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Specialty Compounds RTP Company

Aluminum Oxyhydroxide, AlO(OH), Boehmite
Categories: Ceramic; Oxide; Aluminum Oxide

Material Notes: CAS Number: 14457-84-2

Physical Form: Orthorhombic Crystals

Key Words: Aluminum Oxyhydroxide
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Physical PropertiesMetricEnglishComments
Density 3.44 g/cc0.124 lb/in³
a Lattice Constant 2.868 Å2.868 Å
b Lattice Constant 12.23 Å12.23 Å
c Lattice Constant 3.692 Å3.692 Å
Formula Units/Cell (Z) 44
Molecular Weight 59.989 g/mol59.989 g/mol
 
Chemical PropertiesMetricEnglishComments
Molar Volume 19.55 cc/mol19.55 cc/mol
 
Mechanical PropertiesMetricEnglishComments
Hardness, Mohs 3.5 - 43.5 - 4
 
Electrical PropertiesMetricEnglishComments
Magnetic Susceptibility -3.70e-7-3.70e-7
 
Thermal PropertiesMetricEnglishComments
Specific Heat Capacity  0.840 J/g-°C
@Temperature 24.9 °C
0.201 BTU/lb-°F
@Temperature 76.7 °F
Calculated
 1.04 J/g-°C
@Temperature 127 °C
0.249 BTU/lb-°F
@Temperature 260 °F
Calculated
 1.09 J/g-°C
@Temperature 25.0 °C
0.261 BTU/lb-°F
@Temperature 77.0 °F
Crystalline
 1.18 J/g-°C
@Temperature 227 °C
0.282 BTU/lb-°F
@Temperature 440 °F
Calculated
 1.31 J/g-°C
@Temperature 327 °C
0.313 BTU/lb-°F
@Temperature 620 °F
Calculated
Heat of Formation -990.4 kJ/mol-990.4 kJ/molCrystalline
 
Optical PropertiesMetricEnglishComments
Refractive Index 1.6491.649na
 1.6591.659nß
 1.665
@Wavelength 435.8 nm
1.665
@Wavelength 435.8 nm
ng
 
Descriptive Properties
Cleavage(010)
SolubilityInsoluble in H2O; Soluble in Acid and Alkaline Solutions
SynonymBoehmite

References for this datasheet.

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EINOR2023 / 4164

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