THE INFLUENCE OF TEMPERATURE AND PREFERRED ORIENTATION ON HALL COEFFICIENT AND RESISTIVITY OF PURE TITANIUM
CALIFORNIA INST OF TECH PASADENA W M KECK LAB OF ENGINEERING MATERIALS
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The Hall coefficient is found to depend strongly on temperature and crystalline texture. At room temperature it has a value of -1.8 x 10 to the minus eleventh power cu mcoulomb in two specimens, whereas in the third it equals 1.2 x 10 to the minus eleventh power cu mcoulomb. Several factors including impurities, changes in the scattering mechanism, size effects, crystallographic anisotropy, which could account for the observed differences, are discussed and it is proposed that crystallographic orientation is the most influential factor. From the measured data and a phenomenological theory of the Hall effect developed in the case of single crystals, values of the components of the galvanomagnetic tensor, which replaces the scalar Hall coefficient of isotropic media, are calculated and discussed in connection with a possible model of the Fermi surface of titanium.
- Metallurgy and Metallography