Cobalt aluminate blue spinels

Cobalt alloys, 7 219-226. See also Cobalt high temperature alloys for orthopedic devices, 3 728 selenium and metallurgy of, 22 98 Cobalt alloy T-800, 7 223 properties, 7 223t CobaltCII) aluminate, uses, 7 241t Cobalt aluminate blue spinel, formula and DCMA number, 7 348t Cobalt Aluminate Blue, pigment for plastics, 7 370t... 

Cobalt ahiminate blue Cobalt aluminate blue spinel Cobalt aluminate spinel. See Cobalt aluminum oxide... 

Synonyms Cl 77346 Cobalt aluminate blue Cobalt aluminate blue spinel ... 

This body has devised a scheme for the classification of pigments, based on the chemical and structural identity of the colouring substance. It excludes single metal oxides and non-oxide pigments (q.v.) but includes all mixed metal oxides in one of 14 crystal classes and over 50 pigment categories, each having a specific DCMA Number (E.g. Crystal class XIII is spinel and DCMA No 13-26-2 refers to cobalt aluminate blue spinel. 

Combinations of cobalt(II) oxide and aluminum oxide in the spinel stoichiometry give cobalt aluminate blue spinels, C0AI2O4, C.I. Pigment Blue 28. Variations of this pigment include modification by zinc (C.I. Pigment Blue 72), magnesium, titanium, and lithium oxides. If lithium and titanium modifiers are added, a turquoise blue pigment is obtained. 

Fe, Co, Ni. This provides a range of colours in which the excellent durability characteristics of the host crystal structures are retained. An important commercial example of a mixed oxide pigment based on the spinel lattice is cobalt aluminate blue (Cl Pigment Blue 28), which is usually represented as C0AI2O4,... 

Cobalt aluminate spinel Cobalt blue Pigment blue 28 Thenard s blue Empirical AI2C0O,... 

CICPs that contain aluminum oxide, AI2O3, or alumina as a colorless base oxide are called aluminates. These almost always employ cobalt(II) oxide, CoO, as one of the coloring oxides. All of these pigments adopt the spinel crystal structure, and all have color hues in the blue to teal range. 

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