Letter | Published:

Purification of Sodium Tungstate

Naturevolume 207page855 (1965) | Download Citation

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Abstract

SODIUM tungstate is used to provide charge compensation in neodymium-doped single crystals of calcium tungstate (scheelite) which are widely used as lasers1. These crystals are generally grown by the Czochralski technique from melts which can contain up to 10 wt. per cent sodium. It is therefore desirable to remove impurities from the sodium tungstate which could lead to the formation of light-scattering centres in laser crystals incorporating this material2. In this communication, a zone-refining method of purifying the readily available reagent grade of sodium tungstate is described.

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References

  1. 1

    Nassau, K., and Broyer, A. M., J. App. Phys., 34, 360 (1962).

  2. 2

    Cockayne, B., Robertson, D. S., and Bardsley, W., Brit. J. App. Phys., 15, 1165 (1964).

  3. 3

    Gmelins Handbuch der Anorgischer Chemie, 212–213.

  4. 4

    Cockayne, B., Sol. State Comm., 2, 381 (1964).

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Affiliations

  1. Ministry of Aviation, Royal Radar Establishment, Malvern, Worcestershire

    • M. P. GATES
    •  & B. COCKAYNE

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https://doi.org/10.1038/207855a0

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