AMTIR

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The acronym AMTIR represents English amorphous material Transmitting infrared radiation (dt. Infrared radiation -passing amorphous material ) and referred to originally one element selected from germanium (33%), arsenic (12%) and selenium (55%) composite chalkogenes glass .

Properties and areas of application

AMTIR (more precisely AMTIR-1) is an amorphous material which is insoluble in water and dilute acids. Because of this insolubility , it is often classified as non-toxic, even if some components are toxic, e.g. B. arsenic, this must be taken into account especially during manufacture. The material is resistant to sulfuric and sulfonic acids , but dissolves in concentrated alkaline solutions and oxidizing acids such as nitric acid .

All AMTIR materials are generally characterized by a very low absorption coefficient in the infrared spectral range or parts thereof - these spectral ranges are referred to as the transmission range and differ depending on their composition.

Due to their high brittleness , the favorable refractive index in the range from 2.4 to 2.7 and their insolubility in water, AMTIR glasses are very suitable as reflective elements for ATR spectroscopy in the mid-infrared range. AMTIR has a similar refractive index and comparable hardness to zinc selenide and can therefore be used as an alternative where zinc selenide cannot be used, for example for measuring strong acids. Due to its resistance to erosion in flowing currents, it is also suitable for in- process control .

Optical properties
designation average composition Refractive index Transmission range Temperature coefficient of
the refractive index
d n / d T in 10 −6 K −1 		comment
AMTIR-1 Ge 33 As 12 Se 55 2.5146 @ 4 µm
2.4981 @ 10 µm		 0.7-12.0 µm 86 @ 3.4 µm
72 @ 10 µm
AMTIR-2 As x Se x 2.7760 @ 4 µm
2.7613 @ 10 µm		 1.0-14.0 µm 31 @ 4 µm
5 @ 10 µm
AMTIR-3 Ge x Sb x Se x 2.6216 @ 4 µm
2.6027 @ 10 µm		 1.0-12.0 µm 98 @ 3 µm
91 @ 10 µm
AMTIR-4 As x Se x 2.6543 @ 4 µm
2.6431 @ 10 µm		 1.0-12.0 µm −24 @ 3 µm
−23 @ 10 µm
AMTIR-5 As x Se x 2.7545 @ 4 µm
2.7398 @ 10 µm		 1.0-12.0 µm <1 @ 4 µm
<1 @ 10 µm
AMTIR-6 As 2 S 3 2.4107 @ 4 µm
N / A @ 10 µm		 0.6-8 µm <1 @ 5 µm
N / A @ 10 µm

Manufacturer

Infrared transparent glasses based on germanium, selenium and antimony or arsenic were developed by Texas Instruments as early as the 1970s under the names TI 1173 and TI 20. These glasses have been marketed by the TI subsidiary Amorphous Materials under the names AMTIR-1 (TI 20) and AMTIR-3 (TI 1173) since 1977 . Similar materials have been offered by other companies over the past few decades, including Barr and Stroud (England, BS1, BS2 and BSA) and the Jenaer Glaswerke (IG 2n2919, IG 32930, IG 41921, IG-51922 and IG-61923).

Individual evidence

  1. ^ A b c Francis M. Mirabella: Internal Reflection Spectroscopy: Theory and Applications . CRC Press, 1992, ISBN 0-8247-8730-7 , pp. 105 .
  2. ↑ a b Michael Schaub, Jim Schwiegerling, Eric Fest, R. Hamilton Shepard, Alan Symmons: Molded Optics: Design and Manufacture . CRC Press, 2011, ISBN 978-1-4398-3258-5 , pp. 212–214 ( limited preview in Google Book search).
  3. ^ A b c Valentina F. Kokorina: Glasses for Infrared Optics . CRC Press, 1996, ISBN 978-0-8493-3785-7 , pp. 188 ( limited preview in Google Book search).
  4. ↑ Jacob Fraden: Handbook of Modern Sensors: Physics, Designs, and Applications . Springer, 2010, ISBN 978-1-4419-6466-3 , pp. 620 ( limited preview in Google Book search).
  5. ↑ Comparison of IR Materials (Version 4). Amorphous Materials Inc., accessed October 17, 2013 .
  6. ↑ AMTIR-1. Amorphous Materials Inc., accessed October 17, 2013 .
  7. ↑ AMTIR-3 is also described in many sources with the composition Ge 28 As 12 Se 60 , especially when the alternative designation TI 1173 is given. See Valentina F. Kokorina: Glasses for Infrared Optics . CRC Press, 1996, ISBN 978-0-8493-3785-7 , pp. 188 ( limited preview in Google Book search).
  8. ↑ AMTIR-6. Amorphous Materials Inc., accessed October 17, 2013 .