1990
DOI: 10.1557/proc-210-663
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Conductivity Mechanisms in Acceptor Doped KTaO3 Crystals

Abstract: The electrical conductivity of perovskite-structured KTaO 3 crystals acceptor doped with Co, Cu or Fe was investigated after treatments in oxidizing and reducing atmospheres under both wet and dry conditions. Isotope effect measurements (using HO vs. D0O) show that, after treatments in wet gases of low P(OC), all the crystals are primarily protonic conductors, through a process of proton hopping with an activation energy close to 0.84 eV.Electron hole conduction dominates at high P(O) in the case of Fe and Cu … Show more

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“…In KTO, the activation energies for proton conductivity, measured at high-temperature, are significantly larger than in BZO: protons have been incorporated in KTO doped by Fe 3+ [24,25], Mn 2+ [26] or Cu 2+ [27], with activation energies for conductivity between 0.73 and 1.02 eV [28,29]. The same kind of H/D isotope effect is observed as in many other perovskite oxides, with the activation energy for deuteron conductivity being larger than that for proton conductivity by ∼ 0.03-0.06 eV [28,29,25,30].…”
Section: Ktaomentioning
confidence: 99%
“…In KTO, the activation energies for proton conductivity, measured at high-temperature, are significantly larger than in BZO: protons have been incorporated in KTO doped by Fe 3+ [24,25], Mn 2+ [26] or Cu 2+ [27], with activation energies for conductivity between 0.73 and 1.02 eV [28,29]. The same kind of H/D isotope effect is observed as in many other perovskite oxides, with the activation energy for deuteron conductivity being larger than that for proton conductivity by ∼ 0.03-0.06 eV [28,29,25,30].…”
Section: Ktaomentioning
confidence: 99%