Growth of Barium Chlorapatite Crystals from a Sodium Chloride Flux

Large and well-formed crystals of strontium chlorapatite [Sr5Cl(PO4)3] were grown for the first time from a sodium chloride flux. The obtained crystals were colorless and transparent. The crystal growth of Sr5Cl(PO4)3 was conducted by heating a mixture of solute and flux at 1100 °C for 10 h, and then cooling to 500 °C at a rate of 5 °C h−1. Hexagonal prismatic crystals with lengths of up to 8.6 mm and widths of 2.1 mm were grown from high-temperature solutions containing 0.05–0.9 mol% solute. The most suitable solute content for the growth of prismatic crystals was 0.2 mol%. The prismatic crystals were bounded by the {101-0} and {101-1} faces. The aspect ratios were in the region of 1.1 to 4.2. Hexagonal needle crystals with lengths of up to 2.6 mm and widths of 60 µm were obtained during every growth run. The needle crystals were elongated in the directions, with aspect ratios ranging from 33 to 66. The major constituents were almost homogeneously distributed in the prismatic and needle crystals. ...

[1]  S. Oishi,et al.  Topotaxial Conversion of Chlorapatite and Hydroxyapatite to Fluorapatite by Hydrothermal Ion Exchange , 2000 .

[2]  S. Oishi,et al.  Topotaxial replacement of chlorapatite by hydroxyapatite during hydrothermal ion exchange , 1999 .

[3]  S. Oishi,et al.  Growth of Chlorapatite Crystals from a Sodium Chloride Flux , 1997 .

[4]  M. Jemal,et al.  Thermochemistry of phosphate products. Part I: Standard enthalpy of formation of tristrontium phosphate and strontium chlorapatite , 1997 .

[5]  J. Moffat,et al.  Surface and bulk properties of stoichiometric and nonstoichiometric strontium hydroxyapatite and the oxidation of methane , 1996 .

[6]  Tsutomu Tanaka,et al.  Photostimulated Luminescence and Structural Characterization of Ba5 ( PO 4 ) 3Cl : Eu2 + Phosphors , 1994 .

[7]  Marco Bettinelli,et al.  Gain measurements of Mn5+(3d2) doped Sr5(PO4)3Cl and Ca2PO4Cl , 1992 .

[8]  C. Tarrio,et al.  A surface recombination model applied to large features in inorganic phosphor efficiency measurements in the soft x-ray region , 1991 .

[9]  P. Day,et al.  Electronic spectrum of the manganate(V) ion in different host lattices , 1981 .

[10]  H. Aoki,et al.  Structure of barium chlorapatite , 1979 .

[11]  M. Greenblatt,et al.  Electron spin resonance of CrO43− in barium chloroapatite, Ba5(PO4)3Cl , 1979 .

[12]  P. Day,et al.  Electronic spectrum of chromate(V) ion in Sr5(PO4)3Cl host lattice , 1979 .

[13]  R. Young,et al.  Structure refinement and random error analysis for strontium `chlorapatite', Sr5(PO4)3Cl , 1974 .

[14]  J. G. Verriet,et al.  The formation of strontium and bariumchlorapatite from strontium and bariumorthophosphate and hydrochloric acid , 1970 .

[15]  G. Engel,et al.  I.R. spectra of the phosphate ions in various apatites , 1970 .

[16]  L. Brixner,et al.  Preparation and properties of some strontium-oxometallates , 1970 .

[17]  L. Brixner,et al.  Inorganic single crystals from reactions in fused salts , 1968 .

[18]  A. Mckeag,et al.  Copper and Tin‐Activated Halophosphate Phosphors , 1959 .