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You measure the volume, and hence the density, using a pycnometer bottle. You weigh the bottle, then fill it with the fluid of your choice (choose one that wets your powder easily) and weight it again. The different in weight divided by the density of the fluid gives you the bottle volume. Now clean, dry and reweigh your bottle. Add your powder and ...


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You need the crystal structure and unit cell dimensions to obtain the molar volume. Being polycrystalline rather than single crystal means your actual sample is probably slightly less dense than you will calculate. A quick Google search on 'unit cell LaCuO2' brought up a paper by Bob Cava in J. Mater. Res. 9(2) 314-317 (1993) with a table of the structure ...


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A mole is a specific number of objects (in this case, molecules) and therefore tells you exactly nothing about density. It does allow you to calculate the mass of a single molecule. You cannot figure out the density unless you know the crystalline structure that your molecule takes on -- if in fact it does so -- as well as the lattice spacings between ...


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A quasi-crystal has no long-range translational symmetry, but it does have long range orientational symmetry. The lattice sites all occur at well defined angles, and in well-defined planes. It is reflection from these planes that causes the well-defined spots. The fact that there is no translational symmetry within those planes does not bear on the ...



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