Structure refinements of Pb2+ ion-exchanged apatites by x-ray powder pattern-fitting

Michihiro Miyake; Kyoichi Ishigaki; Takashi Suzuki

doi:10.1016/0022-4596(86)90026-5

Structure refinements of Pb²⁺ ion-exchanged apatites by x-ray powder pattern-fitting

Michihiro Miyake, Kyoichi Ishigaki, Takashi Suzuki

Research output: Contribution to journal › Article › peer-review

65 Citations (Scopus)

Abstract

The crystal structures of Pb²⁺ ion-exchanged hydroxyapatite (OHAp), chlorapatite (ClAp), and fluorapatite (FAp) in aqueous solutions with low pH value of 3.0 or 4.0 have been investigated by X-ray powder pattern-fitting methods. The site occupancy factors of Pb atoms for the M1 (column site) and M2 sites were determined to be 0.72 and 0.77 for Pb_7.5Ca_2.5OHAp, 0.69 and 0.86 for Pb_7.9Ca_2.1ClAp, and 0.60 and 0.52 for Pb_5.5Ca_4.5FAp, respectively. These results imply that Ca²⁺ ions in calcium hydroxyapatite are exchanged for Pb²⁺ ions in acidic aqueous solution regardless of whether they occupy M1 or M2 sites.

Original language	English
Pages (from-to)	230-235
Number of pages	6
Journal	Journal of Solid State Chemistry
Volume	61
Issue number	2
DOIs	https://doi.org/10.1016/0022-4596(86)90026-5
Publication status	Published - Feb 1986
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/0022-4596(86)90026-5

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title = "Structure refinements of Pb2+ ion-exchanged apatites by x-ray powder pattern-fitting",

abstract = "The crystal structures of Pb2+ ion-exchanged hydroxyapatite (OHAp), chlorapatite (ClAp), and fluorapatite (FAp) in aqueous solutions with low pH value of 3.0 or 4.0 have been investigated by X-ray powder pattern-fitting methods. The site occupancy factors of Pb atoms for the M1 (column site) and M2 sites were determined to be 0.72 and 0.77 for Pb7.5Ca2.5OHAp, 0.69 and 0.86 for Pb7.9Ca2.1ClAp, and 0.60 and 0.52 for Pb5.5Ca4.5FAp, respectively. These results imply that Ca2+ ions in calcium hydroxyapatite are exchanged for Pb2+ ions in acidic aqueous solution regardless of whether they occupy M1 or M2 sites.",

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T1 - Structure refinements of Pb2+ ion-exchanged apatites by x-ray powder pattern-fitting

AU - Miyake, Michihiro

AU - Ishigaki, Kyoichi

AU - Suzuki, Takashi

PY - 1986/2

Y1 - 1986/2

N2 - The crystal structures of Pb2+ ion-exchanged hydroxyapatite (OHAp), chlorapatite (ClAp), and fluorapatite (FAp) in aqueous solutions with low pH value of 3.0 or 4.0 have been investigated by X-ray powder pattern-fitting methods. The site occupancy factors of Pb atoms for the M1 (column site) and M2 sites were determined to be 0.72 and 0.77 for Pb7.5Ca2.5OHAp, 0.69 and 0.86 for Pb7.9Ca2.1ClAp, and 0.60 and 0.52 for Pb5.5Ca4.5FAp, respectively. These results imply that Ca2+ ions in calcium hydroxyapatite are exchanged for Pb2+ ions in acidic aqueous solution regardless of whether they occupy M1 or M2 sites.

AB - The crystal structures of Pb2+ ion-exchanged hydroxyapatite (OHAp), chlorapatite (ClAp), and fluorapatite (FAp) in aqueous solutions with low pH value of 3.0 or 4.0 have been investigated by X-ray powder pattern-fitting methods. The site occupancy factors of Pb atoms for the M1 (column site) and M2 sites were determined to be 0.72 and 0.77 for Pb7.5Ca2.5OHAp, 0.69 and 0.86 for Pb7.9Ca2.1ClAp, and 0.60 and 0.52 for Pb5.5Ca4.5FAp, respectively. These results imply that Ca2+ ions in calcium hydroxyapatite are exchanged for Pb2+ ions in acidic aqueous solution regardless of whether they occupy M1 or M2 sites.

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Structure refinements of Pb²⁺ ion-exchanged apatites by x-ray powder pattern-fitting

Abstract

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