Phase Separation
This phenomenon is responsible for some of the most interesting glazes used in ceramics. A glaze without any visible phase separation can be seen on a sink or toilet, it can be considered a homogeneous glass. Phase separation occurs when a glass melt separates into two or more liquids of slightly different chemistry (and therefore potentially different firing appearance). This phenomena usually happens on the millimeter scale and where there is a catalyst (for example, the formation of crystals, the movement of a melt, the sudden melting of particles in the glaze melt into a glass of different fluidity, changes in reactivity around particles in the melt or released from the body below). Oxides that influence color and surface gloss or other visual characteristic can preferentially gather in one of the phases. Silky surfaced dolomite matte glazes are example of phase separation at many small sites, macro crystalline glazes are an example of it at many fewer much larger sites. Out Bound Links
- (Glossary)
Crystalline glazes
Crystals can form during cooling and solidificatio... - (Glossary)
Matte Glaze
A glaze that is not glossy. Of course, unmelted gl... - (Glossary)
Variegation, Reactive Glazes
Variegated or mottled glazes are those that do not... - (Recipes)
G2571A - Cone 10 Silky Magnesia Dolomite Matte
The beautifully silky surface and reliable glaze
2003-12-18 - A standard Plainsman Clays dolomite matte glaze us...
In Bound Links
Pictures
Micrograph of phase separation in a glaze
Example of variegation and phase separation with about 5% rutile added to a dolomite matte cone 10R glaze.
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