caa a22 4500 388018798 CHVBK 20180307124918.0 cr unu---uuuuu 161130e199806 xx s 000 0 eng 10.1557/JMR.1998.0235 doi S088429140004471X pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0235 Morphology control and texture of hematite particles by dimethylformamide in forced hydrolysis reaction [Elektronische Daten] The effects of dimethylformamide (DMF) on morphology and texture of hematite particles produced from a forced hydrolysis reaction of FeCl3 -HCl solution were investigated by transmission electron microscopy (TEM), x-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), thermogravimetry and differential thermal analysis (TG-DTA), N2 and H2O adsorption, and zeta potential measurements. The morphology of synthetic hematite particles was concentration dependent; they changed from large sphere with a diameter of ca. 600 nm to diamond-like shape with increasing DMF concentration in the aging solution accompanying a reduction of their size to 80 nm without incorporation of DMF in the particles. This fact was explained by an acceleration of phase transformation from β-FeOOH to hematite with an elevation of the solution pH owing to dimethylamine produced from a hydrolysis of DMF at an elevated temperature. TEM and XRD suggested that the diamond-like hematite particles formed above 6-10 vol% DMF possess a single-crystal nature. Gas adsorption technique revealed that the particles produced above 10 vol% DMF possess a high thermal stability. TG and FTIR indicated that the hematite particles produced with DMF contained small amounts of OH_ ions in the lattice though they provided a single-crystal nature. Copyright © Materials Research Society 1998 Kandori Kazuhiko School of Chemistry, Osaka University of Education, Asahigaoka 4-698-1, Kashiwara-shi, Osaka 582-8582, Japan Ohkoshi Naoki School of Chemistry, Osaka University of Education, Asahigaoka 4-698-1, Kashiwara-shi, Osaka 582-8582, Japan Yasukawa Akemi School of Chemistry, Osaka University of Education, Asahigaoka 4-698-1, Kashiwara-shi, Osaka 582-8582, Japan Ishikawa Tatsuo School of Chemistry, Osaka University of Education, Asahigaoka 4-698-1, Kashiwara-shi, Osaka 582-8582, Japan Journal of Materials Research Cambridge University Press 13/6(1998-06), 1698-1706 0884-2914 13:6<1698 1998 13 JMR https://doi.org/10.1557/JMR.1998.0235 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0235 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kandori Kazuhiko School of Chemistry, Osaka University of Education, Asahigaoka 4-698-1, Kashiwara-shi, Osaka 582-8582, Japan NATIONALLICENCE 700 1- Ohkoshi Naoki School of Chemistry, Osaka University of Education, Asahigaoka 4-698-1, Kashiwara-shi, Osaka 582-8582, Japan NATIONALLICENCE 700 1- Yasukawa Akemi School of Chemistry, Osaka University of Education, Asahigaoka 4-698-1, Kashiwara-shi, Osaka 582-8582, Japan NATIONALLICENCE 700 1- Ishikawa Tatsuo School of Chemistry, Osaka University of Education, Asahigaoka 4-698-1, Kashiwara-shi, Osaka 582-8582, Japan NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/6(1998-06), 1698-1706 0884-2914 13:6<1698 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge