why iron,cobalt and nickel do not form typical interstitial carbides?
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Interstitial carbides form from the transition elements of groups 3a, 4a, 5a, and 6a. Group 3a carbidesare important as precipitates in metallic alloys (iron, cobalt, nickel). All of the transition metal carbidesare characterized by a wide range of stoichiometry. The most important structural material in this group is tungsten carbide, which finds wide application in wear- and erosion-resistant components, particularly drilling and cutting tools.
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Welcome dear,
● Interstitial carbides -
- Carbides of the group 4, 5 and 6 transition metals are often described as interstitial compounds.
- These carbides are usually refractory and have metallic properties.
- Usually large transition metals form interstitial compounds as the small octahedral interstices are filled by carbon atoms.
● Carbides of iron, cobalt, nickel -
- Due to small atomic size of iron, cobalt and nickel they don't form CCP with octahedral interstices.
- Therefore, instead of interstitial carbides, these metals form intermediate transition carbides.
Hope this helps you...
● Interstitial carbides -
- Carbides of the group 4, 5 and 6 transition metals are often described as interstitial compounds.
- These carbides are usually refractory and have metallic properties.
- Usually large transition metals form interstitial compounds as the small octahedral interstices are filled by carbon atoms.
● Carbides of iron, cobalt, nickel -
- Due to small atomic size of iron, cobalt and nickel they don't form CCP with octahedral interstices.
- Therefore, instead of interstitial carbides, these metals form intermediate transition carbides.
Hope this helps you...
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