Doctoral Dissertations

Abstract

"Relative intensity measurements of X-ray powder diffraction lines were made of compositions in the region ZrTe₀.₅ to ZrTe₂.₀, fired between 600º and 817ºC in evacuated sealed tubes. The experimental relative intensities of samples between ZrTe and ZrTe₂ were compared with values calculated for several theoretical models with different Zr vacancy ordering schemes and Te vacancy concentrations. The most probable structural model for compositions in the range ZrTe to ZrTe₁.₅ is one in which the number of Zr vacancies located at z = 0 ranges from 0% to 30%, with the concentration of Te vacancies ranging from 0 to 35%. A structural model of 15% Zr vacancies at z = 0 and Te vacancy concentrations of 0 to 5% is proposed for compositions in the range ZrTe₁.₅ to ZrTe₂. X-ray results indicate a two-phase region between ZrTe₀.₇ and ZrTe₁.₃ in the temperature range from 650º to 817ºC. The phases are hexagonal Zr₄Te₃ and a ZrTe-ZrTe₂ superlattice. Two-phase material, with a mean composition of ZrTe₁.₅₅, was observed visually in other samples fired at 600º and 817ºC. All the tellurides reacted with atmospheric moisture at room temperature"--Abstract, page ii.

Advisor(s)

Sorrell, Charles A.

Committee Member(s)

O'Keefe, T. J. (Thomas J.)
James, William Joseph
Gerson, Robert, 1923-2013
Clark, J. B. (J. Beverley)
Moore, Robert E., 1930-2003

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Ceramic Engineering

Publisher

University of Missouri--Rolla

Publication Date

1972

Pagination

ix, 277 pages

Note about bibliography

Includes bibliographical references (pages 102-103).

Rights

© 1972 Frances Dolores Jenkins, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Zirconium compounds
Tellurides
X-rays -- Diffraction

Thesis Number

T 2618

Print OCLC #

6038640

Electronic OCLC #

876716608

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