The thomsonite [12399-54-1], from Death Valley, California, is orthorhombic, space group Pncn, with a = 13.089, b = 13.047, and c = 13.218 Å. The structure was refined to a final R of 0.035. The ordering scheme for the Si-Al distribution doubles the value of the c parameter, typical of all other fibrous zeolites. The possible Si-Al distribution is discussed for samples with an Si/Al ratio >1. Two cation sites were found. One site, occupied by Ca and Na, is at the center of a regular square antiprism, which is linked to 2 equiv. polyhedrons forming a chain parallel to c. The other site, occupied by Ca and Sr, statistically distributed over 2 equiv. positions near a center of symmetry, and is 6-fold coordinated. Four H2O mols. were found at all the H atoms located. The cation distribution and the H positions were verified by electrostatic energy calcns.

Thomsonite: a detailed refinement with cross checking by crystal energy calculations / A., Alberti; Vezzalini, Maria Giovanna; V., Tazzoli. - In: ZEOLITES. - ISSN 0144-2449. - STAMPA. - 1:(1981), pp. 91-97.

Thomsonite: a detailed refinement with cross checking by crystal energy calculations

VEZZALINI, Maria Giovanna;
1981

Abstract

The thomsonite [12399-54-1], from Death Valley, California, is orthorhombic, space group Pncn, with a = 13.089, b = 13.047, and c = 13.218 Å. The structure was refined to a final R of 0.035. The ordering scheme for the Si-Al distribution doubles the value of the c parameter, typical of all other fibrous zeolites. The possible Si-Al distribution is discussed for samples with an Si/Al ratio >1. Two cation sites were found. One site, occupied by Ca and Na, is at the center of a regular square antiprism, which is linked to 2 equiv. polyhedrons forming a chain parallel to c. The other site, occupied by Ca and Sr, statistically distributed over 2 equiv. positions near a center of symmetry, and is 6-fold coordinated. Four H2O mols. were found at all the H atoms located. The cation distribution and the H positions were verified by electrostatic energy calcns.
1981
1
91
97
Thomsonite: a detailed refinement with cross checking by crystal energy calculations / A., Alberti; Vezzalini, Maria Giovanna; V., Tazzoli. - In: ZEOLITES. - ISSN 0144-2449. - STAMPA. - 1:(1981), pp. 91-97.
A., Alberti; Vezzalini, Maria Giovanna; V., Tazzoli
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/737738
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 27
  • ???jsp.display-item.citation.isi??? 30
social impact