Characterization of trace Nd and Ce site preference and coordination in natural melanites: a combined X-ray diffraction and high-energy XAFS study (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• Characterization of trace Nd and Ce site preference and coordination in natural melanites: a combined X-ray diffraction and high-energy XAFS study (Articolo in rivista) (literal)

Anno

• 2002-01-01T00:00:00+01:00 (literal)

Alternative label

• S. Quartieri;? F. Boscherini;? J. Chaboy; ? M.C. Dalconi;R. Oberti;? A. Zanetti (2002)
  Characterization of trace Nd and Ce site preference and coordination in natural melanites: a combined X-ray diffraction and high-energy XAFS study
  in Physics and chemistry of minerals
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• S. Quartieri;? F. Boscherini;? J. Chaboy; ? M.C. Dalconi;R. Oberti;? A. Zanetti (literal)

Pagina inizio

• 495 (literal)

Pagina fine

• 502 (literal)

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• 29 (literal)

Rivista

• Physics and chemistry of minerals (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

• 8 (literal)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• Dipartimento di Scienze della Terra, Salita Sperone 31, 98166 Messina S.Agata, Italy; Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica, Universita` di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy;and Departamento de Fisica de la Materia Condensada, Universidad de Zaragoza, Plaza S. Francisco s/n. 50009 Zaragoza, Spain; Istituto di Mineralogia, C.so Ercole Io d'Este 32, 44100 Ferrara, Italy; Centro di Studio per la Cristallochimica e la Cristallografia, CNR, via Ferrata 1, 27100 Pavia, Italy (literal)

Titolo

• Characterization of trace Nd and Ce site preference and coordination in natural melanites: a combined X-ray diffraction and high-energy XAFS study (literal)

Abstract

• Abstract Natural melanite garnets from carbonatitic rocks have beenstud ied by a multitechnique approach based onboth experimental (chemical, diffractometric and spectroscopic) methods and full-multiple scattering calculations of the X-ray absorption near-edge structure. Inparti cular, the site location and geometry of trace amounts of neodimium (from 176 to 1074 ppm) and cerium (791 ppm) in natural garnets have been studied by fluorescence-detected X-ray absorption fine-structure spectroscopy (XAFS) at high energy. The measurements, done at both Nd K (43569 eV) and Ce K (40443 eV) edges, demonstrate that, in all the samples, the trace elements are located in the dodecahedral X site and not in ill-defined defects. The local geometry around the two rare-earth elements is compatible with their ionic radius and is compared with that of Ca, the major element at the X site, as determined by single-crystal X-ray diffractiondata. This work represents the first example of direct investigation of trace-level REE coordination in natural garnets, and confirms the great relevance for the Earth Sciences of the use of fluorescence XAFS at high energy. (literal)

Prodotto di

• Metodologie integrate per la conoscenza di processi e materiali geologici e del loro impatto sull'uomo e l'ambiente (TA.P04.014.002) (Modulo)
• Istituto di geoscienze e georisorse (IGG) (Istituto)

Autore CNR

• ALBERTO ZANETTI (Persona)
• ROBERTA MARIA OBERTI (Persona)

Insieme di parole chiave

• Keywords of "Characterization of trace Nd and Ce site preference and coordination in natural melanites: a combined X-ray diffraction and high-energy XAFS study" (Insieme di parole chiave)

Incoming links:

Autore CNR di

• ROBERTA MARIA OBERTI (Persona)
• ALBERTO ZANETTI (Persona)

Prodotto

• Istituto di geoscienze e georisorse (IGG) (Istituto)
• Metodologie integrate per la conoscenza di processi e materiali geologici e del loro impatto sull'uomo e l'ambiente (TA.P04.014.002) (Modulo)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Physics and chemistry of minerals (Rivista)

Insieme di parole chiave di

• Keywords of "Characterization of trace Nd and Ce site preference and coordination in natural melanites: a combined X-ray diffraction and high-energy XAFS study" (Insieme di parole chiave)