The first order reflection of a beam of X – rays of wavelength from the (210) plane of a crystal of the simple cubic type, occurs at an angle of 11.290, the length of the unit cell is
8.794 × 10-8 cm
1 × (1.54 × 10-8) = 2 × d × sin 11.29
d = 3.933 × 10-8 cm
= 8.794 × 10-8 cm
The density of solid argon is 1.65 g/mL at –233oC. If the argon atom is assumed to be sphere of radius 1.54 × 10–8 cm, what percentage of solid argon is apparently empty space?(At wt of Ar = 40).
A compound CuCl has fcc structure. Its density is 3.4 g cm–3, what is the length of unit cell?
A metal crystallizes into two cubic phases fcc and bcc whose unit cell lengths are 3.5 and 3.0 Å respectively. What is the ratio of densities of fcc and bcc?
The radius of a divalent cation M2+ is 94 pm and that of divalent anion X2–is 146 pm. Thus, M2+ X2– has
MgO has a structure of NaCl, the coordination number of O2– in MgO is
If NaCl is doped with 10–3 mol% of SrCl2, calculate the concentration of cation vacancies
The composition of a sample of wustite is Fe0.93 O. What percentage of the iron is present in the form of Fe III?
A solid AB has the NaCI structure. If radius of cation A+ is 120 pm, the maximum possible value of the radius of the anion B- is
CsCl crystallizes in a cubic lattice that has a Cl- at each corner and Cs+ at the centre of the unit cell. What is the value of edge length a of the cube?
KCI crystallises in the same type of lattice as does NaCI.
The ratio of the side of the unit cell for NaCI to that for KCI is