Surface Free Energy and Morphology of Chlorapatite Crystals Grown from Sodium Chloride Flux

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  • Takaomi Suzuki
    Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University
  • Mitsunobu Shimuta
    Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University
  • Shuji Oishi
    Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University

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<jats:title>Abstract</jats:title> <jats:p>Well-formed crystals of barium chlorapatite [Ba5Cl(PO4)3] and strontium chlorapatite [Sr5Cl(PO4)3] were grown from a sodium chloride flux. The contact angle of water on the () face of each chlorapatite crystal was observed using a modified Wilhelmy method, where we measured the change of liquid weight instead of the crystal weight. The contact angle depends on the aspect ratio of the crystal. Both the advancing and receding contact angles were larger for Ba5Cl(PO4)3 and Sr5Cl(PO4)3 crystals with larger aspect ratios. The surface free energy of the () face was calculated using Neumann’s equation. The () face of the crystals of larger aspect ratios has a smaller surface free energy, indicating that such crystals have a more stable () face than the crystals of smaller aspect ratios. This result corresponds to the morphology of the chlorapatite crystals because the crystals have a tendency to elongate into the [0001] direction.</jats:p>

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