Tellurium-based sulfur series infrared glass and preparation method thereof

Abstract

The invention discloses tellurium-based sulfur series infrared glass. The glass comprises the following components: 10 to 20 mole percent of In2Te6, 45 to 80 mole percent of GeTe 4 and 5 to 40 mole percent of AgX, wherein the total mole percentage of all components is 100 percent; X is Cl or Br or I; the transition temperature (Tg) of the glass is between 170 and 200 DEG C; the thermal stability temperature (delta T) of the glass is between 100 and 120 DEG C; the thickness of the glass is no more than 1.4 millimeters; and a cut-off edge through which an infrared band can pass is up to 25 mu m. The glass has an appropriate transition temperature, and high thermal stability, reduces the base frequency molecular vibration of the glass due to the adoption of a heaviest element in a sulfur group, namely, tellurium and reduces the phonon energy of the glass. Simultaneously, the thickness of the glass is controlled to be no more than 1.4 millimeters so that the influence of multi-phonon absorption is reduced, the cut-off edge, through which the infrared band can pass, of the tellurium-based sulfur series infrared glass is enhanced and can reach 25 mu m, substances with long far infrared wavelengths can be absorbed and spectrum detection space is expanded. The glass preparation method has the advantages of simple process, high glass forming capability, no corrosion, easy operation, short processing period and high efficiency.

Description

technical field [0001] The invention relates to an infrared glass material, in particular to a tellurium-based chalcogenide infrared glass and a preparation method thereof. Background technique [0002] Infrared glass materials, whose spectral range is 6-25μm, are used in infrared spectrum technology and biosensing technology. Infrared spectrum technology is one of the main techniques for molecular and structural identification of organic and inorganic compounds, such as H 2 O at 6μm, O 3 at 9 μm and CO 2 The spectral absorption peak is caused at 16 μm, so the zero position interferometer of the European Space Agency's Darwin project uses infrared glass materials (6-18 μm spectral region). Biosensing technology is to identify compounds and detect biological tissues by comparing with standard spectra of infrared spectroscopy. Infrared glass materials can be divided into mid-infrared glass (6-13 μm) and far-infrared glass (14-25 μm) according to the spectral region. NASA e...

AI Technical Summary

Problems solved by technology

Therefore, the infrared transmission wavelength of the current infrared glass material is relatively short, and the cut-off edge of the infrared transmission band cannot reach 25 μm, so that the available spectral range of far-infrared spectrum detection and biosensing technologies is narrow, and the problem of multi-phonon absorption has a greater impact , it is difficult to meet the ever-changing technical requirements in the fields of infrared sensing, life detection, military remote sensing and far-infrared space

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