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asdf1
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what does the R in hR10 mean for the pearson symbol?
asdf1 said:what does the R in hR10 mean for the pearson symbol?
asdf1 said:but doesn't the h means hexagonal system? hexagonal system only has a simple lattice...
asdf1 said:But on pg. 44 in the book, "Elements of x-ray diffraction" by B.D. Cullity and S.R. Stock, the table shows that the hexagonal system can only have the simple bravais lattice type!
The "R" in hR10 for Pearson Symbol stands for the radius ratio. This is a measure of the relative sizes of the cations and anions in a crystal structure.
The radius ratio (R) is calculated by dividing the radius of the cation by the radius of the anion. This ratio is then compared to a set of pre-defined ranges to determine the Pearson Symbol for the crystal structure.
The radius ratio is significant because it helps to predict the type of crystal structure that a compound will form. Different ranges of R correspond to different types of crystal structures, such as ionic, covalent, or metallic.
The radius ratio can affect the properties of a crystal structure in several ways. For example, a smaller radius ratio often results in a more compact and dense structure, while a larger radius ratio may lead to a more open and less dense structure. The radius ratio can also influence the strength and stability of the crystal lattice.
While hR10 for Pearson Symbol is a useful tool in predicting crystal structures, it has some limitations. It does not take into account factors such as covalent bonding or molecular packing, which can also play a role in determining the crystal structure. Additionally, the radius ratio alone may not be enough to accurately predict the structure, and other factors such as electronegativity and coordination numbers may need to be considered as well.