5 PACK

Lanthanum Strontium Aluminium Tantalate (LSAT) Crystal Substrates (5pack)

£169.00
(5 Pack)

Price per substrate = £33.80 ea

  • Fast Worldwide Delivery

  • High Quality Substrates

AVAILABILITY: In Stock - Delivery straight away

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MATERIAL INFORMATION
MATERIAL PROPERTIES
XRD ANALYSIS
DELIVERY
FAQS
MATERIAL INFORMATION

  • Name: LSAT, Lanthanum Strontium Aluminium Tantalate crystal substrate
  • (LaAlO3)0.3(Sr2TaAlO6)0.7 or its less common alternative: (La0.18Sr0.82)(Al0.59Ta0.41)O3
  • Lattice parameter: a=7.736 Å (so ½ a = 3.868 Å)
  • Crystal Structure: Perovskite, Cubic
  • Commonly used as substrate for: many perovskite crystals, high-T semiconductors awith relatively low strain as wells as GaN
  • <0.2 nm rms roughness (measured 5x5 µm AFM scan)
  • 5x5 mm to 2 inch diameter and customized
  • Single or double side polished
  • Optically transparent, chemically and thermally stable even in reducing atmospheres keeping low electrical conductivity across a range of deposition conditions
  • Next day delivery
  • Melting point 1,840 °C means that high quality crystals can be grown using the Czochralski process which keeps the cost lower than other growth methods and can be grown in larger diameter crystals than e.g. STO.

LSAT substrates are popular for epitaxial oxides and their heterostructures, often in the study of electron correlation phenomena. LSAT, along with the other perovskite substrates we stock is great for growing perovskites e,g, strontium titanate (SrTiO3), cuprate superconductors (such as YBCO), iron-based superconductors (iron-pnictides), rare-earth manganites, rare-earth nickelates and others. Semiconductors such as gallium nitride can also be grown on LSAT.

The lattice constant of LSAT is a=7.736 Å (so ½ a = 3.868 Å) so most perovskite films match with the half lattice constant of LSAT making good films with low strain. LSAT crystal has larger size and higher crystallinity than SrTiO, and it does not contain twins in the structure as does LaAlO3  which occur due to the phase transition on cooling of LAO. 

One of the differentiators of LSAT as a substrate for the growth films stems is its high chemical and thermal stability, and very low electrical conductivity across a range of temperatures. The growth conditions for some epitaxial layers can cause some substrates to form high densities of defects that can alter their properties. One example is the tendency of strontium titanate to form oxygen vacancy defects under high temperatures in high vacuum. These defects result in considerable variations of its properties, including the increase of electrical conductivity and optical opacity. LSAT on the other hand, is stable in both oxidizing and fairly reducing environments in high temperatures, thus enabling a larger window for the processing and growth conditions.

So if you’re growing perovskites or other materials at reducing conditions or at very high T then consider using LSAT.


 

MATERIAL PROPERTIES

LINEAR FORMULA:
(LaAlO3)0.3(Sr2TaAlO6)0.7 or (La0.18Sr0.82)(Al0.59Ta0.41)O3
PURITY: >99.99%
CRYSTAL ORIENTATION:  (100), (110) & (111)
GROWTH METHOD: Chralski (CZ) method
CRYSTAL STRUCTURE: Cubic
LATTICE CONSTANT: a = 3.868 Å
MELTING POINT  (°C): 1840
THERMAL EXPANSION COEFFICIENT (/K): 10 X 10-6/°C
HARDNESS: 6.5
MOLAR MASS (G/MOL):
DENSITY (G/CM3): 6.74 g/cm3
REFRACTIVE INDEX:
DIELECTRIC CONSTANTS: ε = 9.8 or 22
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

 

 

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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