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Nonreactive Crucible Material for Growth of Single Crystal, High Temperature YBa2Cu3O7 Superconductors

IP.com Disclosure Number: IPCOM000101171D
Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 1 page(s) / 43K

Publishing Venue

IBM

Related People

Angilello, J: AUTHOR [+5]

Abstract

When growing single crystals of YBa2Cu3O7 from a multiphase mixture of YBa2Cu3O7 and a liquidus phase (1), the liquidus phase wets the crucible and is wicked away from the growth region. This decrease in the amount of the liquidus phase limits the size of the YBa2Cu3O7 single crystals. The wicking has been observed with Al2O3, many orientations of sapphire, MgO, Au, etc. The wicking has even been used by others to grow single crystals from gold crucibles (2).

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Nonreactive Crucible Material for Growth of Single Crystal, High Temperature YBa2Cu3O7 Superconductors

       When growing single crystals of YBa2Cu3O7 from a
multiphase mixture of YBa2Cu3O7 and a liquidus phase (1), the
liquidus phase wets the crucible and is wicked away from the growth
region.  This decrease in the amount of the liquidus phase limits the
size of the YBa2Cu3O7 single crystals.  The wicking has been observed
with Al2O3, many orientations of sapphire, MgO, Au, etc.  The wicking
has even been used by others to grow single crystals from gold
crucibles (2).

      The liquidus phase in the 1-2-3 system is not wicked away on
the (011-2) surface of sapphire.  This surface can be used in two
ways as a crucible for the growth of YBa2Cu3O7 single crystals.  One
way is to use the (011-2) surface of sapphire, where the YBa2Cu3O7
single crystal is grown from a melt on this surface.  An alternative
crucible with a larger capacity is to use the (011-2) surface of
sapphire with a well machined into it, such that the sides of the
well are also (011-2) surfaces of sapphire.  Both triangular and
diamond (almost square)- shaped wells can be machined into the
(011-2) surface of sapphire such that the side surfaces of these
wells are also (011-2) surfaces. These are shown in the figure.  The
(01-12), (011-2), and (0112-) surfaces of sapphire are equivalent.

      References
(1)  K. G. Frase, E. G. Liniger and D. R. Clarke, IBM
      Technical Report...