The Sr 3d X‐ray photoelectron spectroscopy (XPS) spectrum of Sr‐containing hydroxyapatite (SHAp) overlaps completely with the P 2p spectrum. Thus, the chemical state identification of Sr in SHAp is a challenging task. In this work, the Sr 3d spectrum was isolated from the overlapping spectra for analyzing the chemical state of Sr using a generic peak‐fitting method. The SHAp layers containing various Sr concentrations were produced on a Ti substrate using a chemical treatment process with a calcium phosphate slurry that included Sr (NO₃)₂. The distribution of the constituent elements changed according to the Sr concentration, implying that the chemical state of Sr varied with concentration. The isolation of the Sr 3d XPS spectrum was conducted via spectral deconvolution using the P 2p spectrum corresponding to HAp. The isolated Sr 3d spectrum revealed that the chemical state of Sr was in SrO and Sr‐substituted HAp states, and their ratio varied with the Sr concentration in the layer. The SrO to Sr‐substituted HAp ratios affected the Sr ion releasing behavior from the SHAp layer, supporting the validity of the obtained analytical results.

中文翻译：

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含锶羟基磷灰石中Sr 3d XPS光谱的光谱分析

含Sr羟基磷灰石（SHAp）的Sr 3d X射线光电子能谱（XPS）光谱与P 2p光谱完全重叠。因此，SHAp中Sr的化学状态识别是一项艰巨的任务。在这项工作中，从Sr 3d光谱中分离出Sr 3d光谱，以便使用通用的峰拟合方法分析Sr的化学状态。使用包含Sr（NO ₃）_2的磷酸钙浆料通过化学处理工艺在Ti基板上生产出含有各种Sr浓度的SHAp层。组成元素的分布根据Sr浓度而变化，这意味着Sr的化学状态随浓度而变化。Sr 3d XPS光谱的分离是通过使用对应于HAp的P 2p光谱通过反卷积进行的。分离出的Sr 3d光谱表明，Sr的化学态为SrO和Sr取代的HAp态，并且它们的比率随层中Sr浓度的变化而变化。SrO与Sr取代的HAp的比例影响了SHAp层中Sr离子的释放行为，从而支持了所获得分析结果的有效性。