Neodymium (III) oxide

Crystal structure
__ Nd 3+      __ O 2−
General
Surname	Neodymium (III) oxide
other names	Dineodymium trioxide Neodymium sesquioxide Neodymium oxide
Ratio formula	Nd 2 O 3
Brief description	odorless, light blue powder
External identifiers / databases
CAS number 1313-97-9 EC number 215-214-1 ECHA InfoCard 100.013.832 PubChem 159373 Wikidata Q424466
properties
Molar mass	336.48 g mol −1
Physical state	firmly
density	7.24 g cm −3 (20 ° C)
Melting point	2272 ° C
boiling point	3027 ° C
solubility	practically insoluble in water
Refractive index	1.92
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
Toxicological data	5000 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Neodymium (III) oxide is a chemical compound between the rare earth metal neodymium and oxygen and belongs to the group of metal oxides .

presentation

After the laborious separation of the other lanthanoids from their ores, neodymium oxalate is ultimately obtained, which is then burned to neodymium oxide Nd ₂ O ₃ .

${\displaystyle {\ce {2 Nd2(C2O4)3 + 3 O2 -> 2 Nd2O3 + 12 CO2}}}$

properties

Neodymium oxide

Neodymium (III) oxide has a hexagonal crystal structure of the lanthanoid A type.

use

Neodymium (III) oxide is used as a pigment for ceramics and colored or special optical glasses. It produces very warm purple to wine red and gray tones. It is z. B. also used in the glass of daylight incandescent lamps. Such glasses have sharp absorption bands and are used in astronomy for calibration and as laser material . Neodymium (III) oxide is also used for high-temperature-resistant enamel , as a component of ceramic materials or dopants , in ceramic capacitors (as a dopant of barium titanate ) and as a catalyst in rubber production. It is also used as a powder in nanotechnology.

Individual evidence

1. ↑ ^{a b c d e f} Entry for CAS no. 1313-97-9 in the GESTIS substance database of the IFA , accessed on February 3, 2013(JavaScript required) .
2. ↑ Neodymium Oxide Powder. Micron Metals, accessed October 11, 2017 . 
3. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Index of Refraction of Inorganic Crystals, pp. 10-247.
4. ↑ data sheet at Metall (English) .
5. ↑ data sheet at AmericanElements (English)