5 PACK

LAO (LaAlO3) Lanthanum Aluminate Crystal Substrates (5pack)

$106.00
(5 Pack)

Price per substrate = $21.20 ea

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  • High Quality Substrates

AVAILABILITY: Delivery ~3 weeks

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MATERIAL INFORMATION
MATERIAL PROPERTIES
XRD ANALYSIS
DELIVERY
FAQS
MATERIAL INFORMATION

LaAlO3 (LAO)
  • Name: LAO (LaAlO3), Lanthanum Aluminate Single Crystal Substrates
  • Lattice parameter: a = 3.787 Å
  • Crystal Structure:  Rhombohedral distorted perovskite
  • Commonly used as substrate for: High temperature super conductors e.g. YBCO, many perovskites including titanates, aluminates, ferrites, zirconates and stannates.
  • Orientation of LaAlO3 substrates: (100), (110), (111)
  • Surface Roughness: Ra < 0.2nm (measured 5x5 µm AFM scan)
  • Crystal has a relatively high dielectric constant (25)
  • Wide energy gap
  • Good lattice matching; A substrate for high-temperature superconducting films
  • Good chemical stability
  • High Transparent

LaAlO3 (LAO) single crystal substrates are optically transparent with a pseudo-perovskite structure provides a good lattice match to many other materials with perovskite structure making them well suited to support complex oxides thin films. LAO is a favoured crystal for growing BiFeO3 films which when grown on LAO exhibit exotic multifunctional properties. LAO is an excellent substrate for epitaxial growth of high Tc superconductors, particularly for cuprate superconductors such as YBCO and GdBCO as well as magnetic and ferro-electric thin films. The dielectric properties of LaAlO3 crystal are well suitable for low loss microwave and dielectric resonance applications. 

Crystalline LaAlO3 has a relatively high relative dielectric constant of ~25. As a high-k material, LAO is a promising replacement for SiO2 as a gate dielectric materials in MOSFET transistors (LaAlO3 is insoluble in mineral acids at 25 °C but soluble in H3PO3 > 150 °C). 

LAO's crystal structure is a rhombohedral distorted perovskite with a pseudocubic lattice parameter of 3.787 Å. A crystal twin is formed due to the phase transition  from cubic to rhombohedral (Tc = 813 K) on cooling the single crystal therefore LAO surfaces can show twin defects visible to the naked eye as a straight line through the crystal.

Hayward et al. 2005 - Schematic representation of the AlO6 polyhedral network in a) cubic and b) rhombohedral LaAlO3, viewed down the (001) trigonal, equivalent to (111) cubic. 

One of the most important and common uses for epitaxial LAO grown on STO substrates is at the lanthanum aluminate-strontium titanate interface. Whist this does not involve the use of LAO substrates, as typically LAO layer grown on STO it is still noteworthy here: In 2004, it was discovered that when 4 or more unit cells of LAO are epitaxially grown on strontium titanate (SrTiO3, STO), a conductive 2-dimensional layer is formed at their interface. Individually, LaAlO3 and SrTiO3 are non-magnetic insulators, yet LaAlO3/SrTiO3 interfaces exhibit electrical conductivity, superconductivity, ferromagnetism, large negative in-plane magnetoresistance, and giant persistent photoconductivity. The study of how these properties emerge at the LaAlO3/SrTiO3 interface is a growing area of research in condensed matter physics.

In short if you are growing perovskites then you might be looking at using SrTiO3 and LaAlO3 among other substrates. LAO offers a lower lattice parameter which may be important to get good epitaxy or to add strain into your system after growth.

    MATERIAL PROPERTIES

    LINEAR FORMULA:
    LaAlO₃
    PURITY: >99.99%
    CRYSTAL ORIENTATION:  (100), (110) & (111)
    GROWTH METHOD:
    Czochralski method
    CRYSTAL STRUCTURE:
    Pseudo cubic
    LATTICE CONSTANT:
    MELTING POINT  (°C): 2080 °C
    THERMAL EXPANSION COEFFICIENT (/K): 10 × 10-6/°C
    HARDNESS:
    6.5 Mohs
    MOLAR MASS (G/MOL): 213.89 g/mol
    DENSITY (G/CM3): 6.52 g/mL at 25 °C (lit.)
    REFRACTIVE INDEX:
    DIELECTRIC CONSTANTS: ~25
    CHEMICAL STABILITY: 
    SIZES: 5x5mm & 10x10 mm
    TYPICAL THICKNESS: 0.5mm
    SIZE TOLERANCES:  +/- 0.1mm
    THICKNESS TOLERANCES:  +/- 0.015mm
    ORIENTATION PRECISION: +/-0.5 degree
    POLISHING OPTIONS: SINGLE SIDED (1SP) OR BOTH SIDES POLISHED (2SP)
    ROUGHNESS RA: <0.5nm
    REACTION SUITABILITY  Reagent Type: Catalyst
    Core: Lanthanum

     

    XRD ANALYSIS

    coming soon.

    DELIVERY

    How long does it take for you to ship out after purchase? In-Stock Substrates are held in our US warehouse and we aim to have substrates shipped out within 24-48 hours.

    Pre-Order Substrates are manufactured and delivered in 3-4 weeks. 

    How much is shipping? All substrates are shipped free of charge within the USA. This shipping takes approx 4-5 days to arrive once shipped. 

    Expedited delivery? Faster delivery options are available. Below are some indicative prices. To get the cost for your package and location, just add your address at check out and select the shipping option you want to check.

    • USA FedEx 2 day delivery: typically $25 USD
    • USA FedEx Overnight Delivery: typically $65USD. 
    • Canada FedEx International Priority: typically $25 USD.

      Europe and UK Delivery? Approx cost for delivery is 50 Euros. Shipping costs will be calculated at check-out based on your address or please complete the quote form and we will email you the price. VAT and customs charges are payable by the buyer. 

      Rest of Worldwide Shipping? Shipping costs to the rest of the World, will be calculated at check-out. Please be aware that delivery times and tracking information vary for each country. Customs charges may apply if shipping outside of the US and are payable by the buyer.

        FAQS

        How can I place an order? The quickest way to get your item is to buy through the website – the order is automatically picked up in our system and in stock items ships out asap.

        We can accept purchase orders for established universities and companies and are happy to work with your institutes payment systems if required (although please note we are a small company so would prefer pre-payment via our website for small or one-off orders). 

        We have flexible payment options and can give you a quotation in any of the following currencies (USD $, CAD $, GBP £, EUROS €  AUD $).

        You can download a copy of our W8 form here.

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        Do you send substrates to Europe? Yes, we have many long term customers buy from all over Europe including France, UK, Germany, Italy, Norway, Netherlands. Please buy through the website or get in touch if you need a specific substrate. 

        We believe we have the cheapest and best quality products in the USA. If you find another US company with a lesser price (including delivery) we would be happy to price match. 

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