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The binary phase diagram of the YAlO 3 (YAP) -NdAlO 3 (NAP) system was determined by differential thermal analysis (DTA) and X-ray powder diffraction (XRD) measurements. High purity nanocrystalline powders and small single crystals of Y 1-x Nd x AlO 3 (0 ≤ x ≤1) have been produced successfully by modified sol-gel (Pechini) and micro-pulling-down methods, respectively. Both end members show high mutual solubility > 25% in the solid phase, with a miscibility gap for intermediate compositions. A solid solution with x ≈ 0.2 melts azeotropic ca. 20 degrees below pure YAP. Such crystals can be grown from the melt without segregation. The narrow solid/liquid region near the azeotrope point could be measured with a "cycling" DTA measurement technique.

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