《Table 2 Values of LDH-NO3-CO3 lattice parameters》

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《Liquid precipitation and microstructure of Mg_6Al_2(OH)_(15)NO_3CO_3·4H_2O whiskers》

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Fig.2 shows the X-ray diffraction patterns of the six samples.To confirm the LDH-NO3-CO3 whiskers，we compare these patterns with the quasi-diffraction patterns of LDH-NO3-CO3 whiskers（14-JCPDS 0191）.Patterns of the six samples are identical in relative signal strength and standard diffraction profile.Next，we calculate the half peak width for（003）:Sample 1 at0.82?，Sample 2 at 0.78?，Sample 3 at 0.55?，Sample 4at 0.38?，Sample 5 at 0.49?，and Sample 6 at 0.51?.The sharpest diffraction peak of Sample 4 for the（003），（006） ，and（009）planes proves that it possesses the best crystallinity.The crystallinities of Samples 1，2，3，5，and 6 are relatively poor.The order of crystallinity of the 6 samples ranks as follows:Sample 4>Sample 5>Sample 6>Sample 3>Sample 2>Sample 1.Table 1lists the maximum diffraction intensity and the corresponding d values of the 6 samples for the（003），（006） ，and（009）crystal planes.From Table 1，the d003value of Sample 4 is twice its d006 value and thrice its d009 value.These findings show that Sample 4 has a very neat board，whereas the multiple relationships for the other five samples were relatively poor.Thus，we could determine the minimum half peak width of Sample 4 based on the diffraction intensity.The crystallinity of Sample 4 is the highest and that of Sample 1 is the lowest.In addition，from the diffraction curve，besides Sample 4，all the other samples have a hybrid peak，which indicates they contain impurities.