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Mixed garnets of the composition Y3Fe5xGaxO12 (x = 0, 0.58, 0.91, 1.26, 2.20, 3.07) and Y3Fe5xAlxO12 (x = 0, 0.57, 1.00, 1.92, 3.20) were grown from the flux melt with application of the “induced striation method” (ISM). Growth conditions, nucleation temperatures, solubility curves, and values of the molar heat of solution are given. Some data about flux grown Gd3Ga5O12 are added. The magnetization was measured and theoretically calculated from 4.2 K up to the Curie temperature. The site occupation of Ga3+ and Al3+ has been determined according to the models of Néel, Dionne, and Gilleo. Compensation and Curie points were calculated and compared with experimental results.

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