Abstract As novel green pigment, various sodium iron phosphates, Na4Fe7(PO4)6, NaFe4(PO4)3, and Fe3(PO4)2, imitated with Xenophillite and Vivianite, were synthesized using a hydrothermal process. The obtained powders were estimated with X-ray diffraction (XRD), Infrared (IR) spectra, ultraviolet–visible (UV–vis) reflectance spectra, and L*a*b* color space. The hydrothermal temperature and time, volume of water, phosphorus resource were studied in this process. All samples prepared in this work were dark green powders. The weak peaks of Na4Fe7(PO4)6 and Fe3(PO4)2 were observed in XRD patterns of all samples. Hydrothermal treatment of a long duration produced high greenish powders. The large volume of water used improved the greenish and bluish colors of the phosphate powders.

中文翻译：

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仿天然矿石合成新型绿色磷酸盐颜料

摘要 作为新型绿色颜料，采用水热法合成了各种磷酸铁钠、Na4Fe7(PO4)6、NaFe4(PO4)3和Fe3(PO4)2，它们与Xenophillite和Vivianite相仿。获得的粉末通过 X 射线衍射 (XRD)、红外 (IR) 光谱、紫外-可见 (UV-vis) 反射光谱和 L*a*b* 颜色空间进行评估。在此过程中研究了热液温度和时间、水量、磷资源。本工作制备的所有样品均为深绿色粉末。在所有样品的 XRD 图中均观察到 Na4Fe7(PO4)6 和 Fe3(PO4)2 的弱峰。长时间的水热处理产生高绿色粉末。大量使用的水改善了磷酸盐粉末的绿色和蓝色。