220. High-temperature phase equilibria in the system dicalcium silicate–tricalcium phosphate

Nurse, R. W.; Welch, J. H.; Gutt, W.

doi:10.1039/jr9590001077

Cited by 136 publications

(81 citation statements)

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“…However, data are available that a-TCP might be prepared at lower temperatures. Namely, at the turn of the millennium, the previously forgotten data that the presence of silicates stabilized a-TCP at temperatures of 800-1000°C (Nurse et al 1959) were rediscovered again. Such type of a-TCP is called ''silica stabilized a-TCP'' (Sayer et al 2003;Reid et al 2005Reid et al , 2006.…”

Section: A-tcpmentioning

confidence: 99%

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Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Dorozhkin¹

2017

Morphologie

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Section: A-tcpmentioning

confidence: 99%

“…To conclude, one should briefly mention on an existence of a 0 -TCP polymorph, which was discovered in 1959 (Nurse et al 1959). However, this TCP polymorph lacks of any practical interest because it only exists at temperatures between *1450°C and its melting point (*1756°C).…”

Section: A-tcpmentioning

confidence: 99%

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Dorozhkin¹

2017

Morphologie

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“…Three polymorphs are known: β, α and α` phases, from low to high temperature of stability respectively [112,113].…”

Section: Tricalcium Phosphatementioning

confidence: 99%

Crystalline Bioceramic Materials

Aza

2006

ChemInform

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A strong interest in the use of ceramics for biomedical engineering applications developed in the late 1960´s. Used initially as alternatives to metallic materials in order to increase the biocompatibility of implants, bioceramics have become a diverse class of biomaterials, presently including three basic types: relatively bioinert ceramics; bioactive or surface reactive bioceramics and bioresorbable ceramics. This review will only refer to bioceramics "sensus stricto", it is to say, those ceramic materials constituted for nonmetallic inorganic compounds, crystallines and consolidated by thermal treatments of powders to high temperatures. Leaving bioglasses, glass-ceramics and biocements apart, since, although all of them are obtained by thermal treatments to high temperatures, the first are amorphous, the second are obtained by desvitrification of a glass and in them vitreous phase normally prevails on the crystalline phases and the third are consolidated by means of a hydraulic or chemical reaction to room temperature. A review of the composition, physiochemical properties and biological behaviour of the principal types of crystalline bioceramics is given, based on the literature data and on the own experience of the authors. Key words: alumina, zirconia, zirconia-toughened alumina, graphite, hydroxyapatite, bioactive silicates, bioeutectic � , tricalcium phosphate Materiales biocerámicos cristalinosA finales de los años sesenta se despertó un gran interés por el uso de los materiales cerámicos para aplicaciones biomédicas. Inicialmente utilizados como una alternativa a los materiales metálicos, con el propósito de incrementar la biocompatibilidad de los implantes, las biocerámicas se han convertido en una clase diversa de biomateriales, incluyendo actualmente tres tipos: cerámicas cuasi inertes; cerámicas bioactivas o reactivas superficialmente y cerámicas reabsorbibles o biodegradables. En la presente revisión se hace referencia a las biocerámicas en sentido estricto, es decir, a aquellos materiales constitutitos por compuestos inorgánicos no metálicos, cristalinos y consolidados mediante tratamientos térmicos a altas temperaturas. Dejando aparte los biovidrios, los vitrocerámicos y los biocementos, puesto que, si bien todos ellos son obtenidos por tratamiento térmicos a altas temperaturas, los primeros son amorfos, los segundos son obtenidos por desvitrificación de un vidrio, prevaleciendo normalmente la fase vítrea sobre las fases cristalinas, y los terceros son consolidados mediante una reacción química o hidráulica a temperatura ambiente. Así pues, teniendo en cuenta la abundante bibliografía sobre el tema y la experiencia propia de los autores, se presenta una revisión de la composición, propiedades fisicoquímicas, aplicaciones y comportamiento biológico de los principales tipos de biocerámicas cristalinas.

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“…The system Ca2SiO4-Ca3(PO4) 2 forms a continuous series of solid solutions at higher temperatures, with the end members designated as a-Ca2SiO 4 and tq-Ca 3-(PO4) 2 (Nurse et al, 1959). The structures of aCa2SiO4 (Tr6mel & Moller, 1951; Van Valkenburg & McMurdie, 1947) and one intermediate phase, silicocarnotite, Cas(SiO4)(PO4) 2 (Dickens & Brown, 197 lb), are known to be related to that of glaserite.…”

mentioning

confidence: 99%

The crystal structure of α-Ca3(PO4)2

Mathew¹,

Schroeder²,

Dickens³

et al. 1977

Acta Crystallogr B Struct Crystallogr Cryst Chem

253

149

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ct-Ca3(PO4) 2 crystallizes in the monoclinic space group P2Ja with a= 12.887(2), b=27.280(4), c--15.219 (2) ,~,/~ = 126.20(1) °, and Z = 24. An approximate subcell with b' = b/3 exists. The structure was solved by direct methods of phase determination and refined to R = 0.051 and R,= 0.049 with 7002 reflections collected from a single crystal by counter methods. The structure consists of columns of cations, and columns of cations and anions with compensating cation vacancies, and is closely related to the structure of K3Na(SO4) 2, the mineral glaserite. The calcium ions in ct-Caa(PO4) 2 exhibit a wide range of coordination numbers and geometries.

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220. High-temperature phase equilibria in the system dicalcium silicate–tricalcium phosphate

Cited by 136 publications

References 0 publications

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Crystalline Bioceramic Materials

The crystal structure of α-Ca3(PO4)2

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