Journal of 7*hp .4 mericun C~m m i c No. 7 tures with low Fe203 additions and then covers the entire field with higher Fep03 additions. At the same time, the upper temperature limit of stability of yttrium-iron garnet is raised sharply by the addition of Fe20a. The exact positions of the phase changes were not determined in all the ironrich solvents. For the purpose of crystal growing i t was necessary only t o know which iron addition gave the widest temperature range of stability for yttrium-iron garnet or which addition showed the widest temperature range between the Ba0.6Fez03 and the YFe03 stability ranges. Since the BaO . BFe203 boundary rises faster with increased iron than does the YFe03 boundary, low Fez03 additions gave the widest yttrium-iron garnet stability range and this was optimized a t 6.5% of Fez03 in the solvent. This solubility curve is curve B in Fig. 4 and shows that yttrium-iron garnet is stable from 995' =k 3' to 1250' = ! z 3'. The solubility varies from approximately 18 wt% at 995' to 34 wt% at 1250'. This gives a more desirable stability range and a favorable solubility slope. This curve was used for most of the crystal growing with this solvent.
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