The phase Zn₃V₀․₅P₁․₅O₈ has been prepared and its structure has been determined and found to be similar to that of α-Zn₃(PO₄)₂. It crystalizes in the space group C2/c with rings of Zn(1)O₄ and (V,P)O₄ tetrahedra sharing corners to form chains, which are linked to neighbouring chains by Zn(2)O₄ tetrahedra. The edge-sharing between Zn tetrahedra which is found in α-Zn₃(PO₄)₂ is absent in Zn₃V₀․₅P₁․₅O₈. There is no evidence of long-range ordering of V⁵⁺ and P⁵⁺ cations in this structure.</p> <p>Three pyroxene-like phases, related to NaVO₃ and characterized by tetrahedral chains, have been prepared. The NaV⅔P⅓O₃ structure closely resembles that of NaVO₃, and shows no long-range ordering of V⁵⁺ and P⁵⁺. The mixed phases Na․₈₇₅K․₁₂₅VO₃ and Na₀․₅K₀․₅VO₃ were prepared in order to study the effects of M⁺ substitution on the NaVO₃ structure. The structure of Na․₈₇₅K․₁₂₅VO₃ resembles that of NaVO₃ and NaV⅔P⅓O₃, while Na₀․₅K₀․₅VO₃ has the true diopside structure, with Na and K ordered in two nonequivalent sites. All three structures were refined in the space group C2/c and the effects of cation substitution on the configuration of the tetrahedral chains are discussed.</p> | en_US |
dc.subject | Chemistry | en_US |
dc.subject | Chemistry | en_US |
dc.title | Cation Substitution Studies in Some Vanadate-Phosphate Systems | en_US |
dc.type | thesis | en_US |
dc.contributor.department | Chemistry | en_US |
dc.description.degree | Master of Science (MS) | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Size | Format | |
---|---|---|---|
fulltext.pdf | 2.79 MB | Adobe PDF | View/Open |
Items in MacSphere are protected by copyright, with all rights reserved, unless otherwise indicated.