Precious Metal Products Crucibles for Single-Crystal Growth
Precious metal crucibles and related instruments are used for the single-crystal growth of high-melting-point materials. Furuya Metal primarily works with iridium and platinum, leveraging processing and refining technologies cultivated over many years to provide products with exceptional purity and dimensional precision.
We also offer long-life products utilizing proprietary strengthened iridium and strengthened platinum materials. In addition to crucibles, we manufacture a wide range of instruments required for single-crystal growth, including seed holders, after-heaters, reflectors, and dies.
Iridium crucibles
Iridium is a material characterized by a melting point exceeding 2,400°C, high strength at elevated temperatures, excellent oxidation resistance, and exceptional chemical stability.
In the field of single-crystal growth, iridium crucibles and related instruments are used for the growth of high-melting-point materials such as oxide single crystals. Iridium maintains excellent chemical stability even under high-temperature conditions, resulting in extremely low levels of reaction with melts and contamination, making it suitable for the growth of high-purity single crystals.
Material properties and features
- Melting point of approximately 2,446°C
- Excellent mechanical strength and creep resistance at elevated temperatures
- High corrosion resistance against oxide melts
- Minimal impurity contamination, making it suitable for high-purity processes
Major single crystals grown
- Lithium tantalate (LiTaO₃)
- Sapphire
- YAG
- Gallium oxide (Ga₂O₃)
- Various scintillator crystals
- Various Faraday rotator crystals
Major crystal growth methods using iridium crucibles
Czochralski (CZ) method, Edge-Defined Film-Fed Growth (EFG) method, Micro-Pulling-Down (μ-PD) method
Platinum crucibles
Platinum is a material distinguished by excellent corrosion resistance, chemical stability, and a high melting point. It remains stable against a wide range of molten materials, whether acidic or alkaline, and is therefore used extensively in applications ranging from analytical and research fields to industrial processes.
Platinum also offers excellent ductility and workability, enabling highly precise forming and fabrication. In addition, its relatively high thermal conductivity contributes to uniform temperature distribution, enabling highly reproducible melting and heating processes.
Material properties and features
- Melting point of approximately 1,768°C
- High corrosion resistance against acids, alkalis, and glass melts
- Highly precise forming enabled by excellent ductility and workability
- High reproducibility enabled by stable material properties
Major single crystals grown
- Lithium niobate (LiNbO₃)
- Gallium oxide (Ga₂O₃)
- Various scintillator crystals
- Various nonlinear optical crystals
- Various piezoelectric single crystals
Major crystal growth methods using platinum crucibles
Czochralski (CZ) method, Vertical Bridgman Method, Liquid Phase Epitaxy (LPE) method, Micro-Pulling-Down (μ-PD) method
Examples of crucibles used in the CZ (Czochralski) method
The CZ method is one of the most widely used crystal growth technologies for producing high-quality single crystals from molten raw materials. A wide variety of crystals, including silicon single crystals used for semiconductor substrates, are grown using this method.
Various instruments, including crucibles, are used in the crystal growth process, and Furuya Metal manufactures iridium and platinum instruments for the growth of high-melting-point single crystals.
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