pH controlled pathway and systematic hydrothermal phase diagram for elaboration of synthetic lead nickel selenites.
Fiche publication
Date publication
mars 2015
Journal
Inorganic chemistry
Auteurs
Membres identifiés du Cancéropôle Est :
Dr TERRYN Christine
Tous les auteurs :
Kovrugin VM, Colmont M, Terryn C, Colis S, Siidra OI, Krivovichev SV, Mentré O
Lien Pubmed
Résumé
The PbO-NiO-SeO2 ternary system was fully studied using constant hydrothermal conditions at 473 K. It yields the establishment of the corresponding phase diagram using a systematic assignment of reaction products by both powder and single-crystal X-ray diffraction. It leads to the preparation of three novel lead nickel selenites, α-PbNi(SeO3)2 (I), β-PbNi(SeO3)2 (II), and PbNi2(SeO2OH)2(SeO3)2 (III), and one novel lead cobalt selenite, α-PbCo(SeO3)2 (IV), which have been structurally characterized. The crystal structures of the α-forms I, IV, and III are based on a 3D complex nickel selenite frameworks, whereas the β-PbNi(SeO3)2 modification (II) consists of nickel selenite sheets stacked in a noncentrosymmetric structure, second-harmonic generation active. The pH value of the starting solution was shown to play an essential role in the reactive processes. Magnetic measurements of I, III, and IV are discussed.
Mots clés
Hot Temperature, Hydrogen-Ion Concentration, Lead, chemistry, Nickel, chemistry, Selenious Acid, chemistry
Référence
Inorg Chem. 2015 Mar 2;54(5):2425-34