水热法制备的不同氢氧化钠/碱式碳酸锆摩尔浓度（0.77, 1.57, 2.30, 3.06, 3.83）的氧化锆纳米颗粒的XRD谱图

可以明显地观察到，对于立方氧化锆晶体，样品的所有衍射峰位置都与国际衍射数据中心(ICDD)一致。氧化锆的衍射峰分别为30.12、34.96、50.22和59.74，分别对应于(111)、(200)、(220)和(311)晶面。根据Scherrer方程可以发现，随着钠碳比的降低，氧化锆的晶粒尺寸变大。

The XRD patterns of the samples of the ZrO₂ NPs by the hydrothermal method under the molar concentration ratio of sodium hydroxide/zirconium basic carbonate (Na/C) from 0.77 to 3.83. It can be obviously observed that all of the diffraction peak positions of the samples were in good agreement with the International Center for Diffraction Data (ICDD) for cubic ZrO₂ crystal. The diffraction peaks of ZrO₂ at 30.12°, 34.96°, 50.22°, and 59.74°, which correspond to the crystal planes of (111), (200), (220), and (311) respectively. It can be found that as the ratio of Na/C decreases, the grain size of the ZrO₂ NPs becomes larger according to Scherrer's equation.