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  1. Commercially available: Semi-Elements Inc., Saxonburg Blvd., Saxonburg, Pennsylvania.
  2. A. Duncanson and R. W. H. Stevenson, Proc. Phys. Soc. (London) 72, 1001 (1958).
    [CrossRef]
  3. A comparison of the emissivity in vacuo of barium fluoride, magnesium fluoride, and calcium fluoride with an optical pyrometer established a lower limit of 1340°C for the melting point of the single crystal obtained from Semi-Elements, Inc. The magnesium fluoride, purified prior to growth of the colorless, transparent crystals by the Stockbarger method, was estimated at 99.95% by Joseph V. Fisher of Semi-Elements (private communication).
  4. Comparative Knoop hardness numbers for single-crystal magnesium fluoride and IRTRAN-1 under a 100-g load were 415 and 625, respectively. Private communication: James H. McMahon, U. S. Naval Ordnance Test Station, China Lake, California.
  5. Private communication: John Ransom Laboratories, Los Angeles, California.
  6. IRIA, State-of-the-Art Report, “Optical Materials for Infrared Instrumentation,” University of Michigan, No. 2389-11-Si, pp. 16–17 (1961).

1958 (1)

A. Duncanson and R. W. H. Stevenson, Proc. Phys. Soc. (London) 72, 1001 (1958).
[CrossRef]

Duncanson, A.

A. Duncanson and R. W. H. Stevenson, Proc. Phys. Soc. (London) 72, 1001 (1958).
[CrossRef]

McMahon, James H.

Comparative Knoop hardness numbers for single-crystal magnesium fluoride and IRTRAN-1 under a 100-g load were 415 and 625, respectively. Private communication: James H. McMahon, U. S. Naval Ordnance Test Station, China Lake, California.

Stevenson, R. W. H.

A. Duncanson and R. W. H. Stevenson, Proc. Phys. Soc. (London) 72, 1001 (1958).
[CrossRef]

Proc. Phys. Soc. (London) (1)

A. Duncanson and R. W. H. Stevenson, Proc. Phys. Soc. (London) 72, 1001 (1958).
[CrossRef]

Other (5)

A comparison of the emissivity in vacuo of barium fluoride, magnesium fluoride, and calcium fluoride with an optical pyrometer established a lower limit of 1340°C for the melting point of the single crystal obtained from Semi-Elements, Inc. The magnesium fluoride, purified prior to growth of the colorless, transparent crystals by the Stockbarger method, was estimated at 99.95% by Joseph V. Fisher of Semi-Elements (private communication).

Comparative Knoop hardness numbers for single-crystal magnesium fluoride and IRTRAN-1 under a 100-g load were 415 and 625, respectively. Private communication: James H. McMahon, U. S. Naval Ordnance Test Station, China Lake, California.

Private communication: John Ransom Laboratories, Los Angeles, California.

IRIA, State-of-the-Art Report, “Optical Materials for Infrared Instrumentation,” University of Michigan, No. 2389-11-Si, pp. 16–17 (1961).

Commercially available: Semi-Elements Inc., Saxonburg Blvd., Saxonburg, Pennsylvania.

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Figures (2)

Fig. 1
Fig. 1

Transtnittance of single-crystal magnesium fluoride and IRTRAN-1, obtained with a Cary 14 spectrometer; thicknesses = 0.110 in.

Fig. 2
Fig. 2

Transmittance of single-crystal magnesium fluoride and IRTRAN-1, obtained with a P–E 221 spectrometer; thicknesses = 0.110 in.