摘要
以锶(Sr)为置换原子,采用化学共沉淀法制备了Sr含量不同的钙羟基磷灰石粉体(Ca_x-Sr_y-HAp),通过X射线衍射(XRD)、红外光谱(FT-IR)和荧光分析(PL)等研究了锶含量对钙羟基磷灰石晶体结构和发光性能的影响.XRD分析表明,锶在钙羟基磷灰石中的掺杂对样品的结构、结晶性、晶粒尺寸和晶面间距等影响较大,随着锶含量增加,XRD图谱中主特征峰位置逐渐向小角度偏移.FT-IR图谱也表明了晶体中锶含量的增加会引起内部键合强度的变化,并引起磷酸根的振动峰红移.光谱分析表明,不同锶含量的稀土掺杂锶钙羟基磷灰石样品(Ca_x-Sr_y-HAp:Eu)的荧光发射强度及荧光寿命等均呈现随基质中锶含量的增加先增加后减小的变化,在锶含量约为70mol%处出现最大值,这种荧光性能的改变是锶对钙的掺杂引起的基质晶格及结构变化所致.
A series of strontium(Sr)doped Ca-hydroxyapatite(Ca-HAp)materials with different content of Sr were prepared using simple chemical co-precipitation method herein.The effection of doped Sr ions on the crystalline structure,bonding state and luminescent property of materials was studied by X-ray diffraction(XRD),infrared spectrophotometer(IR)and fluorescence spectrophotometer(PL).It is found that the crystalline structure,crystalline size,interplanar spacing and peak position of powders were influenced and changed by increasing of Sr content in the Ca-HAp as a result of difference in atoms radius.The FT-IR spectrum of Sr doped HAps contain the featured peaks of HAp and a little shift from Ca-O banding to Sr-O banding.Furthermore,the photoluminescent intensity(I)and fluorescent lifetime(τ)were both enhanced firstly and decreased subsequently according to the increasing of Sr in HAp matrix.The maximum of both I andτwere reached in the samples containing 70mol% Sr.It is indicated that the change in the crystalline structure and bonding resulted from heterogeneous doping is the main reason to the PL property of Sr and Eu codoped CaHap materials.
出处
《陕西科技大学学报（自然科学版）》
2016年第4期54-58,70,共6页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(51472151)
陕西科技大学大学生创新创业训练计划项目(201510708156)
