Rhodium (Rh) soft annealed (+A)

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Description

The silver-white, hard precious metal material rhodium (Rh) belongs to the light platinum metals (density around 12 g/cm³). Rh is resistant to acids in a compact form such as iridium, but it dissolves finely distributed in aqua regia and concentrated sulfuric acid. It reacts with oxygen at high surface temperature (in contrast, ruthenium and osmium form volatile oxides). The processability depends crucially on the degree of purity. Pure rhodium can be forged in red hot, can be rolled and pulled. The material is characterized by high thermal and electrical conductivity. Application: Rhodium has greater practical importance than the other platinum metals except platinum and palladium. In car exhaust catalysts, mainly Pt / Rh or Pt / Pd are used. Furthermore, rhodium is used in chemical and electrochemical apparatus engineering (crucible for growing single crystals for the optical industry and laser technology), for spinnerets and thermocouples (Pt / Rh). Rhodium layers have the advantage over all other platinum metal coatings of particularly high hardness, mechanical and chemical resistance and high reflectivity (for example, for silvering). Furthermore, Rh is also used as a contact material and for heating coils and mirrors. Rhodium is sufficiently ductile, corrosion resistant, oxidation resistant up to 800°C, abrasion resistant. It is limited machinable, electrodepositable and can be separated from the gas phase.

Related Standards

This material data has been provided by WIAM.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

PropertyTemperatureValue

Density

20.0 °C

12.4 g/cm³

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Mechanical

PropertyTemperatureValue

Elastic modulus

-190.0 °C

405 GPa

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20.0 °C

380 - 386 GPa

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200.0 °C

368 GPa

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400.0 °C

346 GPa

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500.0 °C

336 GPa

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600.0 °C

325 GPa

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700.0 °C

315 GPa

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800.0 °C

304 GPa

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900.0 °C

291 GPa

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Elongation

20.0 °C

9 %

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Hardness, Vickers

20.0 °C

120 - 410 [-]

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Poisson's ratio

20.0 °C

0.26 [-]

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Shear modulus

20.0 °C

150 - 153 GPa

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Tensile strength

-196.0 °C

879 MPa

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20.0 °C

690 - 800 MPa

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25.0 °C

720 MPa

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250.0 °C

622 MPa

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500.0 °C

343 MPa

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750.0 °C

119 MPa

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1000.0 °C

86 MPa

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Yield strength

-196.0 °C

65 MPa

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20.0 °C

68 MPa

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25.0 °C

50 MPa

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250.0 °C

76 MPa

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500.0 °C

59 MPa

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750.0 °C

24 MPa

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1000.0 °C

25 MPa

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Yield strength Rp0.2

-196.0 °C

94 MPa

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20.0 °C

69 - 270 MPa

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25.0 °C

68 MPa

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250.0 °C

97 MPa

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500.0 °C

77 MPa

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750.0 °C

41 MPa

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1000.0 °C

35 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

50.0 °C

8E-6 1/K

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100.0 °C

8.5E-6 1/K

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200.0 °C

9E-6 1/K

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300.0 °C

9.3E-6 1/K

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400.0 °C

9.6E-6 1/K

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500.0 °C

9.8E-6 1/K

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600.0 °C

1E-5 1/K

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700.0 °C

1.01E-5 1/K

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800.0 °C

1.03E-5 1/K

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900.0 °C

1.05E-5 1/K

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1000.0 °C

1.08E-5 1/K

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1100.0 °C

1.1E-5 1/K

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1200.0 °C

1.13E-5 1/K

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1300.0 °C

1.15E-5 1/K

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1400.0 °C

1.18E-5 1/K

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1500.0 °C

1.21E-5 1/K

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Melting point

1963 °C

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Typical for Rhodium

Specific heat capacity

23.0 °C

254 J/(kg·K)

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Typical for Rhodium

Thermal conductivity

-173.0 °C

185 W/(m·K)

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-73.0 °C

156 W/(m·K)

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20.0 °C

88 W/(m·K)

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127.0 °C

145 W/(m·K)

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327.0 °C

135 W/(m·K)

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527.0 °C

126 W/(m·K)

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727.0 °C

121 W/(m·K)

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927.0 °C

118 W/(m·K)

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1127.0 °C

115 W/(m·K)

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1327.0 °C

109 W/(m·K)

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1527.0 °C

106 W/(m·K)

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1727.0 °C

104 W/(m·K)

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Electrical

PropertyTemperatureValue

Electrical conductivity

20.0 °C

2.33E+7 S/m

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Electrical resistivity

20.0 °C

4.3E-8 Ω·m

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Chemical properties

PropertyValue

Rhodium

99.9 %

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