Apr 19 2013
Topics Covered
Description
Applications
Chemical Properties
Thermal, Mechanical and Optical Properties
Safety Information
Description
Silver sulfide is a dense black solid that is insoluble in all solvents, but is degraded by strong acids. It features a covalent bond, as it is made up of silver and sulfur. When silver sulfide is formed on electrical contacts operating at atmosphere rich in hydrogen sulfide, it results to the formation of long filaments known as silver whiskers. It is found in nature as relatively low temperature mineral acanthite.
Applications
Silver sulfide finds applications in the following:
-
Photosensitizer in photography
-
Anti-bacterial and anti-microbial agents
-
Laboratory reagents.
Chemical Properties
The chemical properties of silver sulfide are provided in the table below:
|
Chemical Properties |
|
Chemical Formula |
Ag2S |
|
Molecular Weight |
247.8 |
|
CAS No. |
21548-73-2 |
|
Group |
Silver – 11
Sulfur - 16 |
|
Crystal Structure |
Orthogonal |
|
Lattice Constant |
a = 4.228 Å
b = 6.928 Å
c = 7.862 Å |
Electrical Properties
The electrical properties of silver sulfide are provided in the table below:
|
Electrical Properties |
|
Dielectric Constant |
6 |
|
Band Gap |
1.08 eV |
Thermal, Mechanical and Optical Properties
The thermal, mechanical and optical properties of silver sulfide are provided in the tables below:
|
Thermal Properties |
|
Heat of Fusion |
56.9 J/g |
|
Heat of Formation |
-32.6 kJ/mol |
|
Mechanical Properties |
|
Density |
7.23 g/cm3 |
|
Melting Point |
825°C |
|
Mohs Hardness |
2.3 |
|
Optical Properties |
|
Refractive Index |
2.2 |
Safety Information
|
Safety Information |
|
Risk Phrases |
R36 - Irritating to eyes
R37 - Irritating to respiratory system
R38 - Irritating to skin. |
|
Safety Phrases |
S 24 - Avoid contact with skin
S 26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
S 36 - Wear suitable protective clothing. |