Garnets gallium garnet Yttrium aluminum

Carnets. Both YAG, yttrium aluminum garnet. YjAIsOi3, and GGG, gadolinium gallium garnet. GdiGa 0,2. have the garnet structure and were used al one time as diamond imitations. These have been supplanted by cubic zirconia. 

Cherniak D. J. (1998) Rare earth element and gallium diffusion in yttrium aluminum garnet. Phys. Chem. Mineral. 26, 156-163. 

The absorption due to relaxation between the possible directions of the Jahn-Teller distortions was observed initially in experiments done on the crystals of aluminum oxide (corundum), yttrium aluminum garnet, yttrium iron garnet, and lithium gallium spinel doped with 2>d ions [10,11]. 

Now we will overview some experiments that reveal the specificities of the Jahn-Teller effect in diluted crystals. First of all, we will discuss a justification of their relaxation origin. We have mentioned before that the first experiments were done on the crystals of aluminum oxide (corundum), yttrium aluminum garnet, yttrium iron garnet, and lithium gallium spinel doped with a number of 3d ions [10,11]. The main result was the discovery of attenuation maximum which was considered to be observed at cot 1 and reconstruction of the relaxation time temperature dependence. In some experiments reported later both the velocity and attenuation of ultrasound were measured as functions of the temperature. They were done on ZnSe and ZnTe crystals doped with transition metals. These crystals have the zinc-blende structure with the Jahn-Teller ion in tetrahedral coordination. The following... 

J.E. Geusic, H.M. Marcos, and V.U. L.G., Laser oscillations in Nd-doped yttrium aluminum, yttrium gallium, and gadolinium garnets. App. Phys. Lett. 4, 182-184 (1964). 

The diffusion of gallium was studied in yttrium aluminum garnet. The source of the diffusant was a mixture of gallium and yttrium oxides. The diffusion profiles were measured using Rutherford back-scattering spectrometry. The Arrhenius relationship... 

Different assumptions and approximations are commonly used in considering RHT problems in crystal growth. In an effort to study the effects of internal radiation within yttrium aluminum garnet (YAG) and gadolinium gallium garnet (GGG), Xiao and Derby [7, 8] assumed that the crystal is totally transparent and... 

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