Materials and Surface Science Institute, University of Limerick, National Technological Park, Limerick, Ireland.
J Mech Behav Biomed Mater. 2011 Nov;4(8):2063-73. doi: 10.1016/j.jmbbm.2011.07.005. Epub 2011 Jul 27.
The effects of ion substitution in hydroxyapatite (HA) on crystal structure and lattice stability is investigated in the green state and post sintering. The effects of ion incorporation on the biaxial flexural strength and hardness are also investigated. Sintering is carried out at 1200 °C using comparative conventional and microwave regimes. Post sintering, the effects of ion incorporation manifest as an increase in the lattice d-spacings and a reduction of the crystallite size. Some HA decomposition occurs with β-TCP stabilisation in conventional sintering (CS), but this phase is destabilised during microwave sintering (MS), generating α-TCP. Conventional sintering (CS) allows higher densification in the undoped samples. Overall, for the Sr-doped compositions, the MS samples retain higher amounts of HA and experience higher density levels compared to the CS samples.
研究了羟基磷灰石（HA）中离子取代对晶体结构和晶格稳定性的影响，包括绿色状态和烧结后阶段。还研究了离子掺入对双轴弯曲强度和硬度的影响。采用比较传统的和微波两种烧结制度，在 1200°C 下进行烧结。烧结后，离子掺入的影响表现为晶格 d 间距的增加和晶粒尺寸的减小。在传统烧结（CS）中会发生一些 HA 分解并稳定 β-TCP，但在微波烧结（MS）中该相被破坏，生成 α-TCP。传统烧结（CS）允许未掺杂样品实现更高的致密化。总体而言，对于 Sr 掺杂的组合物，与 CS 样品相比，MS 样品保留了更多的 HA，并且经历了更高的密度水平。
