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Indium
Indium (In) is a soft, malleable post-transition metal with a bright silvery luster, commonly used in electronics, materials research, and semiconductor technologies. It exhibits excellent wetting behavior and a low melting point, making it valuable in solder and sealing applications.
Goodfellow’s Indium product line includes Indium Disks, Indium Foils (Light Tight), and Indium Spooled Wire, essential for advanced research and industrial applications. Indium's unique properties, such as malleability and excellent thermal conductivity, make it indispensable in electronics, optics, and materials science. Researchers in laboratories and R&D sectors use Indium to develop advanced semiconductors, innovative display technologies, device prototypes, and efficient thermal interface materials. Our high-purity Indium products (from 99.8% to 99.99998%) enable advancements in nanotechnology, renewable energy systems, and next-generation electronic components, providing the precision and reliability required for cutting-edge scientific research and industrial development.
Properties
Identifiers
Isotopes
Applications
Grades
Synonyms
General Properties
| Property | Value |
|---|---|
| Atomic Number | 49 |
| Density | 7.31 g/cm³ |
| Melting Point | 156.6 °C |
| Boiling Point | 2072 °C |
| Thermal Conductivity | 81.6 W/m·K |
| Electrical Resistivity | 83.7 nΩ·m |
| Crystal Structure | Tetragonal |
Mechanical Properties
| Property | Value |
|---|---|
| Hardness | Mohs ~1.2 |
| Elastic Modulus | 11 GPa |
| Poisson’s Ratio | 0.45 |
Chemical Properties
| Property | Value |
|---|---|
| Corrosion Resistance | Forms protective oxide layer; stable in air |
| Reactivity | Slowly oxidizes in air; dissolves in acids |
| Oxidation States | +1, +3 (common: +3) |
| Surface Oxide | Indium(III) oxide (In₂O₃) |
| Identifier | Value |
|---|---|
| Symbol | In |
| Atomic Number | 49 |
| CAS Number | 7440-74-6 |
| UN Number | Not classified |
| EINECS Number | 231-180-0 |
| Isotope | Type | Notes |
|---|---|---|
| In-113 | Stable | 4.3% natural abundance |
| In-115 | Radioactive | 95.7% natural abundance; very long half-life |
Scientific Applications
| Use Case | Description |
|---|---|
| Solder Research | Used in low-melting-point alloy development |
| Vacuum Technology | Employed in ultra-high vacuum sealing studies |
| Crystal Growth | Used as flux for semiconductor crystal production |
| Thin Film Deposition | Used in sputtering targets for ITO coatings |
| Thermal Interface Materials | Studied for thermal management in microelectronics |
Industrial Applications
| Use Case | Description |
|---|---|
| Touchscreens & Displays | Indium tin oxide (ITO) used for transparent electrodes |
| Low-Temp Solders | Essential for electronics and cryogenic soldering |
| Solar Cells | Used in copper indium gallium selenide (CIGS) photovoltaics |
| LEDs & Lasers | Used in III-V semiconductors like InGaN |
| Thermal Conductive Pastes | Fills microgaps in heat sinks and processors |
| Purity | Main Use |
|---|---|
| In 99.8% (2N8) | Used in general solder alloys and sealing applications |
| In 99.995% (4N5) | Suitable for electronics, touchscreens, and ITO production |
| In 99.999% (5N) | Ideal for semiconductors and high-reliability solders |
| In 99.99998% (6N8) | Used in crystal growth, advanced optics, and ultra-pure semiconductor processes |
| Synonym |
|---|
| In |
| Elemental Indium |
| Indium Metal |
| Indio |