Yttrium thermal properties

The exceptional properties of the alloy are due in no small way to the yttrium component which together with the aluminium forms a stable and firmly bound oxide layer that exhibits excellent resistance to exhaust gas emissions at high temperatures over prolonged periods.( ) At the same time, it provides an ideal surface to receive another coating of metal or metal oxide which, in the context of catalyst applications, is most essential. At the present time most catalytic convertors utilise ceramic substrates which are prone to damage by both mechanical and thermal shock. 

Al-Yassir, N. and Le Van Mao, R., Thermal stabihty of alumina aerogel doped with yttrium oxide, used as a catalyst support for the thermocatalytic cracking (TCC) process An investigation of its textural and structural properties, Appl. Catal. A, 317, 275, 2007. 

Generally, aluminate phosphors with high luminescence efficiency and excellent thermal stabilities have attracted increasing attention. Typically, Ce -doped yttrium aluminum garnet Y3Al50i2 Ce (YAG Ce ) yellow-emitting phosphor has excellent properties and is widely used to generate w-LEDs. 

Compared with the high symmetry of site, the asymmetrical fields have a drastic influence on the spectroscopic properties of Bi ". The lowest excitation level shifts toward higher energy, whereas the Stokes shift increases. The Se site has better resistance to thermal impact than the C2 site at higher temperature [57]. A similar conclusion was reported in Bi -doped yttrium or gadolinium niobates [58]. 

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