Abstract—

New NZP-type solid solutions, Na_1+2xZr_2–xNi_x(PO₄)₃ and Ca_0.5+xZr_2–xNi_x(PO₄)₃ with x = 0.10, 0.25, and 0.50, have been prepared by solid-state reactions. The synthesized samples have been characterized by X-ray diffraction and IR spectroscopy. Crystal structure of the compound CaZr_1.5Ni_0.5(PO₄)₃ has been refined by full-profile X-ray diffraction analysis method, reliability factors is R_p = 4.78% and R_wp = 6.45%, respectively. Thermal expansion of the phosphates has been studied by high-temperature X-ray diffraction in the temperature range 25–700°C. The synthesized compounds have been shown to be intermediate- and low-thermal-expansion materials. Using SPS method we have produced ceramic samples with a high relative density (ρ_rel > 97%), based on phosphate powders. Strength characteristics (microhardness and fracture toughness) of the ceramics have been determined.

中文翻译：

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钠锆镍和磷酸钙锆镍磷酸盐的合成，热膨胀行为和烧结

摘要—

新的NZP型固溶体，Na _{1 + 2 x} Zr _{2– x} Ni _x（PO ₄）₃和Ca _{0.5+ x} Zr _{2– x} Ni _x（PO ₄）₃（x = _0.10、0.25和0.50）具有通过固态反应制备。合成的样品已通过X射线衍射和IR光谱进行了表征。化合物CaZr _1.5 Ni _0.5（PO ₄）_3的晶体结构已通过全轮廓X射线衍射分析方法精制，可靠性因子为R_p＝ 4.78％和R _wp＝ 6.45％。通过高温X射线衍射在25-700°C的温度范围内研究了磷酸盐的热膨胀。已显示合成的化合物是中等和低热膨胀材料。使用SPS方法，我们基于磷酸盐粉末生产了具有较高相对密度（_ρrel > 97％）的陶瓷样品。已经确定了陶瓷的强度特性（显微硬度和断裂韧性）。