## Common ground
All options are sputtering targets made from different metallic or ceramic materials used in thin-film deposition.
## Options at a glance
**6909.19 – Ceramic**
- **Defining trait:** Made from non-metallic, inorganic compounds (e.g., oxides, nitrides) with high thermal/chemical stability.
- **Typical examples:** Al₂O₃, SiO₂, TiN targets.
- **Best fit when:** Used in high-durability coatings or insulating films (e.g., semiconductor dielectrics).
**7419.80 – Copper**
- **Defining trait:** Metallic, highly conductive, soft metal; used for low-resistivity interconnects.
- **Typical examples:** Cu interlayer in ICs, RF shielding.
- **Best fit when:** Deposition of electrically conductive layers in microelectronics.
**7508.90 – Nickel**
- **Defining trait:** Magnetic, corrosion-resistant metal; often used in magnetic storage or wear-resistant coatings.
- **Typical examples:** Ni in hard disk drives, anti-corrosion films.
- **Best fit when:** Applications requiring magnetic properties or oxidation resistance.
**7616.99 – Aluminium**
- **Defining trait:** Lightweight, conductive metal; commonly used for reflective or conductive layers.
- **Typical examples:** Al in solar cells, aluminum mirrors, semiconductor metallization.
- **Best fit when:** Needing lightweight, reflective, or conductive films.
**8102.99 – Molybdenum**
- **Defining trait:** High melting point, good thermal stability; used in high-temperature applications.
- **Typical examples:** Mo in OLEDs, semiconductor substrates.
- **Best fit when:** Deposition under high heat or in demanding environments.
**8103.99 – Tantalum**
- **Defining trait:** Excellent corrosion resistance and high density; used in capacitors and diffusion barriers.
- **Typical examples:** Ta in DRAM capacitors, barrier layers in ICs.
- **Best fit when:** Needing stable, dense, or insulating films in advanced electronics.
**8109.99 – Zirconium**
- **Defining trait:** High melting point, oxidation-resistant; used in wear-resistant and refractory coatings.
- **Typical examples:** ZrO₂ for thermal barriers, Zr in alloys.
- **Best fit when:** Coatings requiring extreme heat or wear resistance.
**8112.29 – Chromium**
- **Defining trait:** Hard, corrosion-resistant metal; used for hard coatings and adhesion layers.
- **Typical examples:** Cr in hard chrome plating, seed layers in deposition.
- **Best fit when:** Needing wear resistance or a base layer for other films.
**8112.99 – Niobium**
- **Defining trait:** Superconducting properties at low temperatures; used in superconducting electronics.
- **Typical examples:** Nb in SQUIDs, superconducting RF cavities.
- **Best fit when:** Applications involving superconductivity or high-frequency devices.
## Key differences
| Material | Melting Point | Conductivity | Magnetic? | Primary Use Case |
|----------------|---------------|--------------|-----------|-------------------------------|
| Ceramic | Very High | Low (insulator) | No | Dielectrics, insulation |
| Copper | Medium | Very High | No | Interconnects, conductors |
| Nickel | High | Medium | Yes | Magnetic layers, corrosion resistance |
| Aluminium | Medium | High | No | Reflective/conductive films |
| Molybdenum | Very High | Medium | No | High-temp applications |
| Tantalum | Very High | Medium | No | Capacitors, barriers |
| Zirconium | Very High | Low | No | Refractory, wear-resistant |
| Chromium | High | Low | No | Hard coatings, adhesion layers|
| Niobium | High | Medium | No | Superconductors |
## How to choose
1. Is the target used in insulating or dielectric films? → 6909.19
2. Does it need high electrical conductivity? → 7419.80 or 7616.99
3. Is magnetic behavior required? → 7508.90
4. Is the application in superconducting devices? → 8112.99
5. Is extreme heat or wear resistance needed? → 8102.99, 8109.99
## Overlaps & pitfalls
- Some materials (e.g., Ta, Nb) may both act as barriers and conductors; prioritize based on **main function**.
- "Ceramic" (6909.19) includes oxides/nitrides—ensure it’s not a metal oxide misclassified as metallic.
- No clear priority rule: choose based on the **primary purpose** of the target in your application