N-ZK7 by Schott

Obsolete Unknown Environmentally Friendly

N-ZK7 by Schott is an obsolete optical glass. It transmits from 0.30 to 2.50 µm with an nd of 1.50847 and a Vd of 61.19. It has low thermal expansion (CTE of 4.5×10⁻⁶/K) and good chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–2.500 µm
Optical Properties
Refractive Index (nd) 1.50847
Abbe Number (Vd) 61.19
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.07715\,\lambda^2}{\lambda^2 - 0.00676602} + \frac{0.168079\,\lambda^2}{\lambda^2 - 0.0230643} + \frac{0.85189\,\lambda^2}{\lambda^2 - 89.0499}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 4.5
TCE 100/300°C (10-6/K) 5.2
Thermal Conductivity (W/mK) 1.04
Heat Capacity (J/gK) 0.77
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.15 \times 10^{-5} + 2(1.73 \times 10^{-8})\,\Delta T + 3(-8.06 \times 10^{-11})\,\Delta T^2 + \frac{4.32 \times 10^{-7} + 2(7.05 \times 10^{-10})\,\Delta T}{\lambda - 0.179}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.49
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) 70.0
Poisson's Ratio 0.21
Knoop Hardness (kgf/mm²) 530.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 2
Alkali Resistance 1
Phosphate Resistance 2
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
ZNC7 Hoya 1.508471 61.266087
K4A CDGM 1.50802 61.052897
K7 Sumita 1.51112 60.5
C7 Hoya 1.511122 60.485929
NSL7 Ohara 1.511121 60.485793
H-K6 CDGM 1.511125 60.478905
B11-60 Corning 1.510999 60.383147
H-K7 CDGM 1.51478 60.634896
K11 Sumita 1.50013 61.6
B19-61 Corning 1.519061 61.386004
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
ZKN7 Schott 1.508469 61.187789
N-ZK7A Schott 1.508054 61.04
K7HT Schott 1.511144 60.466081
K7 Schott 1.51112 60.41
K11 Schott 1.50013 61.438579
AF32ECO Schott 1.511531 62.574031
BALKN3 Schott 1.518489 60.259571
UK50 Schott 1.522571 60.383109
K50 Schott 1.522572 60.179756
BK1 Schott 1.510091 63.464788
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