caa a22 4500 467943362 CHVBK 20180322200724.0 cr unu---uuuuu 170328e19861001xx s 000 0 eng 10.1007/BF02402996 doi (NATIONALLICENCE)springer-10.1007/BF02402996 (NATIONALLICENCE)springer-10.1007/BF00553794 Nogami Masayuki Government Industrial Research Institute of Osaka, 1-8-31 Midorigaoka Ikeda-city, 563, Osaka, Japan aut Crystal growth of tetragonal ZrO2 in the glass system ZrO2-SiO2 prepared by the sol-gel process from metal alkoxides [Elektronische Daten] [Masayuki Nogami] Glasses in the system ZrO2-SiO2 containing 40 to 60 mol % ZrO2 were prepared by the sol-gel process from metal alkoxides. Tetragonal ZrO2 was precipitated by heat treatment at 800 and 1200° C, and its crystal growth was measured by differential thermal and X-ray diffraction analyses. At 800 to 900° C, tetragonal ZrO2 crystals grew three-dimensionally and the activation energy for growth was calculated as about 680 kJ mol−1. On the other hand, the secondary growth of tetragonal ZrO2 at 1000 to 1200° C followed the cube-root-of-time law. The activation energy for secondary growth was about 380 kJ mol−1. It is suggested that the diffusion of Zr4+ ions is the rate-limiting process for the secondary crystal growth of tetragonal ZrO2. Chapman and Hall Ltd, 1986 Journal of Materials Science Kluwer Academic Publishers 21/10(1986-10-01), 3513-3516 0022-2461 21:10<3513 1986 21 10853 https://doi.org/10.1007/BF02402996 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02402996 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Nogami Masayuki Government Industrial Research Institute of Osaka, 1-8-31 Midorigaoka Ikeda-city, 563, Osaka, Japan aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers 21/10(1986-10-01), 3513-3516 0022-2461 21:10<3513 1986 21 10853 NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00553794 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer