21.15 Suggest why Co304 adopts a normal rather than inverse spinel structure.
Magnitite ( Fe3O4) is a naturally occurring ferrimagnetic material with an inverse spinel structure . Outline how the Fe3O4 unit attains an average of 1.33 unpaired electrons per iron center.
9. A spinel is an oxide with the general formula A"B":04. The crystal structure is a close-packed array of oxide ions with the A and B metal ions occupying the holes in the lattice. If A occupies the tetrahedral holes and B the octahedral holes, the spinel is said to be normal, but if the A ions are in the octahedral holes and B in both kinds, the spinel is said to be inverse. When transition metal ions are involved,...
Why must X-rays be used in crystal structure determinations rather than visible light? Why must the light used in crystal structure determinations be monochromatic? That is, what would happen to a peak in an XRD pattern if polychromatic rather than monochromatic light were used?
a)Distinguish between actual and normal costing. Why might a company use normal rather than actual costing?
The class of organic molecules defined by a physical property rather than a structure are the: A. Carbohydrates B. Nucleic acids C. Proteins D. Lipids
Why use a forwards contract rather than a futures contract?
14. Why should you run a distillation of two liquid rather slowly than wo liquid rather slowly than more rapidly? 15. What would be the effect of lowering pressure on distillation?
2. (a) Rutile, the high-temperature form of titanium oxide, TiO2, adopts a tetragonal P structure with a 4.59 Å and c 2.96 Å Calculate the separation between the planes with the Miller indices (11). 110 (b) When radiation of wavelength 495 nm from a monochromatic flash lamp of power 0.500 kW is used to irradiate a low-pressure sample of iodine vapour, I2, the rate of production of iodine atoms is 3.24 x 1019 s 1. Assuming that all of the...
The reaction of the initiaior with the styrene m box as the major product rather than the alternato structure. Explain why, giving two different spocific reasons relatod to the clectronic nature (not steric effects) of the product. [4 pts) 2. onomer givos the structure in the In NOT In ini
The __________ structure indexes page table entries by frame number rather than by virtual page number. hash table segment table page table inverted page table