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Dominant species
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Monazite-Ce
Monazite-Ce
Chemical
Formula
Ce,La,Nd,ThPO4
Species
Phosphates
Crystal
System
Monoclinic
Mohs
Scale
5
Specific
Gravity
5.4
Color
Yellowish, reddish brown to brown; shades of greenish, nearly white; yellowish brown, yellow, colourless in transmitted light.
Streak
White, faintly coloured.
Luster
Sub-Adamantine, Vitreous, Resinous, Waxy
Refractive
Index
n = 1.770 - 1.793 n = 1.778 - 1.800 n = 1.823 - 1.860
Diaphaneity
Translucent
Cleavage
Distinct/GoodOn , distinct; on , difficult; also on , , and , indistinct as observed at times.
Fracture
Irregular/Uneven, Conchoidal
Geological Setting:Pegmatites associated with granitic or syenitic igneous rocks.
 Monazite element symbol: Ce;

Name:Cerium;
 
Relative atomic mass: 140.12; common valence: +3, +4 electronegativity: 1.12
 
Peripheral electron configuration: 4f15d16s2; arrangement of extranuclear electrons: 2,8,18,20,8,2
 
Isotopes and radiation: Ce-134[3016d]Ce-136Ce-138Ce-139[137.6d]*Ce-140Ce-141[32.5d]Ce-142Ce-143[1.4d]Ce-144[284.6d]
 
Electron affinity and can: 0KJ ·mol-1
 
The first ionization energy: 528KJ ·mol-1; second ionization energy: 1047KJ· mol-1; third ionization energy: 1880KJ· mol-1
 
Single density: 6.773g/cm3; elemental melting point: 795 ℃boiling point: 3257℃Elemental
 
Atomic radius: 2.7; Egypt ion radius: 1.14 ( +3 ); covalent radius: 1.65 angstroms.
 
Common compounds: CeO2CeCl3
 
The application of cerium
 
1) additive
 
Cerium glass additive, can absorb ultraviolet and infrared rays, is now widely used in automotive glass. Not only UV, also can reduce the temperature inside the vehicle, thereby saving air-conditioning electricity. Since 1997, Japan automobile glass full adding cerium oxide, 1996 for the automotive glass cerium oxide having at least 2000 tons, about 1000 tons of the United States of america.
 
Purifying agent
 
Cerium is currently applied to automobile exhaust purification catalyst, which can effectively prevent the large number of automotive exhaust gas into the air. The United States of America in this regard consumption accounts for 1/3 of the total consumption of heavy rare earth.
 
2) compounds
 
Cerium sulphide can replace the lead, cadmium and other harmful to the environment and human beings metal is applied to the pigments, for coloring plastics, can also be used for coatings, inks and paper industries. The leading French Rhone Planck company.
 
Detection agent

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