Структура и свойства электроосажденных в импульсном режиме наноструктурированных массивов ZnO и нанокомпозитов ZnO/Ag на их основе

Kopach, V. R.; Klepikova, E. S.; Клочко, Н.П.; Хрипунов, Г.С.; Korsun, V. E.; Любов, В.Н.; Kirichenko, M. V.; Kopach, A. V.

doi:10.21883/ftp.2017.03.44206.8303

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“…Такие керамики имеют ряд преимуществ по сравнению с материалами, полученными по более дорогим технологиям, поскольку дают возможность изготавливать изделия различных форм и размеров, в том числе с варьированием их морфологии и структурно−фазового состояния. Это позволяет контролировать их функциональные свойства путем изменения размеров частиц в исходной шихте; температур, длительности и атмосферы синтеза и термообработок, а также типа легирующих агентов в керамиках [2][3][4].…”

Section: Introductionunclassified

Structure and electric properties of zink oxide−based ceramics doped with iron

Pashkevich

Kasyuk

Bliznyuk³

et al. 2019

Izv. vysš. učebn. zaved., Mater. èlektron. teh.

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The structure and electrical properties of (FexOy)10 (ZnO)90 ceramics (0 ≤ x ≤ 3; 1 ≤ y ≤ 4) synthesized in air by one− and two−stage method were studied. To dope ZnO, powders of FeO, α−Fe2O3, and Fe3O4 or a mixture (α−Fe2O3 + FeO) were used. On the basis of X−ray diffraction analysis, gamma−resonance spectroscopy and Raman spectroscopy, it was established that at fixed average iron concentrations of 1—3 at.% in ceramic samples, at least three phases are formed: solid solution Zn1−δFeδO with wurtzite structure and residual iron oxides FexOy, used as doping agents. Scanning electron microscopy and energy−dispersive X−ray analysis have shown that, in the studied ceramics, the grain sizes of the wurtzite phase decreased from several tens of micrometers using one−step synthesis to the submicron level for the case of two−step synthesis. It was found that the incorporation of iron into ZnO leads to a contraction of the crystal lattice in the wurtzite phase and the stronger, the higher the proportion of oxygen in the doping iron oxides FexOy. The study of the temperature dependences of the electrical resistivity have shown that deep donor centers with an activation energy of about 0.35 eV are formed in the wurtzite phase Zn1−δFeδO. The temperature dependences of the electrical resistivity in the undoped ZnO in the temperature range of 6—300 K and in the doped ceramics (FexOy)10(ZnO)90, obtained by the one−step synthesis method, at temperatures below 50 K, are characterized by a variable activation energy, which indicates a strong disordering of their structure.

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Section: Introductionunclassified