Monoclinic ↔ hexagonal phase transition in hydroxyapatite studied by X-ray powder diffraction and differential scanning calorimeter techniques

Hiroyuki Suda, Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

研究成果: Article同行評審

75 引文 斯高帕斯(Scopus)

摘要

We investigated the transition between the monoclinic (P21/b) and hexagonal (P63/m) phases of hydroxyapatite, Ca5(PO4)3OH, both by X-ray diffraction (XRD) and differential scanning calorimeter (DSC) techniques. Peak intensities of XRD of the low-temperature monoclinic phase were almost unchanged up to 473 K but dropped abruptly to zero above 483 K. Endo- and exothermic DSC peaks and a specific heat anomaly associated with the transition were observed. The transition enthalpy and entropy were estimated to be 630 ± 25 J/mol and 1.30 ± 0.05 J/mol·K, respectively.

原文English
頁(從 - 到)6752-6754
頁數3
期刊Journal of Physical Chemistry
99
發行號17
出版狀態Published - 1995 十二月 1

All Science Journal Classification (ASJC) codes

  • 工程 (全部)
  • 物理與理論化學

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