here you are some of the cif files you need

You can get quite a number of cif files from the Crystallographic Open Database. This is a fantastic free resource.

http://www.crystallography.net/index.php 

You could also try the American Mineralogist Crystal Structure Database.

http://rruff.geo.arizona.edu/AMS/amcsd.php

for γ-Al2O3, I have the Crystallographic Information File.

Dear Aditi, you seem to be looking at calcium-aluminate cement (CAC) phases. You may find a lot of information in: Pöllmann, H (2012): Calcium aluminate cement - raw materials, differences, hydration, and properties. In: Broekmans, MATM, and Pöllmann, H (editors): Applied mineralogy of cement and concrete. Reviews in Mineralogy and Geochemistry (74): 1-82.

Herbert Pöllmann also maintains a structure database specifically for CAC phases.

here you are some of the cif files you need

Can YOU please send me the CIF File for Ca3Al10O18

Can someone provide me the cif file of TiAl6V4? Thanks in advanced