Title of article :
Crystal structure, optical properties and colouring performance of karrooite MgTi2O5 ceramic pigments
Author/Authors :
Francesco Matteucci، نويسنده , , Giuseppe Cruciani ، نويسنده , , Michele Dondi، نويسنده , , Giorgio Gasparotto، نويسنده , , David Maria Tobaldi، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
15
From page :
3196
To page :
3210
Abstract :
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 M1 and M2 sites. 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.
Keywords :
crystal structure , Optical spectroscopy , Karrooite , Pseudobrookite , Ceramic pigment , Colour
Journal title :
JOURNAL OF SOLID STATE CHEMISTRY
Serial Year :
2007
Journal title :
JOURNAL OF SOLID STATE CHEMISTRY
Record number :
1332906
Link To Document :
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