Abstract
X-ray powder diffraction of powder and sintered EBONEX (nominally Ti 4O 7) is reported. The patterns show clearly the existance of another Magneli phase (Ti 5O 9) in both forms of the material. Its concentration was determined from the integrated intensity ratios of the (101) vs. (101) the (121) vs. (121) and the (206) vs. (208) lines of Ti 4O 7 vs. Ti 5O 9, respectively. For samples taken from one batch, the powder form of EBONEX contains ca. 25±5 a% of Ti 5O 9 while the sintered form contains about twice as much. Samples from another batch, prepared under improved process control, showed ca. 10a% of Ti 5O 9 in the powder form of the material. Both forms contain small traces of other phases as well, e.g., Ti 3O 5 in the powder and Ti 6O 11 in the sintered material. These results agree with recently reported ESR line-broadening measurements. We also observed aging effects such as gradual oxidation in the sintered material.
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