CaHPO_4是卤磷酸钙荧光粉的主要原料,其化学组份的控制和其它物理性能十分重要,小于1%的化学计量变化(指Ca/P之比),都可能明显降低荧光粉的亮度。而Ca_5(PO_4)_3OH是制备CaHPO_4中的主要杂相,因此采用X射线衍射定量测定CaHPO_4中的杂相Ca_5(PO_4)_3OH,对于检验CaHPO_4的质量,提高卤磷酸钙荧光粉的发光性能具有重要意义。在X射线衍射定量相测定技术中,K值法告诉 CaHPO_4 is the main raw material of calcium halophosphate phosphor. Its chemical composition control and other physical properties are very important. A stoichiometric change of less than 1% (referring to Ca / P ratio) may significantly reduce the brightness of the phosphor. However, Ca_5 (PO_4) _3OH is the major heterogeneous phase in the preparation of CaHPO_4. Therefore, the quantitative determination of heterophasic Ca_5 (PO_4) _3OH in CaHPO_4 by X-ray diffraction is very important to test the quality of CaHPO_4 and improve the luminescent properties of CaF_2 phosphor significance. In X-ray diffraction quantitative phase measurement techniques, K value method told