THERMAL CHANGE OF HYDROTALCITE-TYPE LAYERED DOUBLE HYDROXIDE Al_2Li(OH)_6[Fe(CN)_6]_<1/4>・nH_2O UNDER OXIDIZING AND REDUCING ATMOSPHERES
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概要
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A hydrotalcite-type layered double hydroxide Al_2Li(OH)_6[Fe(CN)_6]_<1/4>・nH_2O (Fe(CN)_6-LDH) was synthesized by a coprecipitation method and its thermal change under oxidizing and reducing atmospheres were investigated. The synthesized Fe(CN)_6-LDH consisted of plate shaped particles of 0.1-0.2μm in size and the lattice parameters were those of a hexagonal cell with a=5.06 and c=31.92Å. The interlayer spacing between the LDH octahedral layers was estimated to be 5.8Å and was occupied by 0.25 [Fe(CN)_6]^<4-> anions and 1.8H_2O as the above chemical formula. The [Fe(CN)_6]^<4-> anions in the interlayers were octahedral in structure and oriented with their individual 3-fold axes perpendicular to the LDH layers. The specific surface area measured by the BET method using N_2 gas as the adsorbate was 108.9m^2/g. The Fe(CN)_6-LDH decomposed upon firing up to 260℃ and changed into LiAl_5O_8 and Li_2CO_3, and finally into LiAl_5O_8 and α-LiAlO_2 at higher temperatures. For sample fired under an oxidizing atmosphere of flowing dry air the Fe component in the Fe(CN)_6-LDH incorporated into LiAl_5O_8 by substituting for Al atoms whereas it segregated and dispersed in the samples as fine particles by firing under a reducing atmosphere of flowing H_2 gas. The resulting particles were γ-Fe_2O_3 in the samples fired at temperatures between 450℃ and 490℃ and α-Fe above 500℃. The γ-Fe_2O_3 particles were several nm in size but increased rapidly upon elevating the firing temperature, up to submicron meter in α-Fe particles.
著者
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HAYASHI Shigeo
Department of Applied Physics and Chemistry, University of Electro-Communications
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Okada Kiyoshi
Department Of Metallurgy & Ceramic Science Tokyo Institute Of Technology
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Okada K
Department Of Metallurgy And Ceramics Science Tokyo Institute Of Technology
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Yasumori Atsuo
Department Of Metallurgy And Ceramics Science Tokyo Institute Of Technology
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Hayashi Shigeo
Department Of Metallurgy And Ceramics Science Tokyo Institute Of Technology:research Institute Of Ma
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Yasumori Atsuo
Department Of Materials Science And Technology Faculty Of Industrial Science And Technology Tokyo Un
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MATSUSHITA FUMIAKI
Sumitomo Metal Minning Co.
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Hayashi Shigeo
Department Of Applied Physecs And Chemistry University Of Electro-communications
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Okada Kiyoshi
Department Of Inorganic Materials Faculty Of Engineering Tokyo Institute Of Technology
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Okada Kiyoshi
Department Of Electronic Control Engineering Nagaoka National College Of Technology
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