ÐÏà¡±á>þÿ :<þÿÿÿ9ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿì¥Áq`ð¿v%bjbjqPqP 4*::·ÿÿÿÿÿÿ¤ „ „ „ ˜ \\\\4˜ è 2¨¨¨¨¨K K K + - - - - - - $"h‚$ÒQ Q„ Ò G K Ò Ò Q ¨¨Ÿ¢ žžžÒ R¨„ ¨+ žÒ + žžŽ¬b "„ ÿ¨œp§Ëiº2É\êL»+ ¸ 0è Ë4T%6T% ÿT%„ ÿ,K _ žm y YK K K Q Q RLK K K è Ò Ò Ò Ò ˜ ˜ ˜ Ä\˜ ˜ ˜ \˜ ˜ ˜ ÿÿÿÿUTJECAJ ADITIVA NA KRISTALIZACIJU HEMATITA IZ GUSTIH VODENIH SUSPENZIJA AKAGANEITA THE INFLUENCE OF ADDITIVES ON THE CRYSTALLIZATION OF THE HEMATITE FROM DENSE AKAGANAITE AQUEUS SUSPENSIONS Mark }IC, Mira RISTI, Svetozar MUSI Zavod za kemiju materijala, Institut Ruer Boakovi , P. p.180, 10000 Zagreb Hematite (að-Fe2O3) is widespread mineral in nature (rocks, sediments, soils). It is also important material in many technological applications. Chemical and physical properties of að-Fe2O3 depend on the route of chemical synthesis. In the present work, the hydrothermal crystallization of að-Fe2O3 from dense bð-FeOOH suspensions was investigated. að-Fe2O3 particles in the form of double spheres with the ring were formed at 160 oC for 24 h. The orientation effect of að-Fe2O3 subunits in double spheres with the ring was observed. að-Fe2O3 double spheres with the ring also showed two narrow particle size distributions. bð-FeOOH transformed to að-Fe2O3 by the dissolution/repreciptation mechanism. The influence of inorganic anions on the phase composition, size and morphology of the particles during the transformation bð-FeOOH to að-Fe2O3, was also investigated. With increased concentration of phosphate anion the crystallization of að-Fe2O3 was strongly suppressed. Tendency&Bê @ V z | ~ Ž ¨ À È Ê þ 4 > B L d h j ~ € † ˆ Š Œ òçòçòçòÜÎÂº¯º¯ ‘…‘…‘…‘vn_nSnSnhÀ>Yhˆ vCJH*aJhÀ>Yhˆ vCJOJQJaJhˆ vCJaJh›K¨h1œCJaJmHsHh›K¨CJaJmHsHh›K¨hÃqyCJaJmHsHh›K¨h›K¨CJaJmHsHhDlÖhÃqymHsHhDlÖmHsHhÂa”hDlÖ>*mHsHhÃqyh1œ5CJ\aJh«w5CJ\aJh1œ5CJ\aJhÃqyh«w5CJ\aJ¦ê| ~ Ê h j Š#Œ#¤#@$à$n%p%r%t%v%÷÷÷÷÷÷çÛÓÓÓÓÓÑÑÑÓ$a$gdnã$„Ä`„Äa$gdnã$„e„_^„e`„_a$gd1œ$a$gdÃqyn%t%þþ – À Â Ò Ü Þ à ÒÔÚÜÞàâ8^`j„ª¬²´¶¸ÐÒ $ & ( * , ^ ` ° øðèàðàðØàèøèàÅ¶¥¶¥èàààÅ¶¥¶¥ŽÅ¶¥¶¥à‚sh:~h:~CJaJmH sH h:~CJaJmH sH h:~h:~CJOJQJaJh:~CJaJ h:~hÂa”CJEHúÿaJmH sH h:~hÂa”CJaJmH sH $h:~hÂa”CJOJQJaJmH sH hK,CJaJhÂa”CJaJh¦}?CJaJhˆ vCJaJhc!CJaJ*° ¾ À Ø ŠŒ’”–˜:<>jlrtvxzÊÌàâèôãôÔÁÔ°Ô°ÔÁÔ°Ô°Ôô ”rarar”N”r$hnãhK_ŠCJOJQJaJmH sH h:~hK_ŠCJEHúÿaJmH sH h:~hK_ŠCJaJmH sH $h:~hK_ŠCJOJQJaJmH sH hK_ŠCJaJmH sH hnãCJOJQJaJmH sH h:~h:~CJEHúÿaJmH sH $h:~h:~CJOJQJaJmH sH h:~h:~CJaJmH sH hÂa”ha+ÇCJEHaJmH sH ha+ÇCJaJmH sH èêìî®°¶¸º¼¾”–œž ¢¤@”–œž ¢T V \ ^ ` b ª ¬ ² ´ ¶ ¸ ò !ïàïÔÁ²¡²¡²ÔŸÔÁ²¡²¡²Ô—ˆ}p}p}ˆ}p}p}ˆ}p}p}hh4TCJaJhëOýhëOýCJEHúÿaJhëOýhëOýCJaJhëOýhëOýCJOJQJaJhëOýCJaJU h:~hnãCJEHúÿaJmH sH h:~hnãCJaJmH sH $h:~hnãCJOJQJaJmH sH hK_ŠCJaJmH sH h:~hK_ŠCJaJmH sH h:~hK_ŠCJEHúÿaJmH sH ( to the formation of ferrihydrite was noticed. The size and morphology of að-Fe2O3 particles were strongly influenced with added ammonium amidosulphonate (AAS). Up to 24 h of autoclaving the peanut-type að-Fe2O3 particles of good uniformity were obtained. They consisted of laterally arrayed primary aðFe2O3 particles. Porosity of peanut-type að-Fe2O3 particles was visible. With prolonged autoclaving time up to 72 h and starting concentration 0.1 M AAS, a gradual formation of interconnected (with neck) double cupolas was observed. The cross-section of these cupolas showed that they consisted of linear chains of small interconnected að-Fe2O3 particles directed from the center towards the surface of cupola. References: [1] Mark }ic, Mira Risti , Svetozar Musi, J. Alloys Comp. 464 (2008) 81-88. [2] Mark }ic, Mira Risti , Svetozar Musi, J. Alloys Comp. 466 (2008) 498 506. [3] Mark }ic, Mira Risti , Svetozar Musi, J. Mol. 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