Home

Login to enhance your shopping experience.

Login or Create an Account
Main Menu
Categories
1916-2016

Potassium sulfate droplets and the origin of turbidity in alabaster glasses V47 015-018

Potassium sulfate droplets and the origin of turbidity in alabaster glasses V47 015-018

A study of the criteria required to manufacture multicomponent semi-transparent silicate glasses, so called ‘alabaster’glasses, has found that the optical effect is caused by noncrystalline potassium sulfate droplets. The droplets were characterised by use of XRD, SEM/EDX and Raman spectroscopy. The size range of the particles is of the order of 5–50 micrometers. It was found that the droplets consisted of potassium sulfate, even if other sulfate compounds were addedto the glass. The amount of sulfate compound added, the melting temperature of the furnace and the melting time have significant effects on the optical density of the glass. The optical density of the glass can be correlated to the calculated surface tension of the host glass, suggesting that phase separation of a sulfate enriched liquid phase is part of the mechanism forming the droplets. By adding pigments several different colours can be obtained, but the alabaster effect is not achieved during reducing conditions, thus it seems not possible to produce colours originating from reduced pigments.Pigments tested were Cr, Fe, Co, Cu, Au, Mo/Se, Nd and Ti/Ce/Se.

Price:

£ 15.00

 

All required fields are marked with a star (*). Click the 'Add To Cart' or 'Add To Wish List' button at the bottom of this form to proceed.

Item Quantity

Enter the appropriate quantity for this item below.

Account Menu
Quick Store Search

Advanced Search
Shopping Cart

There are no items in your shopping cart.