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Partial answer, from some online forum: the Si is cut on the 5-1-1 plane (not a layer but an orientation). How this orientation leads to zero (or minimal) diffraction is a nasty problem in solid geometry, I fear. For example, here's a paper which discusses a variety of diffraction situations in gory detail.


These are actually two questions in one. On one hand, certain materials are miscible like for $$ Si_{1-x}Ge{x} $$ or likewise for $$ In_xGa_{1-x}As $$. Depending on the phase diagram, some materials can be mixed, while some are not soluble and would segregate, like Steve B mentioned before. Some materials can be mixed despite a miscibility gap, if the growth ...


In the chemistry of liquids and solids, some combinations are "miscible", meaning they mix in any ratio (like water + alcohol or silicon + germanium). Other combinations are not (like water + oil or phosphorus + silicon), in which case there is a certain "solubility", and if you try to put in more than the "solubility limit" it prefers to segregate into ...


ice is a crystal pure made up of water after frozen on a certain temperature,as it is lighter than water hence its density is less than water............this can be taken as in simple words


It's because there are alternating layers of + and - ions in the c-direction, yielding a dipole in the crystal. See Tasker -- http://www.surface.tulane.edu/teaching/classnotessurface/TaskerJPhysC79.pdf


The ambiguity is resolved by choosing the coordinates first. So: 1)Set up a cartesian system with x,y,z coordinates. 2)Pick the group you would like to study. Let's say $P4_32_12$ from page 1151 of this document: http://mcl1.ncifcrf.gov/dauter_pubs/284.pdf that DavePhD recommended. 3)You can then see that the asymmetric unit is given by $$0\leq ...


Yes, the direction matters. Take a look at this electronic band structure diagram for gold. Atomic and electronic structure of gold clusters: understanding flakes, cages and superatoms from simple concepts If there was only one spatial dimension (like a wire), the diagram would just have energy vs momentum. In higher dimensions, instead the momentum ...


Falling into a smallish Black Hole will result in enormous tidal forces trying to pull the diamond apart as it approaches the event horizon. Its tensile strength we can guess at around 100GPa. So if we assume a cross section of 1 sq cm as soon as the tidal forces approach 10 MN the diamond will be ripped apart. That's like hanging a 1000 tonne weight from ...

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