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Lanthanum Aluminate Single Crystal Substrate, (111), SSP (10 pcs/box)
Product Type: LaAlO3 single crystal substrate
Research-grade laboratory product
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LABORATORY PROCUREMENT SUPPORT
For material matching, specification review, model selection or configuration confirmation, contact our technical sales team.
E-MAIL: inquiry@atomfair.com
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Manufacturer: Atomfair LLC
Brand: ATOMFAIR®
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The substrate is chemically stable but requires careful handling due to natural twin domains and sensitivity to thermal and mechanical stress. Avoid exposure to phosphoric acid above 150°C, which can dissolve the material.
- Thermal constraint: Thermal expansion coefficient of 9.4 × 10⁻⁶ /°C necessitates controlled heating and cooling rates to prevent substrate cracking.
- Mechanical constraint: Hardness of 6.5 Mohs and pseudo-cubic structure make the substrate prone to chipping or fracture under excessive clamping or thermal shock.
- Optical and chemical constraint: Polished substrates exhibit natural twin domains that can influence film nucleation, and the brown-yellow appearance varies with annealing condition.
- Orientation constraint: Orientation tolerance of ±0.5° requires precise alignment during film deposition to maintain crystal registry.
What are the dielectric properties of the LaAlO3 (111) substrate at cryogenic temperatures?
The substrate has a dielectric constant of 24.6 and a loss tangent of approximately 3 × 10⁻⁴ at 300 K, which decreases to about 0.6 × 10⁻⁴ at 77 K. This low loss at cryogenic temperatures makes it particularly suitable for microwave device applications, such as high-temperature superconducting filters.
What is the orientation tolerance of the (111) LaAlO3 substrate and why is it critical for epitaxial growth?
The orientation tolerance is ±0.5°. This precision ensures consistent crystallographic alignment across the entire substrate, which is essential for achieving uniform epitaxial thin-film growth, especially for materials that are sensitive to off-axis misalignment.
What chemical cleaning or etching procedures are compatible with LaAlO3 substrates?
LaAlO3 substrates are insoluble in mineral acids at room temperature, making standard solvent-based cleaning safe. However, they are soluble in H₃PO₄ above 150°C, so phosphoric acid at elevated temperatures must be avoided for any etching or cleaning step. Polished substrates have natural twin domains and a brown-yellow appearance that are not affected by typical cleaning procedures.
LaAlO3 (111) substrates with SSP finish offer high thermal stability (melting point 2080°C) and low dielectric loss at cryogenic temperatures, but exhibit natural twin domains and require careful orientation tolerance consideration.
Positive
- High melting point: Melting point of 2080°C with thermal expansion coefficient 9.4×10⁻⁶/°C enables use in high-temperature thin-film deposition and annealing processes.
- Low dielectric loss at 77 K: Loss tangent of ~0.6×10⁻⁴ at 77 K and dielectric constant 24.6 make this substrate suitable for microwave or cryogenic device applications.
Trade-offs
- Natural twin domains: Polished substrates exhibit natural twin domains and brown-yellow coloration depending on annealing, which may interfere with optical inspection or require additional characterization for some epitaxial films.
- Orientation tolerance ±0.5°: The ±0.5° orientation tolerance may be a constraint for processes requiring precise lattice alignment for heteroepitaxial growth.
Every advanced material, component, equipment, and instrument in our catalog is backed by rigorous testing. We maintain strict internal quality management frameworks and align with CE conformity metrics to deliver transparent, reproducible performance data via our public open-science repository.
To request raw batch performance data, submit formal vendor registration paperwork, or execute a fast-turnaround R&D manufacturing loop, contact us at inquiry@atomfair.com.
Item is dispatched under the Atomfair Shipping & Delivery Framework (Free worldwide shipping on orders over $59 USD excl. heavy equipment). Return is governed by the Atomfair Return & Refund Policy (7-day technical return window).
