2006-11-15 00:29:00 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
binary oxides are majorly formed by the lanthanide elements
these are used in the solid state physics ,these have optical properties as well as dielectric properties.
2006-11-15 00:41:40 · answer #1 · answered by santhosh 1 · 0⤊ 0⤋
Binary Oxides
Ln2O3
The most common lanthanide oxide (notable exceptions; CeO2, Pr6O11, Tb4O7)
Sesquioxides, Ln2O3, adopt three structure types
Strongly Basic
Absorb water / CO2 from air Æ hydroxide / carbonate salts
Pale colours
Properties strongly resemble alkaline earth oxides
A-type
light Ln
unusual LnO7 capped-octahedra
http://www.chem.ox.ac.uk/icl/heyes/LanthAct/L12.html
2006-11-15 00:34:54 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Ln2O3
The most common lanthanide oxide (notable exceptions; CeO2, Pr6O11, Tb4O7)
Sesquioxides, Ln2O3, adopt three structure types
Strongly Basic
Absorb water / CO2 from air Æ hydroxide / carbonate salts
Pale colours
Properties strongly resemble alkaline earth oxides
A-type
light Ln
unusual LnO7 capped-octahedra
B-type
middle Ln
LnO7 units of three types:
2 x capped trigonal prisms
1 x capped octahedron
B-M2O3 structure is very complex
Densest of M2O3 structure types Þ favoured by increased pressure
C-type
heavy Ln
LnO6 units, but not octahedra
(face & body - divacant cubic)
C-type M2O3 is related to Fluorite (MO2) with 1/4 of anions removed
A (high T)
B (medium T)
C (low T)
obtained by action of conc. NaOH on Ln2O3 under hydrothermal conditions
9-coordinate Ln with tricapped trigonal prismatic (ttp) geometry
basicity increases with Z - correlates with decrease in r(Ln3+)
2006-11-15 23:16:07 · answer #3 · answered by veerabhadrasarma m 7 · 0⤊ 0⤋
Oxides like this: (Mn, Fe)O
2006-11-15 03:30:27 · answer #4 · answered by Juan D 3 · 0⤊ 0⤋