Hi everybody, thanks for your time, knowledge and pacience. The first shell is can be fitted by 2 sub shells with this composition: n_first_1 = 2.4702860 r = 1.782161 n_first_2 = 9.2476950 r = 2.342539 This is really far from Zn in ZnO, is closer to Er(OH)3, with 8 between 2.40 and 2.43 and ErOOH presents 7 neighbors between 2.26 and 2.45, with something like 2 sub-shells. Er2O3 has two sites with octahedral simmetry, one is perfectly Oh and the other distorted with 2.21 to 2.36 for Er-O. I chequed the doping element incorporation and found that what I suppose to be 1% is in fact 0.6% (by ICP quantification) the incorporation is less I though. Maybe that is the reason to do not find call parameters change. What kind of difference could I find between nanoparticles and bulk for incorporation? Cheers, euG -- "I posti più caldi nell'inferno sono riservati a coloro che in tempo di grandi crisi morali mantengono la propria neutralità". Dante Alighieri (1265-1321) 8<- - - - - - 8<- - - - - - 8<- - - - - - 8<- - - - - - Lic. Eugenio H. Otal CINSO - CONICET - CITEFA San Juan Bautista de La Salle 4397. Villa Martelli (B1603 ALO) Buenos Aires TEL: 54 11 4709-8100 Int. 1212. FAX: 54 11 709-8241. E-mail: eotal@citefa.gov.ar eugenioh@gmail.com 8<- - - - - - 8<- - - - - - 8<- - - - - - 8<- - - - - -