Lithium niobate wafers with narrow distribution of surface acoustic wave properties
AssigneeCrystal Technology, Inc.
InventorsDieter Hans Jundt, Maria Claudia Custodio Kajiyama, John Thomas Carella
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Abstract
A method is provided of growing crystals from compounds that melt congruently with negligible volatilization. The composition of one or more crystal samples is measured. A determination is made of a deviation of crystal composition from congruency. A determination is made of an initial melt composition and a source material composition correction relative to the deviation. Crystals are grown using the composition correction to yield reproducible material for surface acoustic substrate manufacturing.
Claims13
A method of growing crystals from congruently melting compounds with negligible volatilization, comprising:
- establishing a model that predicts crystal composition variations by using a distribution coefficient as a function of slight deviations from congruency in melt composition;
- measuring the composition of one or more crystal samples made from an initial melt composition and determine a deviation of crystal composition from congruency;
- determining a source material composition correction to the initial melt composition based on the measured deviation and the model by using the distribution coefficient as the function of slight deviations from congruency in melt composition;
- and
- growing crystals using the source material composition correction to yield reproducible material for consistent surface acoustic wave (SAW) substrate manufacturing.
The method of claim3, further comprising:
- growing one or more test crystals from Nb2O5 and Li2CO3 reacted powders.
Dependencies are inferred from the claim text.