Crystal structure and temperature-resolved powder diffractometry of Cd sub 5 (OH) sub 8 (NO sub 3 ) sub 2 ter dot 2H sub 2 O
- Universite de Rennes I (France)
A new cadmium hydroxide nitrate Cd{sub 5}(OH){sub 8}(NO{sub 3}){sub 2} {center dot} 2H{sub 2}O was prepared by an interdiffusion method. It is monoclinic with the cell parameters a=18.931(3) {angstrom}, b=6.858(2) {angstrom}, c=5.931(1) {angstrom}, {beta}=94.85(2){degree}; the space group is C2/m with Z=2. The crystal structure has been solved from single-crystal data by means of Patterson and Fourier synthesis (R=0.043,2218hkl). The structure, related to the brucite type, is built up from OH{sup -} ion layers parallel to (100) with 3/4 of the octahedral holes filled with cadmium atoms. The remaining metal atoms are located above and below the empty octahedral sites; they are sixfold coordinated by three OH{sup -}, one water molecule, and one bidentate nitrate group. The thermal decomposition of this compound was investigated by means of TRXD and TG methods. It proceeds in four or three stages, depending upon the environmental atmosphere. Under vacuum, the hemihydrate Cd{sub 5}(OH){sub 8}(NO{sub 3}){sub 2} {center dot} 0.5H{sub 2}O is obtained during the first stage, whereas a new anhydrous hydroxide nitrate is displayed in the second one.
- OSTI ID:
- 5488059
- Journal Information:
- Journal of Solid State Chemistry; (USA), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 91:2; ISSN 0022-4596; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602* -- Other Materials-- Structure & Phase Studies
CADMIUM COMPOUNDS
CADMIUM HYDROXIDES
CADMIUM NITRATES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
LATTICE PARAMETERS
MONOCLINIC LATTICES
NITRATES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXYGEN COMPOUNDS
SCATTERING
SPACE GROUPS
THERMAL DEGRADATION
X-RAY DIFFRACTION