Thesis--Wisconsin. / Vita. Includes bibliographical references (leaves 147-150).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1956. / Typescript. Abstracted in Dissertation abstracts, v. 16 (1956) no. 11, p. 2042. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 64-65).

Thesis (M.S.)--Oregon State University, 2007. / Printout. Includes bibliographical references (leaves 109-114). Also available on the World Wide Web.

Thesis (Ph. D.)Oregon Graduate Center, 1986.

No description available.

A study has been made of the system BaO - A1203 - H20 under varying conditions (temperature, pressure and time) using different starting materials. Of the nine previously reported barium a luminate hydrates, eight (B 1.1AH,* α-BAH2, α-BAH 4' β-BAH4, B1.1AH6, BAH7 , B2AH5 and B3AH7) have been confirmed, and one (Thilo's β-BAH2) was not confirmed. In addition, eight new binary or ternary compounds have been obtained, viz: Y-BAH 2, BAHO.5, B2AH2, B2AH, B3AH6, β-B3A, BxAγHz and BxA. The formula of the last two compounds are uncertain. Besides these, the existence of B2A, which has been questioned by many investigators, has been confirmed. Lattice constants and other crystallographic data have been determined for most of the above compounds, mainly by single crystal X-ray methods or in two cases by selected area electron diffraction. The compounds have also been studied in the following ways: (1) X-ray powder diffraction, (2) infrared spectroscopy, (3) differential thermal analysis, (4) thermogravimetric analysis, (5) static thermal analysis, (6) optical microscopy, (7) chemical analysis and (8) determination of density. The results of these studies are reported. The detailed structure analyses of B3AH6, B2AH5 and α-BAH2 have been performed by X-ray methods. The results show that B3AH6 has the hydrogarnet structure, B2AH5 contains isolated polynuclear anions of formula A12(OH)4-10 formed by sharing edges of centrosymmetrically related Al(OH)6 octahedra, and α-BAH2 is built from isolated helical chains formed from A104 tetrahedra. (*Cement chemical abbreviations: B = BaO, A = Al203, H = H20).

The absorption of polarized infrared radiation by single crystals of barium formate has been recorded between 4000 and 500 cm⁻¹. Factor group splitting has been observed for molecular modes and for some of the overtones and combinations. Lattice mode frequencies are inferred from combinations with molecular modes. The infrared spectrum of polycrystalline lead and sodium formate, and of aqueous barium formate has been similarly recorded and compared with that of crystalline barium formate. The nuclear magnetic resonance spectrum of barium formate has been recorded, and a discrepancy between the theoretical and experimental second moment indicates that a previously proposed crystal structure is incorrect. However, an X-ray and infrared study of a single crystal confirm that the factor group of barium formate is P2₁2₁2₁ and that there is no degradation of the crystal symmetry due to a possible distortion of the C-H bond of the formate ion. It is concluded that the coordinates of the carbon and oxygen atoms are incorrect in the original crystal structure determination. The nuclear magnetic resonance spectrum of lead formate also indicates that the crystal structure of this compound is in error, but no attempt is made to elucidate the correct structure. / Science, Faculty of / Chemistry, Department of / Graduate

A study of rare barium minerals from the Yukon Territory has resulted in the discovery of at least one and possibly five new species. The present investigation is concerned with one of these, a barium-calcium-iron-alumino-silicate, which is tentatively classed as an inosilicate and named keeleite. The optical and physical properties, a chemical analysis, and the calculation of its formula are presented. The mineral has also been successfully synthesized. An X-ray study of some supergene and alteration products present in the rocks revealed the presence of an interesting mixture of barium-calcium carbonate salts, similar to those obtained as laboratory products. A paragenesis Is also presented. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

Thesis (M.A.)--Boston University / PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you. / A photolytic method is developed for the homogeneous precipitation of barium sulfate. The method involves the addition of excess barium, as the EDTA complex, to the sulfur sample. An ammonium slycinate buffer is used to control the pH value and ammonium chloroacetate is added as the photo-sensitizing reagent. Irradiation of the mixture with 2537 radiation results in hydrolysis of chloroacetate with subsequent pH lowering and slow generation of barium sulfate precipitate. Precipitations were essentially complete after five hours. Easily filtered precipitates were obtained after digestion with a larse portion of ammonium nitrate. Photo-micrographs of the undigested precipitate indicate crystallines five to ten microns in diameter. Digestion of the precipitate results in formation of crystalline aggregates up to one hundred microns in diameter. After ignition, the precipitate was suitable for direct weighing and could be used as a basis for gravimetric sulfate determination. Samples containing between 10 milligrams and 120 milligrams of sulfate could be determined with an accuracy of ±0.2% or better. The precision of individual analyses was ±1 milligram sulfate for large samples and ±0.4 milligrams sulfate for smaller samples. / 2031-01-01

No description available.