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| LaAlO3 | |
|---|---|
| Name | Lanthanum aluminate |
| Formula | LaAlO3 |
| Category | Perovskite oxide |
| Crystal system | Rhombohedral (pseudocubic) |
| Color | White to off-white |
| Hardness | 5–6 (Mohs) |
| Density | 6.5 g/cm³ |
LaAlO3 LaAlO3 is a perovskite oxide composed of lanthanum and aluminum widely studied for its structural, electronic, and interfacial properties. Researchers in condensed matter physics, materials science, and solid-state chemistry investigate LaAlO3 for its lattice-matching behavior with oxide substrates, dielectric characteristics, and role in emergent interfacial phenomena. The compound is relevant to experimental programs at facilities such as CERN, Lawrence Berkeley National Laboratory, Max Planck Institute for Solid State Research, and projects connected to Bell Labs and IBM Research.
LaAlO3 occurs as a synthetic oxide used as a single-crystal substrate and thin-film material in many studies connected to Perovskite solar cells, High-temperature superconductivity, Quantum Hall effect, Two-dimensional electron gas, and oxide electronics demonstrations led by groups at Stanford University, University of Cambridge, Massachusetts Institute of Technology, and ETH Zurich. Its compatibility with oxide families such as SrTiO3, BaTiO3, NdGaO3, and KTaO3 makes it a standard reference in interfacial research funded by programs at the National Science Foundation, European Research Council, and national laboratories like Argonne National Laboratory.
LaAlO3 adopts the perovskite ABO3 motif with lanthanum on the A site and aluminum on the B site; at room temperature it shows a rhombohedral tilt-distorted structure closely approximated by a pseudocubic cell used for lattice matching with other oxides. Detailed structural characterization uses techniques developed at Brookhaven National Laboratory, Diamond Light Source, and Institut Laue–Langevin including X-ray diffraction, neutron scattering, and transmission electron microscopy performed in facilities at University of Oxford and Harvard University. Elastic, dielectric, and thermal properties of LaAlO3 are often compared with benchmark materials such as Al2O3 (sapphire), MgO, and SrTiO3 in studies published in journals coordinated by societies like the American Physical Society, Royal Society of Chemistry, and Materials Research Society.
Bulk single crystals of LaAlO3 are commonly grown by the Czochralski process or Floating zone technique at specialized centers including Hollings Manufacturing and university crystal-growth facilities at University of Tokyo and Tohoku University. Thin films are deposited by methods such as Molecular beam epitaxy, Pulsed laser deposition, Metal-organic chemical vapor deposition, and Sputtering in cleanrooms supported by institutions like Sandia National Laboratories, Los Alamos National Laboratory, and university microfabrication centers at EPFL and Tsinghua University. Process parameter optimization often references standards from SEMATECH and instrumentation from vendors such as Veeco and Kurt J. Lesker Company.
The wide band gap and high dielectric constant of LaAlO3 make it relevant for capacitive and insulating layers in heterostructures; optical characterization employs spectroscopy methods used at SLAC National Accelerator Laboratory and facilities associated with Fermi National Accelerator Laboratory. Electronic studies explore interface-driven phenomena linked to research on Mott insulators, Topological insulators, and oxide interfaces analogous to systems pursued by groups at California Institute of Technology and Princeton University. Optical phonon modes and infrared responses are compared to classic materials in reviews appearing in journals from IEEE and the Optical Society of America.
The LaAlO3 interface with SrTiO3 is a canonical system exhibiting a two-dimensional electron gas, superconductivity, magnetism, and tunable transport, inspiring collaborative programs at MIT, University of California, Berkeley, University of Tokyo, and National University of Singapore. Interfacial reconstruction, polar discontinuity, and oxygen vacancy effects are topics of study in projects affiliated with Max Planck Society, Riken, and the Japan Society for the Promotion of Science. Heteroepitaxy with ferroelectric perovskites such as PbTiO3 and multiferroics like BiFeO3 leverage LaAlO3 substrates in experiments funded by agencies including DARPA and the European Commission.
LaAlO3 is employed as a substrate for thin-film growth in prototype devices developed by teams at Intel, TSMC, and university spin-offs from University of Cambridge and Northwestern University; applications targeted include oxide transistors, tunnel junctions, and capacitors relevant to Automotive Electronics programs and quantum device demonstrations at Google Quantum AI and Microsoft Research. Research toward optoelectronic components, memristive elements, and sensors references collaborations with industrial partners such as Toyota Research Institute and Siemens.
Handling and processing of LaAlO3 powders and crystals follow protocols established by institutional safety offices at Johns Hopkins University and Yale University, with guidance compatible with standards from Occupational Safety and Health Administration and chemical hygiene plans used at University of California, San Diego cleanrooms. Waste management and thermal processing considerations are coordinated with hazardous-materials programs at Lawrence Livermore National Laboratory and local environmental agencies.
Category:Perovskites Category:Lanthanum compounds Category:Aluminum compounds