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High-Resolution Electron Microscopy and Convergent-Beam Electron Diffraction of Sintered Undoped Hydroxyapatite

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Transmission electron microscopy (TEM) was used to characterize the microstructure of sintered undoped hydroxyapatite (OHAp). Conventional TEM observations were accom-panied by high-resolution electron microscopy (HREM) and convergent-beam electron diffraction (CBED) studies. CBED analysis enabled the determination of the space group of the OHAp, P63/m. Densification of the material was performed by pressureless sintering at 1250°C for 30 min. The undoped sample was comprised of apatite as the only crystalline phase, in addition to a small volume fraction (4%) of closed porosity. In general, the observed microstructure was homogeneous and consisted of equiaxed apatite grains with an average grain diameter of }1–2m. No indication of a residual amorphous phase, which may have formed during sintering, was observed at multigrain junctions. HREM studies on grain boundaries also revealed that no intergranular glass film was present along two-grain junctions, indicating that densification proceeded without a liquid phase. A slightly disordered region at the interfaces was observed, suggesting an extended grain-boundary structure.
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Document Type: Research Article

Affiliations: 1: Materials Research Institute, University of Bayreuth, D-95440 Bayreuth, Germany 2: Laboratoire de Mé tallurgie Physique, LSPES URA CNRS 234, Université de Lille, 59650 Villeneuve d'Ascq, France, and Max-Planck-Institute for Metal Research, D-70174 Stuttgart, Germany 3: Laboratoire de Cé ramiques Nouvelles, Université de Limoges, 87060 Limoges, France

Publication date: 1997-01-01

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