caa a22 4500 467927448 CHVBK 20180406152933.0 cr unu---uuuuu 170328e20060501xx s 000 0 eng 10.1134/S002016850605013X doi (NATIONALLICENCE)springer-10.1134/S002016850605013X Structure and electrical conductivity of Ln2+ x Hf2− x O7− x /2 (Ln [Elektronische Daten] Sm-Tb; x = 0, 0.096) [A. Shlyakhtina, M. Boguslavskii, S. Stefanovich, I. Kolbanev, A. Knotko, O. Karyagina, S. Borisov, L. Shcherbakova] Data are presented on the evolution of the pyrochlore structure in the Ln2+x Hf2−x O7−δ (Ln = Sm, Eu; x = 0.096) solid solutions and Ln2Hf2O7 (Ln = Gd, Tb) compounds prepared from mechanically activated oxide mixtures. Sm2.096Hf1.904O6.952 is shown to undergo pyrochlore-disordered pyrochlore-pyrochlore (P-P1-P) phase transformations in the temperature range 1200-1670°C. The former transformation leads to a rise in 840°C conductivity from 10−4 to 3 × 10−3 S/cm in the samples synthesized at 1600°C, and the latter leads to a drop in 840°C conductivity to 6 × 10−4 S/cm in the samples synthesized at 1670°C. The reduction in the conductivity of Sm2.096Hf1.904O6.952 is accompanied by the disappearance of the assumed superstructure. In the range 1300-1670°C, Eu2+x Hf2−x O7−δ (x = 0.096) and Ln2Hf2O7 (Ln = Gd, Tb) have a disordered pyrochlore structure. The highest 840°C conductivity is offered by Eu2.096Hf1.904O6.952, Gd2Hf2O7, and Tb2Hf2O7 synthesized at 1670°C: 7.5 × 10−3, 5 × 10−3, and 2.5 × 10−2 S/cm, respectively. Pleiades Publishing, Inc., 2006 Shlyakhtina A. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut Boguslavskii M. Moscow State University, Vorob'evy gory 1, 119899, Moscow, Russia aut Stefanovich S. Moscow State University, Vorob'evy gory 1, 119899, Moscow, Russia aut Kolbanev I. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut Knotko A. Moscow State University, Vorob'evy gory 1, 119899, Moscow, Russia aut Karyagina O. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut Borisov S. Mendeleev University of Chemical Technology, Miusskaya pl. 9, 125047, Moscow, Russia aut Shcherbakova L. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut Inorganic Materials Nauka/Interperiodica 42/5(2006-05-01), 519-527 0020-1685 42:5<519 2006 42 10789 https://doi.org/10.1134/S002016850605013X text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S002016850605013X text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shlyakhtina A. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Boguslavskii M. Moscow State University, Vorob'evy gory 1, 119899, Moscow, Russia aut NATIONALLICENCE 700 1- Stefanovich S. Moscow State University, Vorob'evy gory 1, 119899, Moscow, Russia aut NATIONALLICENCE 700 1- Kolbanev I. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Knotko A. Moscow State University, Vorob'evy gory 1, 119899, Moscow, Russia aut NATIONALLICENCE 700 1- Karyagina O. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Borisov S. Mendeleev University of Chemical Technology, Miusskaya pl. 9, 125047, Moscow, Russia aut NATIONALLICENCE 700 1- Shcherbakova L. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Inorganic Materials Nauka/Interperiodica 42/5(2006-05-01), 519-527 0020-1685 42:5<519 2006 42 10789 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer