Titre du document / Document title

Thermal behavior of K₂MSi₃O₉.H₂O with the structure of umbite (M = Sn) and kostylevite (M = Pb) minerals

Auteur(s) / Author(s)

PERTIERRA Pilar ⁽¹⁾ ; SALVADO Miguel A. ⁽¹⁾ ; GARCIA-GRANDA Santiago ⁽¹⁾ ; KHAINAKOV Sergei A. ⁽²⁾ ; GARCIA José R. ⁽²⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Departamento de Química Física y Analítica, Universidad de Oviedo, 33006 Oviedo, ESPAGNE
⁽²⁾ Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo, 33006 Oviedo, ESPAGNE

Résumé / Abstract

K₂MSi₃O₉.H₂O (M = Sn, Pb) synthetic framework silicates are isotypical with umbite and kostylevite minerals, respectively. The silicate anion exhibits two structural types, one of which is an infinite chain polysilicate (umbite) and the other a cyclohexasilicate (kostylevite). The structural formulas may be written as K₂Sn{uB, 1∞¹}[³Si₃O₉]H₂O and K₄Pb₂{uB, 1r}[Si₆O₁₈]2H₂O. The thermal behavior of these compounds was determined by dynamic and isothermal thermogravimetry combined with powder X-ray diffraction between room temperature and 550 C. The kostylevite-type compound presents a very rigid framework, the umbite-type structure being much more flexible. In both cases, the dehydration process takes place with a reduction in cell volume. Anhydrous tin silicate presents a monoclinic cell whose volume is almost invariant with temperature. K₂PbSi₃O₉ is obtained as an amorphous material. The structural characteristics of these phases are related to their ion exchange properties.

Revue / Journal Title

Thermochimica acta   ISSN 0040-6031   CODEN THACAS 

Source / Source

2004, vol. 423, n^o1-2, pp. 113-119 [7 page(s) (article)] (23 ref.)

Langue / Language

Anglais
Revue : Allemand

Editeur / Publisher

Elsevier, Amsterdam, PAYS-BAS  (1970) (Revue)

Mots-clés anglais / English Keywords

Polysilicates ; X ray diffraction ; Thermogravimetry ; Thermal analysis ; Lead compound ; Tin compound ; Potassium compound ; Ion exchanger ; Silicates ; Metal ;

Mots-clés français / French Keywords

Kostylevite ; Umbite ; Polysilicate ; Diffraction RX ; Thermogravimétrie ; Analyse thermique ; Plomb composé ; Etain composé ; Potassium composé ; Echangeur ion ; Silicate ; Métal ;

Mots-clés espagnols / Spanish Keywords

Polisilicato ; Difracción RX ; Termogravimetría ; Análisis térmico ; Plomo compuesto ; Estaño compuesto ; Potasio compuesto ; Cambiador iónico ; Silicato ; Metal ;

Mots-clés d'auteur / Author Keywords

Dynamic and isothermal thermogravimetry ; Thermal powder X-ray diffraction: Metal(IV) silicates ;

Localisation / Location

INIST-CNRS, Cote INIST : 14753, 35400012040367.0150