For example, sodium silicide, Na 2 Si, reacts rapidly with water to yield sodium silicate, Na 2 SiO 3, and hydrogen gas.
32.
Silicides have largely replaced Al in part because the more refractory materials are less prone to diffuse into unintended areas especially during subsequent high-temperature processing.
33.
Since degenerate semiconductors exhibit some metallic properties, such as luster and electrical conductivity which decreases with temperature, some silicides classified as metals may be semiconductors.
34.
In general, the alkaline-earth metals form silicides with the following stoichiometries : M II 2 Si, M II Si, and M II Si 2.
35.
"' Zirconium ( IV ) silicide "'is an inorganic chemical compound with the chemical formula ZrSi 2, consisting of zirconium and silicon atoms.
36.
Thorium borides, carbides, silicides, and nitrides are refractory materials, as are those of uranium and plutonium, and have thus received attention as possible nuclear fuels.
37.
In all cases, these substances react with Br�nsted Lowry acids to produce some type of hydride of silicon that is dependent on the Si anion connectivity in the silicide.
38.
For classroom demonstrations, silane can be produced by heating sand with magnesium powder to produce magnesium silicide ( Mg 2 Si ), then pouring the mixture into hydrochloric acid.
39.
However, in all cases these substances react with Br�nsted Lowry acids to produce some type of hydride of silicon that is dependent on the Si anion connectivity in the silicide.
40.
A polysilicon gate's electrical conductivity may be increased by depositing a metal ( such as tungsten ) or a metal silicide ( such as tungsten silicide ) over the gate.
