Indium

Physical Properties:

Symbol: In

Atomic Number: 49

Atomic Weight: 114.82 gm

Crystal Structure: Face-centered tetragonal

Density:    7.30 g/cm³ at 20 ^oC (68 ^oF)

                  7.026 g/cm³ at 164 ^oC

                  7.001 g/cm³ at 194 ^oC

                  6.974 g/cm³ at 228 ^oC

                  6.939 g/cm³ at 271 ^oC

                  6.916 g/cm³ at 300 ^oC

Thermal Properties

Melting Point: 156.61 ^oC

Boiling Point: 2080 ^oC

Latent Heat of Fusion: 28.47 kJ/kg

Latent Heat of Vaporization: 1959.42 kJ/kg

Thermal Conductivity: 83.7 W/m ⋅ K at 0 ^oC

Linear Coefficient of Thermal Expansion: 24.8 µm/m ⋅ K at 20 ^oC

Vapor Pressure:  1215 ^oC               0.1013 kPa

                             1421 ^oC                1.013 kPa

                             1693 ^oC                10.13 kPa

                             2080 ^oC               101.3 kPa

Electrical Properties:

Electrochemical Equivalent: Valence 3, 396.4µg/C

Electrode Potential: In^o ➞ In³⁺ + 3e, 0.38 V

Electrical Resistivity:      ^oC                            nΩ ⋅ m

                                  -269.77 (3.38 K)          Super conducting:

                                         20                                 84

                                        154                                291

                                        181                                301

                                        222                                319

                                        280                                348

Magnetic Properties:

Magnetic Susceptibility (Volumetric): 7.0 x 10^-6 mks

Magnetism: Diamagnetic

Mechanical Properties:

Tensile Strength: 380 to 515 psi

Compressive Strength: 310 psi (True compressive stress at 10% true stain)

Poisson's Ratio (at 20 ^oC):    Plane           Value

                                               (110)            1.337

                                               (100)            0.673

                                               (001)            0.486

Elongation (% in 1"): 22 to 41

Brindle Hardness: 0.9 tp 1.0

Reduction in Area (%): 85

Modulus of Elasticity: 1,570,000 psi

Speed of Sound (21.1 ^oC): 2504 m/sec

Solidification Shrinkage: 2.5%

Specific Heat (cal/g/^oC) Solid at 20 ^oC: 0.065

Specific Volume (cc/g) at 20 ^oC: 0.136

Surface Tension (170 ^oC - 250 ^oC): 340 dyness/cm/^oC

Surface Tension at MP: 513; 599 dyness/cm

Valence: 3 also 2 and 1

 

Nuclear Properties:

Stable Isotopes: 113, 115

Thermal Neutron Cross Section (2200 m/s) :

Absorption (barns):           190 ± 10

Scattering (barns):            2.2 ± 0.5