Perovskite solid solutions in the BaO-CuO-Y2O3-Nb2O5 system |
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| Institution: | 1. Department of Chemical and Biomolecular Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea;2. Department of Mechanical Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea;1. College of Chemistry and Chemical Engineering and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University (Yaohu Campus), 99 Ziyangdadao Avenue, Nanchang, Jiangxi 330022, China;2. Department of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, Jiangxi, 330063, China;1. MTA-SZTE Supramolecular and Nanostructured Materials Research Group, Department of Medical Chemistry, Faculty of Medicine, University of Szeged, H-6720 Dóm square 8, Szeged, Hungary;2. Department of Physical Chemistry and Materials Sciences, University of Szeged, H-6720, Aradi v.t.1, Szeged, Hungary;1. Dept. of Chemical Sciences, University of Padova, Via F. Marzolo, 1, 35131, Padova, Italy;2. CNR-ICMATE, INSTM, Via F. Marzolo, 1, 35131, Padova, Italy;3. Dept. of Industrial Engineering – University of Padova, Via F. Marzolo, 9, 35131, Padova, Italy;1. L.N.Gumilyov Eurasian National University, Nur-Sultan, Kazakhstan;2. Institute of Nuclear Physics, Nur-Sultan, Kazakhstan;3. Kh. Dosmukhamedov Atyray University, Atyrau, Kazakhstan;4. A.Tsyb Medical Radiological Research Center – Branch of FSBI NMRRC of the Ministry of Health, Obninsk, Russia |
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| Abstract: | Freeze dried complex carboxylates are highly reactive precursors for complex perovskite solid solutions in the system BaO-CuO-Y2O3-Nb2O5 On thermal decomposition of the amorphous precursors the formation of complex crystalline phases begins at 600 °C. In most cases the themodynamically controlled phase composition is reached after a reaction time of two hours at about 900 °C. Beginning from the perovskite compound Ba2YNbO6 a partial substitution of Y by Cu or by a combination 2/3 Cu,1/3 Nb leads to extended fields of solid solutions with cubic perovskite structure. Substitution according to Y0,5xBa2(Y1-0,5xCuxNb)O6+x is limited to x ≤ 0,4. A compound LBa2Cu2NbO8 (x=2), well characterized for L=La, does not exist for L=Y. The composition of solid solutions depends on the preparation conditions. There are some signs for an inhomogeneous distribution of B-cations in the cubic perovskites. |
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