Crystal structure, optical properties and colouring performance of karrooite MgTi2O5 ceramic pigments
Crystal structure, optical properties and colouring performance of karrooite MgTi2O5 ceramic pigments
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DOI：
10.1016/j.jssc.2007.08.029
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发表时间：
2007-11
影响因子：
3.3
通讯作者：
F. Matteucci;G. Cruciani;M. Dondi;G. Gasparotto;D. Tobaldi
中科院分区：
文献类型：
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作者：
F. Matteucci;G. Cruciani;M. Dondi;G. Gasparotto;D. Tobaldi
Karrooite，MgTi 2 O 5，是一种很有前途的陶瓷颜料，由于其高的耐火度和折射率，以及它的能力，主机过渡金属离子在两个晶体学上不同的八面体网站。结合X射线粉末衍射和UV-vis-NIR光谱研究了根据式Mg 1-xTi 2-xM 2xO 5（x=0.02和0.05）掺杂V、Cr、Mn、Fe、Co或Ni（M）的Karrooite的着色性能。过渡金属在钾铁矾晶格中的溶解度是不完全的，并且总是存在第二相（钙钛矿或金红石）。结构数据证明，将不同的发色团离子纳入karrooite结构影响晶胞参数，键长距离和角度，网站occupancy，因此阳离子有序-无序。光谱表现出广泛的吸收带的Co（II），Cr（IV），Fe（III），Mn（II），Mn（III），Ni（II），V（IV）的不同贡献的阳离子在M1和M2网站。钙钛矿颜料具有从橙子到棕褐色（Cr、Fe、Mn、V）到绿色（Co）和黄色（Ni）的颜色，其在低温（<1050°C）陶瓷釉料和玻璃状涂层中稳定。
Karrooite, MgTi2O5, is a promising ceramic pigment due to its high refractoriness and refractive indices, as well as its ability to host transition metal ions in two crystallographically distinct octahedral sites. The colouring performance was investigated combining X-ray powder diffraction with UV–vis–NIR spectroscopy on karrooite doped with V, Cr, Mn, Fe, Co or Ni (M) according to the formula Mg1−xTi2−xM2xO5, with x=0.02 and 0.05. Transition metals solubility in the karrooite lattice is not complete and a second phase is always present (geikielite or rutile). Structural data proved that incorporation of different chromophore ions into the karrooite structure affects unit cell parameters, bond length distances and angles, site occupancies and therefore cation order–disorder. Optical spectra exhibit broad absorbance bands of Co(II), Cr(IV), Fe(III), Mn(II), Mn(III), Ni(II), V(IV) with distinct contributions by cations in the M1and M2sites. Karrooite pigments have colours ranging from orange to brown-tan (Cr, Fe, Mn, V) to green (Co) and yellow (Ni) that are stable in low-temperature (<1050°C) ceramic glazes and glassy coatings.