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Different route of hydroxide incorporation and thermal stability of new type of water clathrate: X-ray single crystal and Raman investigation.


ABSTRACT: Chlormayenite Ca12Al14O32[♦4Cl2] (♦-vacancy) is partially hydrated micro porouss mineral with hydroxide groups situated at various crystallographic sites. There are few mechanisms describing its hydration. The first one assumes Cl- substitution by OH- at the center of the structural cages (W-site). The second one determines the converting a T1O4 tetrahedron to a T1O3(OH)3 octahedron due to the replacement of oxygen at the O2 site by three OH-groups according to the scheme: (O2O2- +  W Cl-) → 3 ×  O2aOH. The third mechanism, not considered so far in the case of zeolite-like minerals, includes the hydroxide incorporation in form of hydrogarnet defect due to the arrangement of tetrahedral (OH)4 in vacant cages. This yields a strong hydrated phase containing even up to 35% of water more than in any currently known mineral applicable to Portland cement. Moreover, water molecules present in different structural cages are stable up to 355 K while dehydroxylation linked to the gradual loss of only 8% of OH- groups according to 3 O2aOH- → O2O2- + W OH- + gH2O occurs at temperature range from 355 K to 598 K.

SUBMITTER: Dulski M 

PROVIDER: S-EPMC5567383 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature

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Different route of hydroxide incorporation and thermal stability of new type of water clathrate: X-ray single crystal and Raman investigation.

Dulski Mateusz M   Marzec Katarzyna M KM   Kusz Joachim J   Galuskina Irina I   Majzner Katarzyna K   Galuskin Evgeny E  

Scientific reports 20170822 1


Chlormayenite Ca<sub>12</sub>Al<sub>14</sub>O<sub>32</sub>[♦<sub>4</sub>Cl<sub>2</sub>] (♦-vacancy) is partially hydrated micro porouss mineral with hydroxide groups situated at various crystallographic sites. There are few mechanisms describing its hydration. The first one assumes Cl<sup>-</sup> substitution by OH<sup>-</sup> at the center of the structural cages (W-site). The second one determines the converting a T1O<sub>4</sub> tetrahedron to a T1O<sub>3</sub>(OH)<sub>3</sub> octahedron due  ...[more]

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