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

$48.00 plus tax (Refund Policy)

Download / Buy Article:

Abstract:

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.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1151-2916.1997.tb02788.x

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: January 1, 1997

Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more