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In HCP packing, atom planes are stacked in ABABAB form.

IN CCP (a.k.a. FCC) packing, atom planes are stacked in ABCABC form.

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Q: What is the difference between hcp and ccp closed packing?
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What is anti CCP blood test for?

When patients are positive for both CCP and http://wiki.answers.com/../rheumatoid/glance.html, it is very likely that they have http://wiki.answers.com/../../conditions/rheumatoid.htmland it is likely that they may develop a more severe form of the disease. When patients are positive for CCP but not RF and clinical signs suggest RA, then it is likely that they have early RA or that they will develop RA in the future.When patients are negative for CCP but have a positive RF, then the clinical signs and symptoms are more vital in determining whether they have RA or some other inflammatory condition. When patients are negative for both CCP and RF, then it is less likely that they have RA. It must be emphasized, however, that RA is a clinical diagnosis and may be made in the absence of positive http://wiki.answers.com/../autoantibodies/glance.html.


What is the structures of AB2 type ionic crystal?

Fluorite (CaF2 as an example) and rutile (TiO2 as an example) are the big two. Also existing are the CdI2 and CdCl2 structures (CCP and HCP respectively).


What are examples of a face centered cube?

Examples of face centered cube crystal structure (fcc or ccp) are: Copper, Silver, Gold, Nickel, Aluminum, Helium, Neon, Sulfur, Argon, Calcium, Germanium, Krypton, Strontium, Rhodium, Palladium, Xenon, Ytterbium, Platinum, Iridium, and Lead. http://periodictable.com/Properties/A/CrystalStructure.html


Why does AgBr show both Frenkel and Schottky defects?

The radius ratio for AgBr is intermediate. Thus it shows both frenkel and schottky defects. The major defect in AgBr is the Frenkel defect. It has a rocksalt structure i.e. CCP lattice of of Br with atoms of Ag occupying all octahedral holes.Ag moves from octahedral to tetrahedral sites causing only cations to precipitate. Schottky defect arise due to missing of ions from their lacttice point and frenkel arise when the mmissing ions occupy interstitial sites. in AgBr, ag+ ion is small in size and when removed from lacttice point they can occupy interstitial site and therefore show both frenkel and schottky defect. SCHOTTKY Defect in AgBr is exhibited due to precipitation of both Cations and Anions.