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CRYSTALLOGRAPHIC

Syngony Tetragonal

Symmetry Class 4/mmm

Lattice Constants, Angstrom a=4.64

c=3.06

Cleavability (100),(110), imperfect

OPTICAL

Refractive Index at ne for “o”-ray 1.3786

Refractive Index ne for “e”-ray 1.3904

Refractive Index at nF’-C’ for “o”-ray 0.0034

Refractive Index nF’-C’ for “e”-ray 0.0110

Thermal Coefficient of Refractive Index

at 3.39 microns for +/-60 deg C bo=(0.15...0.10) x 10-5

be=(0.10...0.04) x 10-5

Transmission Range, microns 0.13-7.0

THERMAL

Thermal Linear Expansion, deg C-1

for +/-60 deg C

^ to c-axis (6.23...9.25) x 10-6

|| to c-axis (10.86..14.54) x 10-6

Specific Heat Capacity, J/(kg•deg C) 0.9200 x 103

Melting Point, deg C 1255

MECHANICAL

Density, g/cm3 at 20 deg C 3.18

Mohs Hardness 6

Vickers Microhardness, Pa

^ to c-axis 441 x 107

|| to c-axis 289 x 107

Constants of Elastic Compliance, Pa-1 S11=12.45 x 10-12

S12=-7.16 x 10-12

S13=-1.66 x 10-12

S33 =5.94 x 10-12

S44=17.54 x 10-12

S66=10.53 x 10-12

Young Modulus (E), Pa

^ to c-axis 16.91 x 1010

|| to c-axis 7.97 x 1010

Shear Modulus (G), Pa

^ to c-axis 5.71 x 1010

|| to c-axis 9.52 x 1010

Poisson Ratio

|| to c-axis 0.577

CHEMICAL

Molecular Weight 62.32

Solubility

in water, gram/100 cm3 0.0076

in acids soluble

Leak Rate:                                    <2x10(-10) atm cc/sec He  

Parallelism:                                  <3 Arc Minutes

Flange Material:                           304/316 Stn. Stl.

Flatness:                                       l /4@ 632nm Transmitted Wavefront

Surface Finish:                             20/10 Scratch/Dig                              

Thermal Range:                            -100 to 200oC                           

Operating Conditions  

The thermal ratings specified are safe operating limits determined by various factors including

material properties, mechanical design, and the intended operating environment. Temperature

ratings for various mounting options may reduce the operating range of a window assembly.

All assemblies have a maximum thermal gradient of 25ºC per minute and may be damaged if

this limit is exceeded.

Refr. Index n vs. Wavelength l

     WAVELENGTH,            REFRACTIVE INDEX

   MICRONS                    no           ne

        0.2                      1.4231       1.4367

        0.5                      1.3797       1.3916

        1.0                      1.3736       1.3852

        2.0                      1.3686       1.3797

        3.0                      1.3618       1.3724

        4.0                      1.3525       1.3622

        5.0                      1.3400       1.3487

        6.0                      1.3242       1.3315

        7.0                      1.3044       1.3101

Internal Transmittance ti (l)

vs. Wavelength l

WAVELENGTH,                             INTERNAL

        MICRONS                              TRANSMITTANCE

0.2                                             0.95

0.5                                             0.97

1.0                                             0.97

3.0                                             0.97

5.0                                             0.97

6.0                                             0.91

7.0                                             0.54

8.0                                             0.12