Synthesis and characterization of inorganic pigments based on transition metal oxynitrides
Synthesis and characterization of inorganic pigments based on transition metal oxynitrides
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过渡金属氮氧化物无机颜料的合成与表征
DOI：
10.1557/jmr.2006.0272
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发表时间：
2006
影响因子：
2.7
通讯作者：
R. Sáez
中科院分区：
文献类型：
--
作者：
R. Pastrana;J. Isasi;R. Sáez
用溶胶凝胶法合成了Ta-−x(O/N)6和Ta(3−x)ZrxN(5−x)Ox(0≤x≤0.6)组成的Ta-Zr-O-N系非晶态氧化锆氮化物。得到了不同的颜色，从黄色到红色，其强度是每个样品中氮含量的函数。用Rietveld方法由粉末X射线衍射法对这些氮氧化物的结构进行了精炼。研究表明，斜钛矿相是在氮化初期形成的，然后转变为Ta3N5型相。在1123K以下，观察到具有单斜晶系对称性的斜晶石型结构，空间群为P21/c。随着氮化温度的升高，氮含量显著增加，材料采用Ta3N5结构，空间群C2/m。漫反射光谱和CIE-LaB色坐标表明，Ta_(3−x)Zrx(O/N)_6和Ta_(3−x)Zrx N_(5−x)Ox(0≤x≤0.6)固溶体有望成为新型生态颜料的候选化合物。
Tantalum zirconium oxynitrides in the Ta–Zr–O–N system of Ta_(3− x )Zr x (O/N)_6 and Ta_(3− x )Zr x N_(5−x)O x (0 ≤ x ≤ 0.6) compositions have been synthesized by the nitridation of the amorphous tantalum zirconium oxides, obtained by sol-gel technique, with flowing ammonia at temperatures in the range 1023–1123 K for several hours. Different coloration has been obtained, going from yellow to red, whose intensity is a function of the nitrogen content in each sample. The structure of these oxynitrides has been refined from powder x-ray diffraction by the Rietveld method. The present study shows that the baddeleyite phase is formed in the preliminary stages of the nitridation and then transformed to the Ta_3N_5-type phase. Below 1123 K, a baddeleyite-type structure with a monoclinic symmetry, space group P 2_1/ c , is observed in these phases. When the nitration temperature increases, a marked increase in the nitrogen content takes place, and these materials adopt the Ta_3N_5 structure, space group C 2/ m . Diffuse reflectance spectra and CIE-LAB color coordinates suggest that the solid solutions Ta_(3− x )Zr x (O/N)_6 and Ta_(3− x )Zr x N_(5− x )O x (0 ≤ x ≤ 0.6) are expected to be promising candidates for new ecological pigments.