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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).
  3. A comparison of the emissivity in vacuo of barium fluoride, magnesium fluoride, and calcium fluoride with an optical pyrometer established a lowerlimit 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-S1, pp. 16–17 (1961).

Duncanson, A.

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

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).

Other (6)

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

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

A comparison of the emissivity in vacuo of barium fluoride, magnesium fluoride, and calcium fluoride with an optical pyrometer established a lowerlimit 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-S1, pp. 16–17 (1961).

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