01525nas a2200193   4500008004100000022001400041245009700055210006900152260007300221300001200294490000800306520079100314653001001105653003101115653001701146100002001163700002001183856012801203       2010                        eng d  a1387-181100aEnhanced negative thermal expansion in MFI molecular sieves by varying framework composition0 aEnhanced negative thermal expansion in MFI molecular sieves by v  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAY  a322-3260 v1303 a<p>In the present investigations we have carried out the high temperature X-ray diffraction (HTXRD) studies on the metallosilicate molecular sieves iron silicalite-1 (FeS-1) samples of different Si/M ratios (Si/Fe = 50, 75, 100 and infinity) for their negative thermal expansion (NTE) behavior. All the samples exhibit NTE behavior in the temperature range 373-773 K. Systematic increase in negative thermal expansion coefficient is observed as a function of increasing Fe content in the MFI framework. Strength of the negative thermal expansion increases in the order Si/Fe = infinity &lt; 100 &lt; 75 &lt; 50. It is concluded that by changing the composition of the framework of MFI, enhanced negative thermal expansion can be obtained. (C) 2009 Elsevier Inc. All rights reserved.</p>10aHTXRD10aNegative thermal expansion10aSilicalite-11 aBhange, Deu, S.1 aRamaswamy, Veda  uhttps://library.ncl.res.in/content/enhanced-negative-thermal-expansion-mfi-molecular-sieves-varying-framework-composition-0