Question

3. The radius ratios for Sro and Ba0, 0.80 and 0.96, respectively, appear to favor a CsCl structure. Why do they adopt the Nacl structure? 4: Determine that the flourite structure and the rutile structure conform to Pauling's second rule and also to the Verwey-Heilman principle of maximum charge neutralization. 5. Demonstrate that the radius ratio representing the lower "no rattle" limit for tetrahedral coordination is 0.225.

Mineralogy Questions HELP!

Answer 1

y The cesium chloride structure instead of the Nach Structure u adopted by Ax compound when the radius ralio is RAiRx which is greater than 0.73. Therefore the aniono (x) are in simple cuber of sep) and the cations fill the large interstices beth them. The onerall structure is made up of entered tubes that share faces with sin neighbouring- enbes. 4 g Anor Flusrite structure in the structure of Ca 2+ ions are arranged at the corner and face centers of the cubic unit all. Each cakt is surrounded by eight F in cubic wordination and each t- is surrounded by your cart at the corners of a tetrahedron corite structure may be derived from the escl structure replacing- el with f- and every other cut with cant. The coordination number is a form cation & 8 for anion. Rutile CTion) structure :) Hep with Te filling half te 6 for cation and a for anion. The rutite structure is based on octahedral interstics positions. CNN

5 Ansing Radius ratio of trahechal :-) A tetrahedral bite in a cube in ginen on below, - А A i ne consider the face length of the cube is a and r, and he is the raden of the f void and sphere, respectively, Now wniden right angle triangle o ABC y Face diagonal AB= Sachet Ber = Vaa on Maria [ along lingth AB, the two spheres with radion he touch each other, similarly considering another triangle ABD and the body diagonal AD-VABYT BD MD on an, tara sisa [ AD = 20,+ 2 he] Demiding equation by en we gel. 1415 1732-1416 >> =0225 This for a tetrahedral maid - Lona tehahedral veld - 38225 "sphere Birkenh Jyoti Jamuly.