Cation segregation to yttrium aluminum garnet (111) surfaces

Dielectric relaxations in undoped, Ce-doped and Ce,Zr-codoped Lu3Al5O12 single crystals

“…The dipoles detected in our experiments are [(F + ) 0 À(O À ) ], in Kroger-Vink notation. Since LuAG has the garnet cubic structure where distorted oxygen polyhedra are corner shared, i.e., each octahedron is connected to six tetrahedra and each tetrahedron to four octahedra, Lu atoms reside in the dodecahedral interstices formed by this network [37,38]. The oxygen octahedron is distorted with two types of distinct bond lengths of 2.848 and 2.632 Å .…”

On the deposition of Cr3−O4 spinel particles upon laser-heated pedestal growth of Cr:YAG fiber

“…Solid-state annealing the YAG fibers at 900-1300 1C in air caused electrostatically driven segregation of Ca, but not Cr, in ppm level to the {1 1 1} surfaces [17]. Here we report the growthspeed-dependent deposition of micrometer-sized refractory oxide particles on the side surface of Cr 4+ :YAG crystal fiber codoped with Ca 2+ and grown in [1 1 1] direction.…”

Exploring the Impact of Nanorod Diameter on Near Infrared Laser-Induced Stokes and Anti-Stokes Emission in La1–xNdxAlO3

“…Most likely, the change in chemical compositions caused a change in the type and average density of surface defects, which are centers of nonradiative relaxation processes. It was previously shown that changing the type and/or concentration of dopants changes the redistributions of defects located near the surface. , It is likely because an increase in the concentration of Nd 3+ ions lead to a decrease in the efficiency of energy transfer from LIWE absorbing centers (Nd 2+ /Nd 3+ mixed valence pair) to structural defects. A similar explanation can be proposed for samples of different sizes.…”