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Infrared‐Transmitting Glasses in the System K 2 O‐Sb 2 O 3 ‐Sb 2 S 3
Author(s) -
KING BURNHAM W.,
KELLY GEORGE D.
Publication year - 1958
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1958.tb12935.x
Subject(s) - antimony , potassium , antimony oxide , mineralogy , analytical chemistry (journal) , knoop hardness test , materials science , potassium hydroxide , chemistry , inorganic chemistry , oxide , indentation hardness , metallurgy , microstructure , organic chemistry
Glasses were discovered in the system K 2 O‐Sb 2 O 3 b 3 Raw materials used in the preparation of these glasses were potassium pyroantimonate, potassium hydroxide, potassium nitrate, antimony oxide, and antimony trisulfide. Details of the methods of preparing the glasses and the compositions investigated are given. A glass, prepared by melting a mixture of potassium pyroantimonate and antimony trisulfide in air, was investigated in some detail. It was found to have an average infrared transmission of 42% in the range 2 to 7 μ. The glass annealed at about 150°C. and softened at about 230°C. Its coefficient of linear thermal expansion, in the range 240° to 200°C., was 20 × 10 −6 per °C. The glass had a specific gravity of 3.94, a modulus of elasticity of about 5 × 10 6 lb. per sq. in., a Knoop hardness of about 135, and was highly resistant to attack by atmospheric moisture.