SrLaGaO4 Single Crystal Substrate (Czochralski-Grown, Tetragonal Perovskite-Related Structure)

Overview

SrLaGaO₄ (Strontium Lanthanum Gallate Oxide) is a perovskite-related tetragonal single crystal substrate engineered for high-precision epitaxial growth of complex oxide thin films—particularly high-temperature superconductors such as YBa₂Cu₃O_7−δ (YBCO). Its structural compatibility arises from its pseudo-perovskite lattice symmetry and closely matched out-of-plane and in-plane lattice parameters, enabling low-defect heteroepitaxy with minimal interfacial strain. Unlike conventional substrates such as SrTiO₃ or LaAlO₃, SrLaGaO₄ exhibits a moderate dielectric constant (ε_r = 16–20), reduced microwave loss tangent, and superior thermal stability up to 1600 °C—making it suitable for both fundamental solid-state physics research and advanced RF/microwave device fabrication where low dispersion and high Q-factor performance are critical.

Key Features

• Tetragonal crystal structure with well-defined lattice constants (a = 3.843 Å, c = 12.680 Å), optimized for epitaxial alignment with YBCO (lattice mismatch: 5.7%)
• Ultra-low surface roughness (< 5 Å RMS) achieved via precision mechanical polishing and post-annealing in controlled oxygen atmospheres
• Czochralski (CZ) growth method ensures high crystalline homogeneity, low dislocation density (< 1 × 10⁴ cm⁻²), and reproducible stoichiometry
• Thermally robust architecture: melting point ≈ 1600 °C; density 4.88 g/cm³; chemically inert under standard oxide MBE and PLD process conditions
• Available in standard orientations ( and ) with angular tolerance ≤ ±0.5°, supporting both in-plane and out-of-plane epitaxial registry control
• Surface finish options include single-polished (SP) and double-polished (DP) configurations to accommodate backside metallization or optical characterization requirements

Sample Compatibility & Compliance

SrLaGaO₄ substrates are routinely employed in ultra-high-vacuum (UHV) deposition systems including pulsed laser deposition (PLD), molecular beam epitaxy (MBE), and sputtering platforms. Their chemical stability in oxidizing environments eliminates the need for pre-deposition reduction treatments common with reactive substrates. All wafers undergo final inspection in ISO Class 6 (1000) cleanrooms and are hermetically sealed in ISO Class 5 (100) clean bags—fully compliant with SEMI F57-0201 standards for semiconductor-grade substrate packaging. While not certified to ISO/IEC 17025, material traceability includes batch-specific XRD rocking curve data, AFM topography reports, and EDX elemental mapping upon request—supporting GLP-aligned thin-film development workflows.

Software & Data Management

As a passive crystalline substrate, SrLaGaO₄ does not incorporate embedded electronics or firmware. However, its use in quantitative thin-film metrology requires rigorous data provenance. Each shipment includes a digital Certificate of Analysis (CoA) containing orientation verification (X-ray θ–2θ scan), surface roughness profile (AFM line scans), and lattice parameter confirmation (HR-XRD reciprocal space mapping). CoAs are timestamped, digitally signed, and archived for ≥10 years—enabling full audit trails compatible with FDA 21 CFR Part 11–compliant laboratory information management systems (LIMS) when integrated with third-party deposition monitoring software (e.g., INFICON SQC-310, Riber EpiControl).

Applications

• Epitaxial growth of YBCO, SmFeAsO, and other iron-based or cuprate superconducting films for Josephson junctions and SQUID sensors
• Template layer for ferroelectric oxide heterostructures (e.g., BiFeO₃/SrLaGaO₄) targeting multiferroic memory devices
• Substrate for high-frequency dielectric resonators operating in K- and Ka-bands (26–40 GHz), leveraging low ε_r and temperature-stable permittivity
• In-situ synchrotron X-ray diffraction studies of interfacial strain relaxation kinetics during oxide film nucleation
• Reference material for calibration of scanning probe microscopy (SPM) tip geometry and piezoresponse sensitivity

FAQ

What is the typical dislocation density of CZ-grown SrLaGaO₄ substrates?
Typical threading dislocation density ranges from 5 × 10³ to 2 × 10⁴ cm⁻², verified by plan-view TEM and etch-pit density analysis.
Can SrLaGaO₄ be used for metal–organic chemical vapor deposition (MOCVD)?
Yes—its thermal stability and inert surface allow compatibility with MOCVD precursors at temperatures up to 850 °C under O₂/N₂ carrier gas mixtures.
Is off-axis cut available for step-flow growth mode?
Custom off-axis orientations (e.g., 0.5°–4° toward ) are available upon technical review and minimum order quantity agreement.
Do you provide substrate bonding services or pre-patterned versions?
Standard substrates are supplied unpatterned and unbonded; however, wafer-level bonding (e.g., direct oxide bonding) and lithographic patterning can be coordinated through our qualified cleanroom partners.
How is surface contamination monitored prior to shipping?
Each batch undergoes Fourier-transform infrared spectroscopy (FTIR) for hydrocarbon residue detection and total organic carbon (TOC) analysis of rinse water extracts—results included in the CoA.