ࡱ> .0-5@*bjbj22 `IXXclll8t8888`Q Q Q $RE |Q 8`u\8(`nA:,Z6`, 0 Wla@ \r0.r"rrQ h J <? vQ Q Q H$HInfluence of Zn-doping on the properties of synthetic goethite S. Krehula1, S. Musi1, }. Skoko2 and S. Popovi2 1 Division of Materials Chemistry, Ruer Boakovi Institute, P.O. Box 180, HR-10002 Zagreb, Croatia 2 Department of Physics, Faculty of Science, University of Zagreb, P.O. Box 331, HR-10002 Zagreb, Croatia The influence of Zn-doping on the properties of -FeOOH was investigated by X-ray powder diffraction, Fourier transform infrared and 57Fe Mssbauer spectroscopies. -FeOOH was synthesized at a highly alkaline pH by precipitation from the FeCl3 solution with the addition of tetramethylammonium hydroxide and autoclaving at 160 C [S. Krehula, S. Popovi, S. Musi, Mater, Lett. 54 (2002) 108]. The Zn-doped samples with nominal molar ratio values (expressed as 100[Zn]/{[Zn]+[Fe]}) equal to 0.99, 1.96, 2.91, 4.76, 6.98, 9.09, 11.11 and 13.04 mole % were precipitated in the same way, but in the presence of varying ZnCl2 concentrations. XRD patterns showed the presence of an -FeOOH-related phase (solid solution of the type -(Fe, Zn)OOH) as a single phase up to 9.09 mole % Zn. Upon increasing the amount of Zn-dopant XRD lines were gradually broadened. Upon doping, small shifts in diffraction lines were observed, dependent on the Miller indices, ind,~űtaM=)ta'h'h'CJH*OJQJaJmH sH h0CJOJQJaJmH sH 'hfh #CJH*OJQJaJmH sH $hfhTw_CJOJQJaJmH sH $hfhGCJOJQJaJmH sH *hfhG5CJH*OJQJaJmH sH 'hfhTw_5CJOJQJaJmH sH 'hfhG5CJOJQJaJmH sH hTw_CJ mH sH hfh'5OJQJmH sH hfh{5OJQJmH sH hfhTw_5OJQJmH sH ~ #&)))"*$*T*V*****gd?b $h`ha$gd=*G$ed`ea$gdr< dh^`$a$$a$gd\$dha$$a$$a$gdG))*2 4 R T ȲrnYGY5Y"h CJOJQJ^JaJmH sH "hvCJOJQJ^JaJmH sH (h'h]-CJOJQJ^JaJmH sH hTw_(h'h<CJOJQJ^JaJmH sH (h'hTw_CJOJQJ^JaJmH sH +h'hTw_CJH*OJQJ^JaJmH sH +h'h 1ZCJH*OJQJ^JaJmH sH hGh\H*OJQJmH sH $hfhTw_CJOJQJaJmH sH 'hfh #CJH*OJQJaJmH sH T j l   ` x ĮĆq`N`qq9(h'h-CJOJQJ^JaJmH sH #h'h6S6CJOJQJ^JaJ h'h6SCJOJQJ^JaJ(h'h6SCJOJQJ^JaJmH sH +h'hTw_CJH*OJQJ^JaJmH sH "h)}CJOJQJ^JaJmH sH +h'hTw_CJH*OJQJ^JaJmH sH (h'hTw_CJOJQJ^JaJmH sH (h'h]-CJOJQJ^JaJmH sH "h CJOJQJ^JaJmH sH   *.0246:<>FJL\^4ʸʣʎʣyydyܸyO(h'hTw_CJOJQJ^JaJmH sH (h'hz(CJOJQJ^JaJmH sH (h'h-CJOJQJ^JaJmH sH (h'hpCJOJQJ^JaJmH sH (h'hCJOJQJ^JaJmH sH "hn5CJOJQJ^JaJmH sH "hCJOJQJ^JaJmH sH "h9CJOJQJ^JaJmH sH "h `CJOJQJ^JaJmH sH 4X`bd~TxñuuuucQ<(h'h]-CJOJQJ^JaJmH sH "hn5CJOJQJ^JaJmH sH "h9CJOJQJ^JaJmH sH (h'h-CJOJQJ^JaJmH sH "hvCJOJQJ^JaJmH sH (h'hTw_CJOJQJ^JaJmH sH "h!}CJOJQJ^JaJmH sH +h'h!}CJH*OJQJ^JaJmH sH (h'h!}CJOJQJ^JaJmH sH "hc*CJOJQJ^JaJmH sH <Xpt"X"~""""""""""ܵ}kVkDǑ}"hn5CJOJQJ^JaJmH sH (hn5hjLCJOJQJ^JaJmH sH "hjLCJOJQJ^JaJmH sH "hvCJOJQJ^JaJmH sH U"h&pCJOJQJ^JaJmH sH "hJCJOJQJ^JaJmH sH "haPCJOJQJ^JaJmH sH (h'hTw_CJOJQJ^JaJmH sH "hc*CJOJQJ^JaJmH sH "h1CJOJQJ^JaJmH sH icating an anisotropy in lattice expansion. XRD pattern of the sample with 13.04 mole % Zn showed the presence of ZnFe2O4 and -Fe2O3, besides the dominant phase having the structure type of -FeOOH. FT-IR spectra showed a clear influence of the amount of Zn-dopant in the -FeOOH structure on the positions of the bands. O-H in-plane bending (O-H) band shifted from 893 to 888 cm-1, O-H out-of-plane bending (O-H) band shifted from 796 to 800 cm-1, whereas Fe-O stretching band shifted from 638 to 629 cm-1 with nominal molar ratio value increased up to 11.11 mole % Zn. RT Mssbauer spectra of undoped -FeOOH and Zn-doped -FeOOH samples showed a distribution of the hyperfine magnetic field. mm decreased from 34.9 T for an undoped -FeOOH to 25.5 T for a Zn-doped -FeOOH with 9.09 mole % Zn. 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