Abstract
The saturation temperature, the growth rate and the crystal composition of rare-earth iron garnet films grown from a PbOBi 2O 3B 2O 3 flux were investigated. The concentrations of the garnet component oxides, the proportions of the flux oxides, B 2O 3 and Bi 2O 3, and the ratio Fe 2O 3/RE 2O 3 in the melt were systematically varied to determine their effect. The melts generally obey Van Erk's theory of solubility and growth rate. However, an increase of either the B or Bi concentration in the melt linearly decreases the rare earth activity, which results in an increase in both the garnet solubility and the effective segregation coefficient of Bi into growing garnet films. Using the rare earth activity calculated from solubility data, a Bi segregation coefficient of 0.0010 is observed that is independent of melt composition and growth temperature.
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