Cobalt green
Names | |
---|---|
Other names cinnabar green, turquoise green, Rinman's green, Rinmann's green, zinc green | |
Identifiers | |
Properties | |
Chemical formula | Zn1−xCoxO |
Solubility in water | Insoluble |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references |
Cobalt green is an ambiguous term for either of two families of green inorganic pigments. Both are obtained by doping cobalt(II) oxide into colorless host oxides.
Spinel-based cobalt green
Doping Co(II) into Mg(II) and Zn(II) sites of Mg2TiO4 and Zn2TiO4, respectively gives one family of cobalt greens. These materials adopt the spinel structure.[1]
Rinman's green
Rinman's green, also referred to as Rinmann's green, is obtained by doping cobalt(II) oxide into zinc oxide. Sven Rinman, a Swedish chemist, discovered this compound in 1780. Zinc oxide–derived pigments have been used in many industries and processes. It is rarely used because it is a weak chromophore and relatively expensive compared to chromium(III) oxide.
The structure and color of compositions Zn1−xCoxO depends on the value of x. For x ≤ 0.3, the material adopts the Wurzite structure (of ZnO) and is intensely green. For x ≥ 0.7, the material has the sodium chloride structure (of CoO) and is pink. Intermediate values of x give a mixture of the two phases.[2]
Cobalt green has been tested for use in "spintronic" devices. Cobalt green is attractive in this application because it is magnetic at room temperature.[3]
See also
- Cobalt blue
- List of inorganic pigments
References
- ^ Völz, Hans G. et al. "Pigments, Inorganic" in Ullmann's Encyclopedia of Industrial Chemistry, 2006 Wiley-VCH, Weinheim. doi:10.1002/14356007.a20_243.pub2.
- ^ F. Wagenknecht, and R. Juza "Rinmann's Green" in Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1092.
- ^ Djerdj, Igor; Jaglicic, Zvonko; Arcon, Denis; Niederberger, Markus (2010). "Co-Doped ZnO nanoparticles: Minireview". Nanoscale. 2 (7): 1096–1104. Bibcode:2010Nanos...2.1096D. doi:10.1039/c0nr00148a. PMID 20648333.
External links
- Pigments through the Ages
- v
- t
- e
- HCo(CO)4
- CoBr2
- Co(CN)2
- CoCO3
- CoC2O4
- CoCl2
- Co(ClO3)2
- Co(ClO4)2
- CoF2
- Co(HCO2)2
- CoI2
- Co(NO3)2
- Co3(PO4)2
- Co(OAc)2
- CoGeO3
- CoO
- Co(OH)2
- CoS
- Co(OCN)2
- Co(SCN)2
- CoSO4
- CoSe
- Co3P2
- CoH2
- Co(C3H6O3)2
- C
24H
48CoO
4 - C
36H
70CoO
4
- CoSi
- CoGe
- Co3O4
- CoAs
- CoCl3
- Co(NO3)3
- Co2O3
- CoF3
- Co(OH)3
- LiCoO2
- NaxCoO2
- CoF4
- Cs2CoF6
- CoC28H44
- Na3CoO4