Monou, Moo02, und Mo,,O,, die elektrische Leitfiihigkeit und der Magnetowiderstand im Temperaturbereich 4,2 K < T < 300 K bei magnetischen Lnduktionen bis zu 7 T gemeeeen. Dabei tritt mit zunehmendem Sauerstoffgehalt der Verbindungen ein ubergang von der metallischen Leitfahigkeit zur Halbleitung bei kritischen Abstiinden der Metallionen auf. Die Substitution von Molybdiin durch Wolfram in der Phase Mo,,O,, bewirkt eine Leitfahigkeitsabnah'me in den terniiren Verbindungen.In the binary system molybdenum-oxygen the electrical conductivity and the mRgnetoresistance is meaeured for the phases Mo,in the temperature range 4.2 K < T < 300 K at magnetic inductions up to 7 T. With increaaing oxygen content of the compounds a transition from metallic conductivity to semiconductivity occura a t critical distances of the metal ions. The substitution of molybdenum by tungsten in the phase Mq,O,, causes a decrease of conductivity of the ternary compounds. ') Peteregeese 16, A-8010 Grez, bterreich.
In continuation of the investigations of the electrical and thermal conductivity as well as the magneto resistance in the binary system titanium‐oxygen for TiOx with metallic conductivity for x < 1.49 the corresponding properties for the semiconductive compounds with 1.49 < x < 2 are measured at low temperatures and magnetic inductions up to 15 T, especially the corundum phase Ti2O3, the Magnéli phase Ti4O7 and the reduced rutil phase TiO2−ϵ in dependence on oxygen content and temperature.
In the binary system titanium–oxygen the electrical and thermal conductivity and the magnetoresistance is measured at low temperature and at magnetic inductions up to 15 T. In part I the results for the phases of TiOx with x < 1.49 and h.c.p. and f.c.c. crystal structures with large phases of homogeneity are discussed in dependence on variations of the oxygen concentration and temperature.
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