Doctoral Dissertations

Abstract

"The construction of the apparatus for production of powder patterns at a definite temperature and the technique for evaluation of x-ray powder patterns by the asymmetric method are described in detail, and the mode of error elimination is discussed.

A new scanning device is designed for use in x-ray diffraction work.

A modified method is described for the determination of densities of solids, which eliminates some of the difficulties interfering with other similar methods thus far proposed. Formulae are derived for the calculation of density as well as for reduction of density at a desired temperature.

The following conclusion are drawn from the results of the present investigation:

The minor impurities found in the diamond samples are not dissolved but are included mechanically in the diamond crystals.

The coefficient of expansion of diamond and silicon lattices, as determined by the present experiments, are in agreement with the respective data in the literature. Although there are no data available in the literature concerning the coefficient of expansion of germanium, the value reported here (5.93 x 10-6) is reliable.

The density values of the purest elements, silicon and germanium, deviate considerably from those recorded in the literature.

The crystal lattices of diamond, silicon, and germanium are sound or contain imperfections of the order of magnitude not exceeding the respecting limits of error of the present experiments.

The diamond is more reliable than quartz for use as a standard substance in the x-ray diffraction work.

The asymmetric method is precise and convenient in its application to accurate determinations of the unit cell dimensions of crystalline materials. The method requires no standard substances and no mathematical corrections for calculation of lattice constants except that for refraction of x-rays.

The densities of purest silicon and germanium should be investigated more thoroughly, preferably using the modified procedure described.

It is further recommended that a study be made of the effects of impurities on the lattice coefficients of expansion of silicon and germanium"--Abstract.

Advisor(s)

Straumanis, Martin E., 1898-1973

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Metallurgical Engineering

Publisher

Missouri School of Mines and Metallurgy

Publication Date

1951

Pagination

viii, 198 pages

Note about bibliography

Includes bibliographical references (pages 194-197).

Rights

© 1951 Esrefettin Zeki Aka, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

X-rays -- Diffraction
Crystal lattices -- Mathematical models
Scientific apparatus and instruments -- Design and construction

Thesis Number

T 946

Print OCLC #

9517456

Electronic OCLC #

927299895

Comments

Two title pages, a two-page Abstract and two-page Acknowledgements precede the Table of Contents, which is numbered page i.

Included in

Metallurgy Commons

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