Crystal structure and phase transitions in β -NH3(CH2)2NH3HPO4
Identifieur interne : 001123 ( Main/Exploration ); précédent : 001122; suivant : 001124Crystal structure and phase transitions in β -NH3(CH2)2NH3HPO4
Auteurs : S. Chaabouni [Tunisie] ; S. Kamoun [Tunisie]Source :
- Journal of Alloys and Compounds [ 0925-8388 ] ; 1995.
Abstract
Chemical preparation and main crystallographic, calorimetric, dielectric and structural features are given for a new monophosphate. β-NH3(CH2)2NH3HPO4 salt is monoclinic P21/c with unit cell dimensions a = 10.189(2); b = 7.881(1); c = 8.021(1) A ̊; β = 92.11(1)°; Z = 4; Dm = 1.604 Mg m−3; Dx = 1.632 Mg m−3; μ = 1.945 mm−1; F(000) = 336; T = 298 K; R = 0.044 and Rw 0.047 for 1773 observed reflexions. The examination of the structure shows a layer arrangement; planes of HPO42− alternate with planes of [(CH2)2(NH3)2]2+. These planes are linked together through hydrogen bonds. Physical measurements carried out at high temperature show clearly that the β variety presents calorimetric and dielectric behaviours different from those observed for the α variety.
Url:
DOI: 10.1016/0925-8388(95)01553-1
Affiliations:
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<front><div type="abstract" xml:lang="en">Chemical preparation and main crystallographic, calorimetric, dielectric and structural features are given for a new monophosphate. β-NH3(CH2)2NH3HPO4 salt is monoclinic P21/c with unit cell dimensions a = 10.189(2); b = 7.881(1); c = 8.021(1) A ̊; β = 92.11(1)°; Z = 4; Dm = 1.604 Mg m−3; Dx = 1.632 Mg m−3; μ = 1.945 mm−1; F(000) = 336; T = 298 K; R = 0.044 and Rw 0.047 for 1773 observed reflexions. The examination of the structure shows a layer arrangement; planes of HPO42− alternate with planes of [(CH2)2(NH3)2]2+. These planes are linked together through hydrogen bonds. Physical measurements carried out at high temperature show clearly that the β variety presents calorimetric and dielectric behaviours different from those observed for the α variety.</div>
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