Calcium phosphate apatites with variable Ca/P atomic ratio II. Calcination and sintering
The calcination and natural sintering of calcium deficient hydroxyapatite powders Ca 10− x (PO 4) 6− x (HPO 4) x (OH) 2− x (with 0⩽ x⩽1) were studied. For temperature below 700°C, particle coalescence occurs without densification. The particle coalescence is associated with a reduction of the specif...
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| Veröffentlicht in: | Biomaterials 2002-02, Vol.23 (4), p.1073-1080 |
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| creator | Raynaud, S Champion, E Bernache-Assollant, D |
| description | The calcination and natural sintering of calcium deficient hydroxyapatite powders Ca
10−
x
(PO
4)
6−
x
(HPO
4)
x
(OH)
2−
x
(with 0⩽
x⩽1) were studied. For temperature below 700°C, particle coalescence occurs without densification. The particle coalescence is associated with a reduction of the specific surface area. This surface decreases all the more as the Ca/P molar ratio of the powder is small. The mechanism agrees with a transfer of matter occurring by superficial diffusion, which is enhanced by the augmentation of vacancies in the apatitic structure (i.e. by a decrease of the Ca/P ratio). The sintering of compacted powders begins at 700°C. At the same temperature, the calcium deficient hydroxyapatites dissociate into biphasic mixtures of hydroxyapatite and tricalcium phosphate. The sintering is slowed down when the content of TCP in the biphasic mixture increases. In parallel, the grain size increases. This result relates to the augmentation of the coalescence of particles at low temperature. |
| doi_str_mv | 10.1016/S0142-9612(01)00219-8 |
| format | Article |
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10−
x
(PO
4)
6−
x
(HPO
4)
x
(OH)
2−
x
(with 0⩽
x⩽1) were studied. For temperature below 700°C, particle coalescence occurs without densification. The particle coalescence is associated with a reduction of the specific surface area. This surface decreases all the more as the Ca/P molar ratio of the powder is small. The mechanism agrees with a transfer of matter occurring by superficial diffusion, which is enhanced by the augmentation of vacancies in the apatitic structure (i.e. by a decrease of the Ca/P ratio). The sintering of compacted powders begins at 700°C. At the same temperature, the calcium deficient hydroxyapatites dissociate into biphasic mixtures of hydroxyapatite and tricalcium phosphate. The sintering is slowed down when the content of TCP in the biphasic mixture increases. In parallel, the grain size increases. This result relates to the augmentation of the coalescence of particles at low temperature.</description><identifier>ISSN: 0142-9612</identifier><identifier>EISSN: 1878-5905</identifier><identifier>DOI: 10.1016/S0142-9612(01)00219-8</identifier><identifier>PMID: 11791910</identifier><language>eng</language><publisher>Netherlands: Elsevier Ltd</publisher><subject>Biocompatible Materials - chemistry ; Calcination ; Calcium Phosphates - chemistry ; Ceramics - chemistry ; Hot Temperature ; Hydroxyapatite ; Hydroxyapatites - chemistry ; Materials Testing ; Microscopy, Electron, Scanning ; Particle Size ; Powders ; Sintering ; Surface Properties ; Tricalcium phosphate</subject><ispartof>Biomaterials, 2002-02, Vol.23 (4), p.1073-1080</ispartof><rights>2001 Elsevier Science Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c423t-230fae07bebbb19fcd2cbe50b34559d46223d525db2a41e43c5dbed3cb9ae1d03</citedby><cites>FETCH-LOGICAL-c423t-230fae07bebbb19fcd2cbe50b34559d46223d525db2a41e43c5dbed3cb9ae1d03</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/S0142-9612(01)00219-8$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>315,781,785,3551,27929,27930,46000</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/11791910$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Raynaud, S</creatorcontrib><creatorcontrib>Champion, E</creatorcontrib><creatorcontrib>Bernache-Assollant, D</creatorcontrib><title>Calcium phosphate apatites with variable Ca/P atomic ratio II. Calcination and sintering</title><title>Biomaterials</title><addtitle>Biomaterials</addtitle><description>The calcination and natural sintering of calcium deficient hydroxyapatite powders Ca
10−
x
(PO
4)
6−
x
(HPO
4)
x
(OH)
2−
x
(with 0⩽
x⩽1) were studied. For temperature below 700°C, particle coalescence occurs without densification. The particle coalescence is associated with a reduction of the specific surface area. This surface decreases all the more as the Ca/P molar ratio of the powder is small. The mechanism agrees with a transfer of matter occurring by superficial diffusion, which is enhanced by the augmentation of vacancies in the apatitic structure (i.e. by a decrease of the Ca/P ratio). The sintering of compacted powders begins at 700°C. At the same temperature, the calcium deficient hydroxyapatites dissociate into biphasic mixtures of hydroxyapatite and tricalcium phosphate. The sintering is slowed down when the content of TCP in the biphasic mixture increases. In parallel, the grain size increases. This result relates to the augmentation of the coalescence of particles at low temperature.</description><subject>Biocompatible Materials - chemistry</subject><subject>Calcination</subject><subject>Calcium Phosphates - chemistry</subject><subject>Ceramics - chemistry</subject><subject>Hot Temperature</subject><subject>Hydroxyapatite</subject><subject>Hydroxyapatites - chemistry</subject><subject>Materials Testing</subject><subject>Microscopy, Electron, Scanning</subject><subject>Particle Size</subject><subject>Powders</subject><subject>Sintering</subject><subject>Surface Properties</subject><subject>Tricalcium phosphate</subject><issn>0142-9612</issn><issn>1878-5905</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkUtLHEEQgJtgiKvxJ0T6JPEwWtUzPY9TkCWaBUFBA96aftRmW-aV7l6D_z6zD5KjnqoLvnp0fYx9QbhAwPLyAbAQWVOi-Ap4DiCwyeoPbIZ1VWeyAXnAZv-QQ3YU4zNMORTiEztErBpsEGbsaa5b69cdH1dDHFc6EdejTj5R5H98WvEXHbw2LfG5vrznOg2dtzxMxMAXiwu-Le83ac9173j0faLg-1-f2celbiOd7OMx-3n9_XH-I7u9u1nMr24zW4g8ZSKHpSaoDBljsFlaJ6whCSYvpGxcUQqROymkM0IXSEVupye53JpGEzrIj9nZru8Yht9rikl1PlpqW93TsI6qmv5clli_CYoKZD2d6F1gIapqAuUOtGGIMdBSjcF3OrwqBLWRpLaS1MaAAlRbSWqzyel-wNp05P5X7a1MwLcdQNPhXjwFFa2n3pLzgWxSbvBvjPgLN2OhKQ</recordid><startdate>20020201</startdate><enddate>20020201</enddate><creator>Raynaud, S</creator><creator>Champion, E</creator><creator>Bernache-Assollant, D</creator><general>Elsevier Ltd</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>8FD</scope><scope>JG9</scope><scope>7SR</scope><scope>F28</scope><scope>FR3</scope><scope>7X8</scope></search><sort><creationdate>20020201</creationdate><title>Calcium phosphate apatites with variable Ca/P atomic ratio II. Calcination and sintering</title><author>Raynaud, S ; Champion, E ; Bernache-Assollant, D</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c423t-230fae07bebbb19fcd2cbe50b34559d46223d525db2a41e43c5dbed3cb9ae1d03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Biocompatible Materials - chemistry</topic><topic>Calcination</topic><topic>Calcium Phosphates - chemistry</topic><topic>Ceramics - chemistry</topic><topic>Hot Temperature</topic><topic>Hydroxyapatite</topic><topic>Hydroxyapatites - chemistry</topic><topic>Materials Testing</topic><topic>Microscopy, Electron, Scanning</topic><topic>Particle Size</topic><topic>Powders</topic><topic>Sintering</topic><topic>Surface Properties</topic><topic>Tricalcium phosphate</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Raynaud, S</creatorcontrib><creatorcontrib>Champion, E</creatorcontrib><creatorcontrib>Bernache-Assollant, D</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Engineered Materials Abstracts</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>MEDLINE - Academic</collection><jtitle>Biomaterials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Raynaud, S</au><au>Champion, E</au><au>Bernache-Assollant, D</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Calcium phosphate apatites with variable Ca/P atomic ratio II. Calcination and sintering</atitle><jtitle>Biomaterials</jtitle><addtitle>Biomaterials</addtitle><date>2002-02-01</date><risdate>2002</risdate><volume>23</volume><issue>4</issue><spage>1073</spage><epage>1080</epage><pages>1073-1080</pages><issn>0142-9612</issn><eissn>1878-5905</eissn><abstract>The calcination and natural sintering of calcium deficient hydroxyapatite powders Ca
10−
x
(PO
4)
6−
x
(HPO
4)
x
(OH)
2−
x
(with 0⩽
x⩽1) were studied. For temperature below 700°C, particle coalescence occurs without densification. The particle coalescence is associated with a reduction of the specific surface area. This surface decreases all the more as the Ca/P molar ratio of the powder is small. The mechanism agrees with a transfer of matter occurring by superficial diffusion, which is enhanced by the augmentation of vacancies in the apatitic structure (i.e. by a decrease of the Ca/P ratio). The sintering of compacted powders begins at 700°C. At the same temperature, the calcium deficient hydroxyapatites dissociate into biphasic mixtures of hydroxyapatite and tricalcium phosphate. The sintering is slowed down when the content of TCP in the biphasic mixture increases. In parallel, the grain size increases. This result relates to the augmentation of the coalescence of particles at low temperature.</abstract><cop>Netherlands</cop><pub>Elsevier Ltd</pub><pmid>11791910</pmid><doi>10.1016/S0142-9612(01)00219-8</doi><tpages>8</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0142-9612 |
| ispartof | Biomaterials, 2002-02, Vol.23 (4), p.1073-1080 |
| issn | 0142-9612 1878-5905 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_71406618 |
| source | MEDLINE; Access via ScienceDirect (Elsevier) |
| subjects | Biocompatible Materials - chemistry Calcination Calcium Phosphates - chemistry Ceramics - chemistry Hot Temperature Hydroxyapatite Hydroxyapatites - chemistry Materials Testing Microscopy, Electron, Scanning Particle Size Powders Sintering Surface Properties Tricalcium phosphate |
| title | Calcium phosphate apatites with variable Ca/P atomic ratio II. Calcination and sintering |
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