Phosphate cancrinite (PO₄-CAN) has been synthesized under mild hydrothermal conditions at 473 K using kaolin, sodium orthophosphate-dodecahydrate and strong alkaline conditions (8 M NaOH solution). Cancrinite crystals of rod-like habit and maximum lengths up to 2 μm were observed and characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS) and Fourier transform infrared spectroscopy (FTIR). Magic angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) of the nucleus ³¹P, thermogravimetry (TG/DTG) and heating experiments under open conditions in a furnace were additionally performed. The empirical formula Na₈[SiAlO₄]₆(PO₄)_0.58(CO₃)_0.13(H₂O)_4.6 was calculated from EDXS analyses and TG data under consideration of a minor carbonate content, detected by FTIR spectroscopy. PO₄-CAN is stable up to 800 °C before thermal destruction rapidly occurs at 825 °C. The final product of TG analyses at 1000 °C is a mixture of a nepheline-like phase and the phosphate content of the initial cancrinite sample. XRD and FTIR results of the synthesis product are in good agreement with literature data of the rare mineral depmeierite.

中文翻译：

---

磷酸钙锌矿 (PO4-CAN) 的合成和性质

已在 473 K 温和水热条件下使用高岭土、正磷酸钠十二水合物和强碱性条件（8 M NaOH 溶液）合成了磷酸盐钙锌矿 (PO ₄ -CAN)。通过X射线粉末衍射（XRD）、扫描电子显微镜（SEM）、能量色散X射线光谱（EDXS）和傅里叶变换红外光谱（红外光谱）。另外进行了核³¹ P 的魔角旋转核磁共振光谱（MAS NMR）、热重分析（TG/DTG）和在炉中开放条件下的加热实验。经验式 Na ₈ [SiAlO ₄ ] ₆ (PO₄ ) _0.58 (CO ₃ ) _0.13 (H ₂ O) _4.6由EDXS分析和TG数据计算得出，考虑到通过FTIR光谱检测的少量碳酸盐含量。PO ₄ -CAN 在高达 800 °C 的温度下保持稳定，然后在 825 °C 下迅速发生热破坏。在 1000 °C 下 TG 分析的最终产品是霞石状相和初​​始钙铁矿样品的磷酸盐含量的混合物。合成产物的XRD和FTIR结果与稀有矿物贫铁矿的文献数据吻合良好。