pH controlled pathway and systematic hydrothermal phase diagram for elaboration of synthetic lead nickel selenites.
Inorg Chem
; 54(5): 2425-34, 2015 Mar 02.
Article
in En
| MEDLINE
| ID: mdl-25689274
ABSTRACT
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), ß-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 ß-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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Selenious Acid
/
Hot Temperature
/
Lead
/
Nickel
Language:
En
Journal:
Inorg Chem
Year:
2015
Document type:
Article
Affiliation country:
France
Country of publication:
EEUU
/
ESTADOS UNIDOS
/
ESTADOS UNIDOS DA AMERICA
/
EUA
/
UNITED STATES
/
UNITED STATES OF AMERICA
/
US
/
USA