Experimental and calculated RIRs of metals from ICDD

2015-06-10 Thread Leonid Solovyov
Dear Rietveldians, Can anybody give an explanation of a severe discrepancy in the experimentally measured Reference Intensity Ratios (RIR) and those calculated from structure for some metals, such as Zn, Ti, Cd etc. in the ICDD PDF? In particular for Zn, the experimental RIR from ICDD PDF 00-0

Re: Unit cell accessible volume

2015-06-10 Thread Leonid Solovyov
>I am, however, interested in finding out >whether inserting certain molecules >in the voids (without distorting the structure) >is geometrically possible. You may use FOX: http://fox.vincefn.net/ There you can insert guest molecules into the structure cell, set up their flexibility (or use as ri

Re: Unit cell accessible volume

2015-06-10 Thread Lubomir Smrcok
Hi, Platon provides a reliable estimate of volumes of voids. However, it does not, in fact it can't, tell you more about their shapes. But what is known are approximate volumes taken in structures by typical molecules, mostly by solvents. Of course, some flexible molecules could happen to be a

RE: Unit cell accessible volume

2015-06-10 Thread Alan Coelho
Hi Othman >I am, however, interested in finding out whether inserting certain molecules in the voids >(without distorting the structure) is geometrically possible Use distance penalties/restraints such anti-bumping etc. and then minimize on the restraints/penalties by refining the molecul

Unit cell accessible volume

2015-06-10 Thread Othman Al Bahri
Dear all, I am trying to calculate the void volume in a unit cell. I can estimate the overall void volume manually by subtracting the occupied space volume from the total unit cell volume using VESTA. I am, however, interested in finding out whether inserting certain molecules in the voids (wi