氯化钠 Sodium Chloride (NaCl)

Syngony

Cubic

Symmetry Class

m3m

Lattice Constants

a = 5.640 Å

c = a

Cleavability

(100), perfect

Refractive Index at n_e

1.5467

Refractive Index at n_F' - n_C'

0.0132

Refractive Index at n_10.6

1.4906

Refractive Index at n_8.0 - n_12.5

0.0308

Thermal Coefficient of Refractive Index at 3.39 microns for

±60 ℃

(-3.31) ... (-3.73) x 10^-5

Transmission Range, microns

0.2 - 20

Thermal Linear Expansion,

℃^-1 for ±60 ℃

(36.4 ... 40.8) x 10^-6

Thermal Conductivity, W/(m * ℃) at 35 ℃

6.15

Specific Heat Capacity, J/(kg * ℃)

0.871 x 10³

Melting Point, ℃

801

Density, g/cm³ at 20 ℃

2.17

Mohs Hardness

3

Vickers Microhardness, Pa

20 x 10⁷

Constants of Elastic Compliance,

Pa-1

S₁₁ = 22.85 x 10^-12 S₁₂ = -4.69 x 10^-12

S₄₄ = 78.34 x 10^-12

Young Modulus (E), Pa

in <100> direction

4.37 x 10¹⁰

in <111> direction

3.27 x 10¹⁰

Shear Modulus (G), Pa

in <100> direction

1.59 x 10¹⁰

in <111> direction

1.28 x 10¹⁰

Poisson Ratio

0.203

Molecular Weight

58.45

Solubility

in water, gram/100cm³

35.7

in acids

soluble

Wavelength, Microns

Refractive Index

0.2

1.7899

0.5

1.5516

1.0

1.5320

2.0

1.5254

3.0

1.5242

4.0

1.5217

5.0

1.5185

6.0

1.5153

7.0

1.5112

8.0

1.5066

9.0

1.5009

10.0

1.4947

11.0

1.4878

12.0

1.4800

12.5

1.4758

15.0

1.4403

20.0

1.3822

30.0

1.0912

Wavelength, Microns

Internal Transmittance

0.2

0.16

0.5

0.97

1.0

0.97

3.0

0.98

5.0

0.98

6.0

0.98

7.0

0.98

8.0

0.98

9.0

0.98

10.0

0.98

12.0

0.98

15.0

0.87

20.0

0.05