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| Aluminium nitride | |
|---|---|
| Name | Aluminium nitride |
| Formula | AlN |
| Molar mass | 40.99 g·mol−1 |
| Appearance | white to gray solid |
| Density | 3.26 g·cm−3 |
| Mp | 2200 °C (decomposes) |
| Cas number | 24304-00-5 |
Aluminium nitride is a binary inorganic compound of aluminium and nitrogen appearing as a white to gray refractory ceramic with high thermal conductivity and electrical insulation. It occupies a niche at the intersection of materials science, solid-state chemistry, and electronic engineering, and is of interest to researchers associated with institutions such as Massachusetts Institute of Technology, Stanford University, Intel, IBM, and Toyota. Industrial producers and consortia like CeramTec, Kyocera, Sumitomo Electric, and Nippon Steel develop AlN for applications in power electronics, optoelectronics, and heat-management systems in collaboration with standards bodies such as IEEE and IEC.
Aluminium nitride is a ceramic material used widely for heat dissipation in devices developed by firms like Texas Instruments, NVIDIA, Samsung Electronics, and Qualcomm. It is evaluated in laboratories at organizations including Sandia National Laboratories, Oak Ridge National Laboratory, and Los Alamos National Laboratory for thermal interface materials, substrates, and high-frequency modules. Research groups in universities such as University of California, Berkeley, University of Cambridge, Imperial College London, and Tsinghua University characterize its role in emerging technologies tied to programs at agencies like DARPA and European Space Agency.
Crystallographically, aluminium nitride commonly adopts the wurtzite structure related to materials studied at Bell Labs and in texts by researchers from Max Planck Society. Its hexagonal lattice yields strong Al–N bonds comparable to those in materials investigated by chemists affiliated with Royal Society of Chemistry and American Chemical Society publications. AlN exhibits a wide band gap, high Young’s modulus, and thermal stability comparable with ceramics developed at Corning Incorporated and Saint-Gobain. The interplay of lattice defects and grain boundaries is analyzed in studies from ETH Zurich and Ecole Polytechnique Fédérale de Lausanne.
Industrial routes to aluminium nitride include direct nitridation of aluminium metal, carbothermal reduction and nitridation of alumina, and vapor-phase techniques pioneered in research programs at Bell Labs and industrial R&D at Hitachi. Powder processing, hot pressing, and sintering methods are used by companies such as Sumitomo Chemical and Furukawa Electric to produce dense ceramics. Chemical vapor deposition and molecular beam epitaxy approaches employed in laboratories at Cornell University and University of Illinois at Urbana–Champaign yield thin films suitable for microelectronics. Scale-up and quality control often reference standards from American Society for Testing and Materials and collaborations among manufacturers like BASF and DuPont.
Aluminium nitride is deployed as substrates and packages in power modules made by ABB, Schneider Electric, and Siemens. It is used in radio-frequency and microwave devices produced by Rohde & Schwarz and Keysight Technologies, and in light-emitting diode assemblies from Osram and Philips. Aerospace and space applications investigated by NASA and European Space Agency take advantage of AlN’s thermal performance. In research labs at Caltech and Johns Hopkins University it is explored for MEMS, SAW devices, and piezoelectric components linking to projects funded by National Science Foundation and NIH.
The wide band gap and dielectric behavior of AlN are of interest to designers at Intel Corporation and AMD for high-voltage isolation and thermal management. Studies from IBM Research and NXP Semiconductors quantify thermal conductivity values comparable to engineered materials used in products by Apple and Dell. Carrier dynamics and defect-related luminescence are investigated at facilities such as Lawrence Berkeley National Laboratory and reported in journals of the American Physical Society and Institute of Physics. Integration with silicon devices—work pursued at TSMC and GlobalFoundries—targets improved heat spreaders and substrate materials for next-generation power electronics supported by consortia including SEMI.
Surface oxidation, passivation, and interface chemistry of AlN are topics of study at institutions like Yale University and Princeton University. Reaction with moisture and oxygen leads to surface layers analogous to phenomena examined in publications by the Royal Society and ACS Publications. Techniques such as X-ray photoelectron spectroscopy from groups at Lawrence Livermore National Laboratory and transmission electron microscopy work at Argonne National Laboratory probe interfacial reactions relevant to bonding approaches used by 3M and Henkel for adhesives and metallization schemes. Treatments developed in collaboration with companies like Applied Materials and Lam Research improve adhesion and metallurgical compatibility.
Handling of aluminium nitride powders and ceramics follows guidelines similar to those promulgated by Occupational Safety and Health Administration and European Chemicals Agency for fine inorganic particulates. Industrial hygiene practices recommended by National Institute for Occupational Safety and Health and British Standards Institution apply during machining, sintering, and deposition operations carried out at facilities operated by Honeywell and Boeing. Waste management and lifecycle assessments are considered in studies supported by United Nations Environment Programme and national regulators such as Environmental Protection Agency.
Category:Inorganic compounds