[Clayart] role of P2O5 in ceramic glaze

paul gerhold gerholdclay at gmail.com
Thu Jan 16 16:29:35 EST 2020


This may  heresy but isn’t the empirical just pseudo science useful perhaps to functional potters but basically meaningless in terms of actually understanding what goes on in the glaze melt and glaze cooling and final structure of the glaze. 

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> On Jan 16, 2020, at 8:41 AM, carol at knighten.org wrote:
> 
> Hi
> 
> In response to Hank Murrows request for a discussion of the role of P2O5,
> potassium pentoxide in a glaze -
> 
> It is known to be a glass former, In their paper:
> 
> On the glass transition and viscosity of phosphorus pentoxide
> S. W. MartinC. A. Angell
> Cite this: J. Phys. Chem. 1986, 90, 25, 6736-6740
> Publication Date:December 1, 1986
> 
> There is no discussion of whether P2O5 is a glass former, i.e. that is
> accepted as known.  The purpose of that paper is rather to establish the glass
> transition temperature of P2O5.
> 
> In the book Silicate Glasses and Melts, B.O.Mysen and P Richet, Elsevie, 2005,
> in chapter 13 on phosphorus, give a discussion of the role of phosphorus
> in silicate melts, evidence is given that phosphorus is found in tetrahedral
> coordination as part of the glassy network.
> 
> It would seem that P2O5 also is a glass former and in column three of the
> empirical formula.
> 
> Carol
> 
> -- 
> ============================
>    Carol Marians       
>    (541) 296-4528
>  carol at knighten.org 
> http://carol.knighten.org
> ============================
> 
> 


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