کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1464861 989673 2006 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The role of counterions (Mo, Nb, Sb, W) in Cr-, Mn-, Ni- and V-doped rutile ceramic pigments: Part 1. Crystal structure and phase transformations
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
The role of counterions (Mo, Nb, Sb, W) in Cr-, Mn-, Ni- and V-doped rutile ceramic pigments: Part 1. Crystal structure and phase transformations
چکیده انگلیسی

Rutile is widely used as ceramic pigment for its excellent optical properties, high melting point and intense coloration when doped with transition elements. Industrial ceramic pigments are manufactured from anatase plus chromophore elements (Cr, Mn, Ni or V) and counterions (Nb, Sb or W). Several solid state reactions occur during the synthesis, involving both the anatase-to-rutile transformation (A → R) and the formation of accessory phases. The A → R transition is heavily affected by chromophores with a lowering of the onset temperature: V < Cr < Ni < Mn; the effect of counterions is almost completely hidden by that of chromophores, even if the sequence Mo < Sb < W < Nb may be inferred. The crystal structure of rutile pigments is modified by chromophores and counterions doping; in fact, the doping varies the cell parameters, implies a progressive distortion of the octahedral site and a peculiar variation of the mean TiO bond length, with longer basal TiO distances and a shorter apical TiO distance. The pigment co-doped with V and W is different for its minimum TiO bond length distortion (BLD), an almost regular TiO6 octahedron, and the occurrence of Ti3+ within the accessory compound Ti5O9.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 32, Issue 4, 2006, Pages 385–392
نویسندگان
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