URL: The collected writings of Hermann August Seger - Internet Archive
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https://archive.org/details/gri_33125001394697/mode/2up
The “Seger Formula” was not introduced in one single paper with that title. Rather, it emerged gradually through Hermann Seger’s technical writings on glaze chemistry and ceramic analysis during the 1870s–1880s, and was later consolidated in his collected works. Modern ceramic texts later called it the “Seger Formula” or “Seger Unity Formula.”
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The Seger Unity Formula
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Ceramic material powders can be crystalline or amorphous (or a combination), and they can be natural or man-made, and they can have very different particle physics. Ceramic materials are classic case studies of the sciences of solid state physics and solid state chemistry. Mineral sources of oxides impose their own melting patterns - when one is substituted for another, to supply an oxide, a different system with its own relative chemistry is entered. An extreme example of this is sourcing Al2O3 to a glaze using calcined alumina instead of kaolin. Although the chemical formula of the glaze may remain unchanged, the fired result would be completely different. This is because very little of the alumina would dissolve into the glaze melt. At the opposite extreme, a different frit could be used to supply a set of oxides (while maintaining the overall chemistry of the glaze), and the fired result would be much more chemically predictable. Why? Because they readily release their oxides to the melt.
Links
| Articles |
Glaze Chemistry Basics - Formula, Analysis, Mole%, Unity
Part of changing your viewpoint of glazes, from a collection of materials to a collection of oxides, is learning what a formula and analysis are, how conversion between the two is done and how unity and LOI impact this. |
| Articles |
What is a Mole, Checking Out the Mole
An overview of the meaning of this unit for measuring quantities of molecules by Joseph Herbert and Tom Buck. |
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