Abstract
The composition of gadolinium-scandium-aluminium (GSAG) and yttrium-scandium-aluminium (YSAG) garnet crystals grown by the Czochralski method and by floating zone melting was analysed. It is shown that Sc3+ and Al3+ ions in GSAG and Y3+, Sc3+ and Al3+ ions in YSAG can simultaneously occupy two types of sites in the lattice. The congruent melting composition of GSAG is {Gd2.88Sc0.12} [Sc1.77Al0.23] (Al3)O12. The homogeneity range of GSAG is rather narrow. In the Y2O3-Sc2O3-Al2O3 system a wide range of garnet-structured solid solutions exist. However, there is no ternary garnet that melts congruently. Distribution coefficients of components in YSAG are slightly varied from unity in the whole concentration range, and as the melt composition approaches YAG they tend to unity. Cr3+ and Nd3+ distribution coefficients in GSAG and YSAG are presented.
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Lutts, G.B., Denisov, A.L., Zharikov, E.V. et al. GSAG and YSAG: a study on isomorphism and crystal growth. Opt Quant Electron 22 (Suppl 1), S269–S281 (1990). https://doi.org/10.1007/BF02089015
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DOI: https://doi.org/10.1007/BF02089015