Phase relations and crystal chemistry of apatite and silicocarnotite solid solutions

Pliego-Cuervo, Y.B.; Glasser, F. P.

doi:10.1016/0008-8846(78)90033-9

Cited by 20 publications

(6 citation statements)

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“…One of the phases of this complex ternary system is the Ca 5-x (PO 4 ) 2+x (SiO 4 ) 1-x ; x ≤ 0.3 phase, also known as silicocarnotite (SC), which crystallizes in an orthorhombic structure, with a P nma space group and lattice parameters a = 6.737 Å, b = 15.5080 Å, and c = 10.132 Å exhibiting a wide range of solid solution with CaO, SiO 2 and P 2 O 5 [12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

“…One of the phases of this complex ternary system is the Ca 5‑ x (PO4) 2+ x (SiO4) 1– x ; x ≤ 0.3 phase, also known as silicocarnotite (SC), which crystallizes in an orthorhombic structure, with a Pnma space group and lattice parameters a = 6.737 Å, b = 15.5080 Å, and c = 10.132 Å exhibiting a wide range of solid solutions with CaO, SiO 2 , and P 2 O 5 . − SC is also considered a highly silicate-substituted HAp Ca 10 (PO 4 ) 6‑ x (SiO 4 ) x (OH) 2‑ x polymorphism with x = 2.0 resulting in the Ca 5 (PO 4 ) 2 SiO 4 stoichiometry. Similarities between SC and HAp structures have enabled the synthesis of SC, starting from a silicon-substituted apatite precursor using mechanochemical or aqueous precipitation methods. ,− In both cases, the structure of HAp is destabilized due to the formation of OH – vacancies into the hexagonal channel leading to SC formation through the incorporation of SiO 4 groups, which in turn partially substitute the PO 4 3– groups. ,, On the other hand, the sol–gel process or solid-state reaction synthesis routes have also been used to obtain a stoichiometric SC phase. − Regarding the biological properties of SC ceramics, in vitro studies have demonstrated the enhancement and acceleration of the osteogenic differentiation process of bone cells in comparison with HAp. ,, …”

Section: Introductionmentioning

confidence: 99%

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Apatite Mineralization Process from Silicocarnotite Bioceramics: Mechanism of Crystal Growth and Maturation

Rincón-López

Hermann-Muñoz

Cinca-Luis

et al. 2020

Crystal Growth & Design

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A mechanism for the formation and crystallization processes of bone-like apatite grown on non-stoichiometric silicocarnotite (SC) is here proposed. Single-phase SC powders and ceramics were obtained from fixed mixtures of hydroxyapatite and bioactive glass 45S5. The bioactive behavior of SC was assessed by immersion in Hank´s solution at different times.Afterward, a systematic theoretical-experimental study of the structural properties at the micro and nanoscale using TEM was performed and correlated with SEM, EDX, XRD, and Raman techniques to determine the apatite mineralization process from the SC phase. The initial stage of apatite formation from SC was identified as the hydration and further polymerization of silanol groups, resulting in a silica-based hydrogel, which plays a critical role in the ionic exchange. As a result of the adsorption of ionic species from the medium into the silica-based hydrogel, the precipitation of crystalline apatitic structures starts through the emergence of newly formed SC nanocrystals, which act as a template for the crystallization process of a substituted apatite with SC-like structure. Then, due to the polymorphism between SC and HAp structures, the apatite layer retains the SC periodic arrangement following an epitaxial-like growth mechanism. Identification of the apatite layer formation mechanism is critical to understand its physical and chemical properties, which controls the long-term dissolution/precipitation rate of bioactive materials and their performance in the biological environment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Apatite Mineralization Process from Silicocarnotite Bioceramics: Mechanism of Crystal Growth and Maturation

Rincón-López

Hermann-Muñoz

Cinca-Luis

et al. 2020

Crystal Growth & Design

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“…It is also worth noting that more extended solid solubility has been observed (Figs. [2][3][4] between ellestedite-silicosulphate than in the case of apatite-silicocarnotite, owing to their closer chemical and structural resemblance in the former case.…”

Section: Discussionmentioning

confidence: 92%

Solid Solubility of Apatites in Silicophosphates and Silicosulphates

Gunawardane¹

1993

J. Natn. Sci. Foundation Sri Lanka

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“…C 12 A 7 . Additionally this should also stabilize the formation of F-ellestadite [40]. Another impact arises from the formation of intermediate phases.…”

Section: Industrial Clinker Productionmentioning

confidence: 99%

Advances in understanding ye'elimite-rich cements

Haha

Winnefeld²,

Pisch³

2019

Cement and Concrete Research

118

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In this review, we discuss the recent advances in understanding ye'elimite-rich cements. These cements can be classified as follows:(1) low belite one namely called calcium sulphoaluminate cements (CSA) where the main use is in special applications or when combined with OPC and calcium sulphate sources in structural application (2) High belite one namely Belite Ye'elimite ferrite cement (BYF) where their development as an alternative low carbon binders is aimed to replace Portland clinker in structural applications.The main hydrating phase at early age in both systems is ye'elimite. Its formation, its reactivity and its extent of reaction and space filling when hydrating define the properties of the cement. Recent advances in understanding these properties are critically analyzed.Recent activities on the clinker formation and production at laboratory and industrial scale are reported. Additionally, the effects of aluminates rich minerals are reviewed in detail, with a focus on their influence on the hydration mechanism and the resulting hydrates assemblage and its stability in ye'elimite rich systems. Applicability of thermodynamic calculation and its limitations are discussed to underline the role of the environment at each reaction step on the hydrates assemblage.

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Phase relations and crystal chemistry of apatite and silicocarnotite solid solutions

Cited by 20 publications

References 1 publication

Apatite Mineralization Process from Silicocarnotite Bioceramics: Mechanism of Crystal Growth and Maturation

Apatite Mineralization Process from Silicocarnotite Bioceramics: Mechanism of Crystal Growth and Maturation

Solid Solubility of Apatites in Silicophosphates and Silicosulphates

Advances in understanding ye'elimite-rich cements

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