Inhibition of sintering by Si during the conversion of Si-rich ferrihydrite to hematite
The distribution and chemical state of Si in a synthetic 2-line ferrihydrite with a Si/(Si+Fe) molar ratio of 0.11 was studied. Heat treatment under oxidizing conditions shows that Si-rich ferrihydrite is stable to 400°C. The transformation to hematite and the formation of a polymerized amorphous-si...
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| Veröffentlicht in: | Clays and clay minerals 2000-02, Vol.48 (1), p.51-56 |
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| container_title | Clays and clay minerals |
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| creator | Glasauer, Susan M Hug, Paul Weidler, Peter G Gerhring, Andreas U |
| description | The distribution and chemical state of Si in a synthetic 2-line ferrihydrite with a Si/(Si+Fe) molar ratio of 0.11 was studied. Heat treatment under oxidizing conditions shows that Si-rich ferrihydrite is stable to 400°C. The transformation to hematite and the formation of a polymerized amorphous-silica phase occur at 850°C. At this temperature, the specific surface area decreases greatly and the average pore diameter increases, which is indicative of sintering. Heating under severe reducing conditions causes a segregation of Si from Fe and results in a mixture of elemental Fe and SiO2. Surface and structural data suggest that Si is located near the particle surface where it limits the rearrangement of Fe octahedra to form hematite. |
| doi_str_mv | 10.1346/ccmn.2000.0480106 |
| format | Article |
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Heat treatment under oxidizing conditions shows that Si-rich ferrihydrite is stable to 400°C. The transformation to hematite and the formation of a polymerized amorphous-silica phase occur at 850°C. At this temperature, the specific surface area decreases greatly and the average pore diameter increases, which is indicative of sintering. Heating under severe reducing conditions causes a segregation of Si from Fe and results in a mixture of elemental Fe and SiO2. Surface and structural data suggest that Si is located near the particle surface where it limits the rearrangement of Fe octahedra to form hematite.</description><identifier>ISSN: 0009-8604</identifier><identifier>EISSN: 1552-8367</identifier><identifier>DOI: 10.1346/ccmn.2000.0480106</identifier><identifier>CODEN: CLCMAB</identifier><language>eng</language><publisher>Boulder, CO: Clay Minerals Society</publisher><subject>chemical properties ; chemical reactions ; clay mineralogy ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; experimental studies ; ferrihydrite ; geochemistry ; hematite ; Mineralogy ; Non silicates ; oxides ; polyhedra ; sed rocks, sediments ; Sedimentary petrology ; silicon ; sintering ; X-ray diffraction data</subject><ispartof>Clays and clay minerals, 2000-02, Vol.48 (1), p.51-56</ispartof><rights>GeoRef, Copyright 2020, American Geosciences Institute.</rights><rights>2000 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a440t-c7aec53d27c903954aceefe130358f196528a2ada40d0536ff4480abf1eddab53</citedby><cites>FETCH-LOGICAL-a440t-c7aec53d27c903954aceefe130358f196528a2ada40d0536ff4480abf1eddab53</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=1283828$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Glasauer, Susan M</creatorcontrib><creatorcontrib>Hug, Paul</creatorcontrib><creatorcontrib>Weidler, Peter G</creatorcontrib><creatorcontrib>Gerhring, Andreas U</creatorcontrib><title>Inhibition of sintering by Si during the conversion of Si-rich ferrihydrite to hematite</title><title>Clays and clay minerals</title><description>The distribution and chemical state of Si in a synthetic 2-line ferrihydrite with a Si/(Si+Fe) molar ratio of 0.11 was studied. Heat treatment under oxidizing conditions shows that Si-rich ferrihydrite is stable to 400°C. The transformation to hematite and the formation of a polymerized amorphous-silica phase occur at 850°C. At this temperature, the specific surface area decreases greatly and the average pore diameter increases, which is indicative of sintering. Heating under severe reducing conditions causes a segregation of Si from Fe and results in a mixture of elemental Fe and SiO2. Surface and structural data suggest that Si is located near the particle surface where it limits the rearrangement of Fe octahedra to form hematite.</description><subject>chemical properties</subject><subject>chemical reactions</subject><subject>clay mineralogy</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>experimental studies</subject><subject>ferrihydrite</subject><subject>geochemistry</subject><subject>hematite</subject><subject>Mineralogy</subject><subject>Non silicates</subject><subject>oxides</subject><subject>polyhedra</subject><subject>sed rocks, sediments</subject><subject>Sedimentary petrology</subject><subject>silicon</subject><subject>sintering</subject><subject>X-ray diffraction data</subject><issn>0009-8604</issn><issn>1552-8367</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><recordid>eNpFUMtOwzAQtBBIlMIHcPOBG0pZv9LkiCIelQocCuIYOc66cdXalR1A_XtSWonDane0MyPNEHLNYMKEzO-M2fgJB4AJyAIY5CdkxJTiWSHy6SkZDZ8yK3KQ5-QipRUAz6XgI_I5851rXO-Cp8HS5HyP0fklbXZ04Wj79Qf6DqkJ_htjOhIXLovOdNRijK7btdH1SPtAO9zofrgvyZnV64RXxz0mH48P79VzNn97mlX380xLCX1mphqNEi2fmhJEqaQ2iBaZAKEKy8pc8UJz3WoJLSiRWyuHeLqxDNtWN0qMCTv4mhhSimjrbXQbHXc1g3rfTF1VL6_1vpn62MyguTlotjoZvbZRe-PSv5AXohhmTG4PtCWGZBx6gz8hrtt6Fb6iH0IdXYUoeSl-ARuHc-U</recordid><startdate>20000201</startdate><enddate>20000201</enddate><creator>Glasauer, Susan M</creator><creator>Hug, Paul</creator><creator>Weidler, Peter G</creator><creator>Gerhring, Andreas U</creator><general>Clay Minerals Society</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20000201</creationdate><title>Inhibition of sintering by Si during the conversion of Si-rich ferrihydrite to hematite</title><author>Glasauer, Susan M ; Hug, Paul ; Weidler, Peter G ; Gerhring, Andreas U</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a440t-c7aec53d27c903954aceefe130358f196528a2ada40d0536ff4480abf1eddab53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><topic>chemical properties</topic><topic>chemical reactions</topic><topic>clay mineralogy</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>experimental studies</topic><topic>ferrihydrite</topic><topic>geochemistry</topic><topic>hematite</topic><topic>Mineralogy</topic><topic>Non silicates</topic><topic>oxides</topic><topic>polyhedra</topic><topic>sed rocks, sediments</topic><topic>Sedimentary petrology</topic><topic>silicon</topic><topic>sintering</topic><topic>X-ray diffraction data</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Glasauer, Susan M</creatorcontrib><creatorcontrib>Hug, Paul</creatorcontrib><creatorcontrib>Weidler, Peter G</creatorcontrib><creatorcontrib>Gerhring, Andreas U</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Clays and clay minerals</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Glasauer, Susan M</au><au>Hug, Paul</au><au>Weidler, Peter G</au><au>Gerhring, Andreas U</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Inhibition of sintering by Si during the conversion of Si-rich ferrihydrite to hematite</atitle><jtitle>Clays and clay minerals</jtitle><date>2000-02-01</date><risdate>2000</risdate><volume>48</volume><issue>1</issue><spage>51</spage><epage>56</epage><pages>51-56</pages><issn>0009-8604</issn><eissn>1552-8367</eissn><coden>CLCMAB</coden><abstract>The distribution and chemical state of Si in a synthetic 2-line ferrihydrite with a Si/(Si+Fe) molar ratio of 0.11 was studied. Heat treatment under oxidizing conditions shows that Si-rich ferrihydrite is stable to 400°C. The transformation to hematite and the formation of a polymerized amorphous-silica phase occur at 850°C. At this temperature, the specific surface area decreases greatly and the average pore diameter increases, which is indicative of sintering. Heating under severe reducing conditions causes a segregation of Si from Fe and results in a mixture of elemental Fe and SiO2. Surface and structural data suggest that Si is located near the particle surface where it limits the rearrangement of Fe octahedra to form hematite.</abstract><cop>Boulder, CO</cop><pub>Clay Minerals Society</pub><doi>10.1346/ccmn.2000.0480106</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| source | SpringerLink Journals - AutoHoldings |
| subjects | chemical properties chemical reactions clay mineralogy Earth sciences Earth, ocean, space Exact sciences and technology experimental studies ferrihydrite geochemistry hematite Mineralogy Non silicates oxides polyhedra sed rocks, sediments Sedimentary petrology silicon sintering X-ray diffraction data |
| title | Inhibition of sintering by Si during the conversion of Si-rich ferrihydrite to hematite |
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