Zur Kenntnis der Ortho-Strontiumphosphate

Schnell, E.; Kiesewetter, W.; Kim, Y. H.; Hayek, E.

doi:10.1007/bf00917188

Cited by 8 publications

(3 citation statements)

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“…The strontium analogs differ from the calcium apatites in their crystallization characteristics under the same conditions. For example, octastrontium phosphate does not form under conditions suitable for the formation of octacalcium phosphate (Schnell, Kiesewetter, Kim & Hayek, 1971). Strontium chlorapatite differs structurally from the calcium analog in the position of chlorine.…”

Section: Introductionmentioning

confidence: 99%

Structure of partially substituted chlorapatite (Ca2Sr)5(PO4)3Cl

Sudarsanan¹,

Young²

1980

Acta Crystallogr Sect B

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The structural location and effect of Sr partially substituting for Ca in chlorapatite, Cas(PO4)3C1, have been determined from crystal structure refinements with X-ray data from three synthetic single crystals having Sr/Ca ratios from 0.02 to ~1.0. The crystals are all hexagonal with space group P63/m. When present in small amounts, Sr substitutes only for Ca(2) on the mirror plane but at a slightly different position, as accommodates its larger ion radius. With 48% replacement of Ca by Sr, 68% of the Ca(2) sites and 19% of the Ca(I) sites (on the threefold axis) were filled by Sr. The CI atom shifts from 0,0,0.44 in chlorapatite to 0,0,½, its position in Srs(PO4)3CI, with increasing Sr content, dz/dA [where A is amount of Sr(2) present[ being greatest initially. Vegard's law is obeyed within 2a. The larger ion size and its preferential substitution on the border of the easy diffusion channel are the only observed features that could correlate with the known cariostatic effect of Sr in human tooth enamel or with the reported slight preferential loss of Sr that has replaced Ca in bone.

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Section: Introductionmentioning

confidence: 99%

Structure of partially substituted chlorapatite (Ca2Sr)5(PO4)3Cl

Sudarsanan¹,

Young²

1980

Acta Crystallogr Sect B

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“…Although Sanfourche and Focet [16] concluded from wet-chemical studies that the system SrO-P20.5-HeO behaves analogously to the system CaO-P.,Os-H._,O, the strontium analogs of octocalcium phosphate and brushite do not exist [17,18]. Lorah, Tartar, and Wood [19] were able to synthesize strontium hydroxyapatite Srt0(PO06(OH)2, whereas Schnell et al [18] found that this apatite can incorporate large amounts of carbonate like the biological calcium hydroxyapatite.…”

Section: Introductionmentioning

confidence: 99%

“…Lorah, Tartar, and Wood [19] were able to synthesize strontium hydroxyapatite Srt0(PO06(OH)2, whereas Schnell et al [18] found that this apatite can incorporate large amounts of carbonate like the biological calcium hydroxyapatite.…”

Section: Introductionmentioning

confidence: 99%

Lattice parameters and cation distribution of solid solutions of calcium and strontium hydroxyapatite

1979

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Summary. Solid solutions of strontium and calcium hydroxyapatite were synthesized by solid-state reaction. Lattice parameters of these compounds were determined using two types of Guinier cameras. They vary linearly with the molar percentage of strontium hydroxyapatite. The distribution of Ca and Sr ions over the fourfold and sixfold positions in the apatite structure was determined by comparing experimental and calculated values for the intensity ratios of suitable reflections. A slight, although significant, preference of Sr for the sixfold position was found. An ideal behavior is predicted for these solid solutions.

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Stability of Calcium‐Strontium Hydroxyapatite Solid Solutions in Aqueous Solutions at 25°

Verbeeck

Driessens

Thun

et al. 1981

Bulletin des Soc Chimique

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Phase diagrams were constructed from phase equilibrium calculations for the quaternary system Ca(OH)2‐Sr (OH)2‐H3PO4‐H2O and for the system Ca(OH)2‐Sr(OH)2‐H3PO4‐HX(BOH)‐H20 at 25°. On the basis of these diagrams the stability field of solid solutions of calcium and strontium hydroxyapatite was derived. The calculations show the borderlines of the apatite field to be determined by the activity isotherms of the sparingly soluble phosphates CaHPO4.2H2O, Ca8H2(PO4)6.5H2O, β‐SrHPO4 or Sr6H3(PO4)5.2H2O depending on the pH and the molar cSr:cCa and cCa: cP ratios in the solution. The biological implications of these results are discussed.

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Zur Kenntnis der Ortho-Strontiumphosphate

Cited by 8 publications

References 0 publications

Structure of partially substituted chlorapatite (Ca2Sr)5(PO4)3Cl

Structure of partially substituted chlorapatite (Ca2Sr)5(PO4)3Cl

Lattice parameters and cation distribution of solid solutions of calcium and strontium hydroxyapatite

Stability of Calcium‐Strontium Hydroxyapatite Solid Solutions in Aqueous Solutions at 25°

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