LSAT (oxide)

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LSAT (oxide)
Names
Other names
lanthanum aluminate - strontium aluminium tantalate
Identifiers
Properties
(LaAlO3)0.3(Sr2TaAlO6)0.7
Density 6.74 g/cm3
Melting point 1,840 °C (3,340 °F; 2,110 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Not to be confused with Law School Admission Test.

LSAT is the most common name for the

thin films
.

Background

LSAT was originally developed as a substrate for the growth of high Tc cuprate superconductors thin films, mostly of yttrium barium copper oxide (YBCO), for microwave device applications. The motivation for its development was to create a lattice-matched substrate with a similar thermal expansion coefficient and no structural phase transition over a wide temperature range, spanning from the high temperatures used for the growth of cuprates, to the cryogenic temperatures where they are superconducting.[1]

Properties

LSAT has a

perovskite oxides with a relatively low strain.[citation needed
]

LSAT's melting temperature of 1,840C is lower compared to similar alternative substrates, such as

Czochralski process (CZ), which has commercial advantages.[4]

Uses

An LSAT single-crystal substrate (5x5x0.5 mm)

LSAT is primarily used in its

nickelates and others. Semiconductors such as gallium nitride can also be grown on LSAT.[5]

LSAT's usefulness as a substrate for the growth of such films stems from its high chemical and thermal stability, and very low electrical conductivity. The growth conditions for such 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.[citation needed]

See also

References

  1. doi:10.1063/1.366925
    .
  2. ^ LSAT properties Archived 2014-06-27 at archive.today from the manufacturer Toplent Photonics Componenets
  3. ^ LSAT properties from the manufacturer Sigma-Aldrich
  4. ^ LSAT specs and information from the manufacturer MTI Corp.
  5. doi:10.1039/C3TC00916E
    .
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