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ysu1219951849.pdf (884.75 KB)
ETD Abstract Container
Abstract Header
Studies of Mixed-Anion Manganites and Other Compounds
Author Info
Dasu, Anita
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=ysu1219951849
Abstract Details
Year and Degree
2008, Master of Science in Chemistry, Youngstown State University, Department of Chemistry.
Abstract
Relative to oxides, mixed anion materials containing N and/or F dissolved within an oxide lattice offer a variety of advantages, including smaller band gaps and incorporating a greater variety of potential cations with a larger possible range of oxidation states. These factors, coupled with the relatively lowered symmetry that may occur due to anion ordering suggest enhanced dielectric, magnetic, and/or optical properties for the targeted materials. The goal of this project is to synthesize a mixed-anion analog of (Ca, La)MnO
3
, which is well known for colossal magnetoresistive properties due in part to the presence of both Mn
3+
and Mn
4+
in the lattice. Such materials may have potential applications in magnetic storage devices (e.g. computer hard drives). Whereas the presence of mixed Mn
3+/4+
ions results from substituting La
3+
for some Ca
2+
in the oxide lattice, the same effect can hypothetically be achieved through anion substitutions such as N
3-
and/or F
-
for O
2-
. Attempts were made in this study to directly synthesize novel CaMnN
x
O
y
F
z
materials from binary Mn and Ca compounds, or from redox reactions in N
2
, but they were unsuccessful. These attempts will be summarized and a new approach involving ammonolysis of CaMnO
3
, followed by fluorination of the product to give the novel compound Ca
2
(Mn
3+
, Mn
4+
)O
5
F, will be discussed. A second project will also be discussed involving crystal chemical studies of Sr
2
BiGa
11
O
20
. The single crystal X-ray structure of the compound, which is found to be isostructural with Ba
2
BiGa
11
O
20
, is presented for the first time. The structure will also be discussed in the context of a bond-valence sum analysis.
Committee
Timothy Wagner, PhD (Advisor)
Sherri Lovelace-Cameron, PhD (Committee Member)
Brian Leskiw, PhD (Committee Member)
Pages
47 p.
Subject Headings
Chemistry
;
Materials Science
Keywords
manganites
;
perovskites
;
colossal magnetoresistance
Recommended Citations
Refworks
EndNote
RIS
Mendeley
Citations
Dasu, A. (2008).
Studies of Mixed-Anion Manganites and Other Compounds
[Master's thesis, Youngstown State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1219951849
APA Style (7th edition)
Dasu, Anita.
Studies of Mixed-Anion Manganites and Other Compounds.
2008. Youngstown State University, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=ysu1219951849.
MLA Style (8th edition)
Dasu, Anita. "Studies of Mixed-Anion Manganites and Other Compounds." Master's thesis, Youngstown State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1219951849
Chicago Manual of Style (17th edition)
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Document number:
ysu1219951849
Download Count:
1,469
Copyright Info
© 2008, all rights reserved.
This open access ETD is published by Youngstown State University and OhioLINK.