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- W2053897765 abstract "The reaction scheme of thermal decomposition for four zinc hydroxynitrates was investigated by means of differential scanning calorimetry, thermogravimetry, mass spectrometry, and radiocrystallography. The thermal transformation of Zn(OH)(NO3) · H2O and of Zn3(OH)4(NO3)2 involves the formation of gaseous water and nitric acid from an actual chemical reaction. This reaction is not observed for Zn5(OH)8(NO3)2 · 2H2O and Zn5(OH)8(NO3)2. These results show that the formation of gaseous nitric acid molecules inside the solids is specific to hydroxynitrates of divalent metals M, whose lamellar crystalline structure is characterized by a stacking of hexagonal close-packed layers of formula MX2+m, where m = 0 or 1 and X = OH−, H2O, or NO−3. Les analyses calorimétrique, thermogravimétrique, radiocristallographique et la spectrométrie de masse ont permis de mettre en évidence les schémas de décomposition thermique de quatre hydroxynitrates de zinc: Zn(OH)(NO3),H2O; Zn3(OH)4(NO3)2; Zn5(OH)8(NO3)2,2H2O et Zn5(OH)8(NO3)2. Il est montré que pour les deux premiers les transformations thermiques se produisent avec formation de molécules gazeuses d'eau et d'acide nitrique, résultant de véritables réactions chimiques au sein des solides. Ces caractéristiques ne sont pas observées pour les deux autres hydroxysels. Il est montré que la formation de molécules d'acide nitrique est spécifique des hydroxynitrates de métaux bivalents M dont la structure lamellaire est constituée de feuillets de type hexagonal compact de formule MX2+m, avec m entier ou nul et X = OH−, H2O ou NO−3." @default.
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- W2053897765 date "1983-02-01" @default.
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- W2053897765 title "Etude thermodynamique de la décomposition thermique des hydroxynitrates de zinc" @default.
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- W2053897765 doi "https://doi.org/10.1016/0022-4596(83)90148-2" @default.
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