Rhodium Disk

Rhodium Disk combines outstanding corrosion resistance, high reflectivity, and excellent hardness, making it highly valued for applications requiring durability and optical performance. Its machined circular form is particularly suited to precision instruments, optical devices, and catalytic systems. Industries such as electronics, automotive, and optics use rhodium disks in electrical contacts, optical mirrors, and catalytic converters. Specific applications include reflective elements in scientific instruments, high-wear contact surfaces in electrical switches, and catalyst substrates for emission control systems. In research, rhodium disks are employed in studies of surface chemistry, thin-film growth, and catalytic efficiency. Their unique blend of mechanical robustness, optical properties, and chemical stability ensures ongoing use in high-performance technological systems.

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Tolerance

Properties

Reference & Citations

each

Tolerances

Disc

Thickness	>0.05mm	±10%
Thickness	<0.01mm	±25%
Thickness	0.01mm - 0.05mm	±15%

Material Properties for Precious Metals

Atomic Properties

Element	Value
Atomic number	45
Crystal structure	Face centred cubic
Electronic structure	Kr 4d⁸ 5s¹
Valences shown	2,3,4,5,6
Atomic weight( amu )	102.9055
Thermal neutron absorption cross-section( Barns )	150
Photo-electric work function( eV )	4.6
Atomic radius - Goldschmidt( nm )	0.134
Ionisation potential( No./eV )	1/ 7.46
Ionisation potential( No./eV )	3/ 31.1
Ionisation potential( No./eV )	2/ 18.1

Mechanical Properties

Element	Value
Material condition	Hard
Material condition	Soft
Poisson's ratio	0.26
Poisson's ratio	0.26
Bulk modulus( GPa )	276
Bulk modulus( GPa )	276
Tensile modulus( GPa )	379
Tensile modulus( GPa )	379
Hardness - Vickers( kgf mm⁻² )	300
Hardness - Vickers( kgf mm⁻² )	120
Tensile strength( MPa )	1380-2070
Tensile strength( MPa )	690-760
Yield strength( MPa )	69-275

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	4.7@20@20°C
Temperature coefficient( K⁻¹ )	0.0044@0-100°C
Thermal emf against Pt (cold 0C - hot 100C)( mV )	0.7

Physical Properties

Element	Value
Boiling point( C )	3727
Density( gcm⁻³ )	12.4@20°C

Thermal Properties

Element	Value
Melting point( C )	1965
Latent heat of evaporation( J g⁻¹ )	4800
Latent heat of fusion( J g⁻¹ )	210
Specific heat( J K⁻¹ kg⁻¹ )	244@25°C
Thermal conductivity( W m⁻¹ K⁻¹ )	150@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	8.5@0-100°C