Infrared transmitting glasses with high glass transition temperatures
نویسنده
چکیده
A chalcogenide glass capable of infrared transmission which is either sulfur, selenium or tellurium based and consists of compositions of the formula MX+M.sub.2 'X.sub.3 +SiX.sub.2, wherein M is one of the metals calcium, strontium, barium, zinc and lead, and M' is either aluminum or gallium and X is either sulfur, selenium or tellurium. Aluminum or gallium chalcogenide acts to increase the covalent bonding network structure of the glass with the result being that excellent high temperature 8-14 micron IR transmitting glasses with transition temperatures above 500C are prepared. Disciplines Ceramic Materials This patent is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/patents/251 United States Patent [191 [11] Patent Number: 4,942,144 Martin [45] Date of Patent: Jul. 17, 1990 [54] INFRARED TRANSMI'ITING GLASSES 806837 12/1958 United Kingdom . WITH HIGH GLASS TRANSITION TEMPERATURES OTHER PUBLICATIONS _ . Hilton, Nonoxide Chalcogenide Glasses as Infrared Optic [75] Inventor' Steve w’ Mm’ Ames’ Iowa Materials, Applied Optics, vol. 5, No. 12, Dec. 1966. [73] Assignee: Iowa State University Research . . Foundation, Inc., Ames, Iowa pmium' Examn_zer_Mark L‘ Bell Assistant Examiner-Deborah Jones [21] Appl. No.: 300,580 Attorney, Agent, or Firm-Zarley, McKee, Thomte, [22] Filed: Jan. 23, 1989 v°°rhees 8‘ Sea“ [51] Int. c1; .............................................. .. cosc 3/32 [57] ABSTRACT [52] Cl. ..................................... .. 501/40; 501/904 A chalgogenide glass capable of infrared transmission [58] Field Of Search ................................ .. 501/ 40, 904 which is either Sulfur, Selenium 01' tellurium based and [56] References Cited consists of compositions of the formula U.S. PATENT DOCUMENTS 2,883,291 4/1959 3,188,216 6/1965 3,841,739 10/1975 4,492,763 I/ 1985 4,557,914 12/1985 .. 4,612,294 9/1986 Katsuyama et a1. ................ .. 501/40 FOREIGN PATENT DOCUMENTS 60-226427 11/1985 Japan . MX+M2’X3+SiX2, wherein M is one of the metals calcium, strontium, barium, zinc and lead, and M’ is either aluminum or gallium and X is either sulfur, sele nium or tellurium. Aluminum or gallium chalcogenidc acts to increase the covalent bonding network structure of the glass with the result being that excellent high temperature 8-14 micron IR transmitting glasses with transition temperatures above 500° C. are prepared. 7 Claims, 1 Drawing Sheet US. Patent Jul. 17, 1990 4,942,144
منابع مشابه
A NEW GENERATION OF OXYNITRIDE GLASSES CONTAINING FLUORINE
Oxynitride glasses are found as grain boundary phases in silicon nitride ceramics. They are effectively alumino-silicate glasses in which nitrogen substitutes for oxygen in the glass network, and this causes increases in glass transition and softening temperatures, viscosities (by two to three orders of magnitude), elastic moduli and microhardness. Calcium silicate-based glasses containing fluo...
متن کامل2.7 μm emission of high thermally and chemically durable glasses based on AlF3
AlF3-based glasses (AlF3-YF3-CaF2-BaF2-SrF2-MgF2) with enhanced thermal and chemical stability were synthesized and compared with the well-known fluorozirconate glass (ZBLAN). The 2.7 μm mid-infrared emission in the AlF3-based glasses was also investigated through the absorption and emission spectra. Both the temperature of glass transition and the characteristic temperatures (ΔT, Hr, k(gl)) of...
متن کامل“Study of stable gallium oxide heavey metal Ga2O3-Bi2O3-PbO system glasses proposed as a base for optically noble glazes and enamels”
Ultra optical glasses are proposed for attaining noble glazes of high reflection and shine. In addition, these glasses can be used as semi-mirrors and optical instruments. In this reseach attempts were devoted mainly to introduce a glass system with the highest possible refractive index in which the highest reflection is desirable. Thus different amounts of heavy metal oxides modifiers, such as...
متن کاملMicrostructure, mechanical and thermal properties of chalcogenide glasses and glass-ceramics based on Se-As-Ge system nucleated by Sn
In particular, chalcogenide glasses and glass-ceramics are new materials that exhibit good transparency in infrared region (0.8-12µm). We can overcome the main weakness of these glasses by improving the hardness through controlling crystallization. In this paper, we report results of a study on chalcogenide glasses in the ternary system of As-Se-Ge with nominal composition of Snx (Se...
متن کاملPlanar waveguide obtained by burying a Ge22As(20Se58 fiber in As2S3 glass.
We demonstrate the possibility of fabricating an infrared transmitting waveguide by burying fiber in chalcogenide glasses. Two highly mature chalcogenide glasses are used for these experiments. GASIR glass from Umicore IR Glass, Olen, Belgium, with the composition of Ge(22)As(20)Se(58) is used to draw fibers that are then buried in an As(2)S(3) glass substrate. The glasses we used are compatibl...
متن کامل