If filter paper is used, it is transferred to a tared porcelain crucible and the paper is gradually dried and eventually charred and expelled as CO2 and H2O vapor. If the ashing process is done in an oxygen-deficient atmosphere carbon from the paper will reduce the BaSO4 to BaS. BaSO4+...
During the cooling process, as the equilibrium recovery is limited by temperature and time, the oxygen deficiencies formed at high temperatures are frozen down to form the donor energy level. For the donor-doped BaTiO3, the donor element should be selected with an ionic radius similar to that ...
is slowly withdrawn from the melt. Because of its low melting point barium is readily purified by vacuum distillation. Barium metal is used as a ‘getter’, i.e., a compound added to a system to seek out the last traces of oxygen; and as an alloy constituent for certain bearing metals...
3. Use and Manufacturing3.1 Description Barium zirconate, with the chemical formula BaZrO3, has the CAS number 12009-21-1. It is a white crystalline solid with no distinct odor. Its basic structure consists of a barium ion bonded to a zirconium ion and three oxygen ions. Barium zirconate ...
This page designed print cleanly without extraneous menus, ads, etc. and may make a great classroom handout. This page may benefit from setting your browser to print background colors.Chemical Database Barium Sulfate Identifications Formula: BaSO4 Elements: Barium, Oxygen, Sulfur CAS Number: 7727...
A method is provided of preparing an impregnated cathode with enhanced thionic emission from a porous billet by impregnating the billet with a suitable impregnant in the presence of an oxygen deficient compound.Louis E. BranovichDonald W. Eckart...
oxygens leads to the shortening of Pb-O bonds22in comparison to Ba-O bonds31, which manifests itself in an off-center shift of Pb2+toward one of the oxygen vertices22(Fig.SI2–1b, bottom). This, in turn, leads to a distortion of the ionic surroundings, redistribution of electron ...
In the presence of oxygen the stoichiometrically mixed oxalates decompose by forming TiO 2 and BaCO 3 as intermediates. Under vacuum, two routes of decomposition occur in parallel. In one route, TiO 2 and BaCO 3 are formed as intermediates; in the other, partially reduced TiO x (x < 2)...
The structure was solved by Patterson and Fourier methods and refined by the method of least squares to R 0.064. Rotational disorder of the trifluoromethyl groups was found. This compound is a guest-host complex formed due to cooperative bonding of barium hexafluoroacetylacetonate by the oxygen ...
The ionic transport number of BaCe 1-x Gd x O 3- x 2 (x=0.10) was studied by measurement of the total conductivity versus P O2 and the EMF of oxygen and hydrogen concentration cells. At high temperature and at high oxygen partial pressure this compound is a mixed ionic and p-type ...