Effects of cooling interval and MnO2, TiO2, CdO, NiO additions on spheluritic willemite crystals

Macro crystal production in crystal glaze systems is a very important topic in ceramic art and science. In this study, crystal growth was obtained in two different firing regimes. Recipes were prepared by adding MnO, TiO, NiO and CdO into the frit. The first firing regime, which is used in artistic...

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Bibliographic Details
Published in:Journal of crystal growth 2017-01, Vol.458, p.115-119
Main Authors: Coşkun, Nihal Derin, Uz, Veli, Issi, Ali, Genç, Soner, Çakı, Münevver
Format: Article
Language:English
Subjects:
Additives
CdO
Ceramic glazes
Ceramics
Cooling
Cooling effects
Crystal Glaze
Crystal glazes
Crystal growth
Crystals
Firing
Frit
Manganese dioxide
MnO2
NiO Cooling Interval
Thermal analysis
TiO2
Titanium dioxide
Willemite
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Summary:Macro crystal production in crystal glaze systems is a very important topic in ceramic art and science. In this study, crystal growth was obtained in two different firing regimes. Recipes were prepared by adding MnO, TiO, NiO and CdO into the frit. The first firing regime, which is used in artistic ceramics, has a 100°C cooling temperature interval. The second regime that has a 580°C cooling temperature interval, was determined by DTA analysis. Then, the development of crystals was compared between these two firing regimes. According to the results, spheluritic willemite crystals up to three cm in the glazes doped MnO2 have been obtained by cooling it in a wide cooling interval. Larger willemite crystals were not formed in the narrow cooling temperature interval. It was determined that larger crystals can be produced by cooling at wide cooling temperature intervals and holding at lower temperature which involves nucleating the temperature of the crystal. •Heating and cooling temperatures should be determined by thermal analysis for crystal growth.•A wider subcooling interval is effective in larger willemite crystal growth.•Manganese provides a greater acicular willemite crystal growth.•Titanium, nickel and cadmium act as nucleating agents in willemite crystals.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2016.10.079