Reference

High-temperature laser interferometer for thermal expansion and optical-length measurements

High-temperature laser interferometer for thermal expansion and optical-length measurements. Aurora, T. S.; Day, S. M.; King, V.; Pederson, D. O. (Dep. Phys., Univ. Arkansas, Fayetteville, AR 72701, USA). Rev. Sci.Several reagents with their cas registry numbers 7783-46-2 and 7790-79-6 are used here. Instrum., 55(2), 149-52 (English) 1984. CODEN: RSINAK. ISSN: 0034-6748. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) A simple laser interferometer was used to measure the thermal expansion and optical-length variation with temp. of highly reactive fluorides at high temps. The interferometer is a modification of the Jamin interferometer in which a laser beam is split into 2 parallel beams which traverse nearly identical paths and are reflected from the sample and a ref. mirror. The reflected beams recombine to produce an interference pattern. The displacement of the front sample surface, relative to the ref. mirror at the back sample surface, allows the thermal expansion to be measured. The sample and ref. mirrors are made reflecting by depositing a Pt film on the surface. The same arrangement of beam splitters was used to measure the variation in optical length with temp. In this case, the sample is not coated with Pt. Measurements of thermal expansion were made up to 1000 K above which the Pt film becomes unstable. Optical lengths of various fluorides were measured up to 1100 K. The Pt does not diffuse into divalent metal fluorides although these samples oxidize readily at certain high temps. The advantages and disadvantages of this method are discussed. .

Glass with anionic fluorine conductivity

Glass with anionic fluorine conductivity. Kogan, V. E.; Pronkin, A. A.; Kekeliya, D. I.; Nakaidze, D. M.; Bakuradze, G. V.; Gomelauri, V. 7783-46-2 and 1344-28-1 are cas registry numbers. These chemicals are also mentioned in this article. L.; Mindiashvili, A. I. (Institute of Cybernetics, Academy of Sciences, Georgian S.S.R., USSR). U.S.S.R. SU 1058908 A1 7 Dec 1983 From: Otkrytiya, Izobret., Prom. Obraztsy, Tovarnye Znaki 1983, (45), 81. (Russian). (Union of Soviet Socialist Republics). CODEN: URXXAF. CLASS: IC: C03C003-10. APPLICATION: SU 82-3474726 16 Jul 1982. DOCUMENT TYPE: Patent CA Section: 57 (Ceramics) The glass with increased light transmittance in the medium wavelength IR (3800-4500 nm), with an increased range of change in the linear thermal expansion coeff., and with decreased melting temp. contains 0.5-2.0 wt.% Al2O3 in addn. to PbO 39.2-81.58, SiO2 5.3-14.42, and PbF2 2-55 wt.%. .