the a,b vectors described at 1:40 cannot be "lattice translation vectors" because there exists some lattice points (center points) to which we cannot go by using integer components. ie, the center point must be at 0.5a+0.5b.. But, by the definition of "lattice translation vectors" given in episode 3, starting from an arbitrary lattice point, we should be able to go to all the other lattice points by using these vectors and INTEGER components... It is this kind of inconsitencies in texts and videos which make learning crystallography so difficult..
I do not understand the centered rectangular cell, there is no vector for the lattice point at the center so how is that center point going to get translated?
so the whole rectangle including the center point in it is considered a unit cell, and then what we translate is unit cell (whole rect box with point in it)...and if we get the basis , we are happy. So happy :) ?
+yashash chandra slower thinkers (like me!) appreciate the slow speed. That said, I can see how it might get annoying so I suggest you change the speed in the 'Settings' to 1.5 or so to make it faster for you (click on the cog symbol in the bottom right hand corner of the video).
at least he is speaking in a way that is clear and understandable, which is an exception to way most you tube videos are, but this may help you, click on the icon to the right of CC, go to speed and crank it up.
the a,b vectors described at 1:40 cannot be "lattice translation vectors" because there exists some lattice points (center points) to which we cannot go by using integer components. ie, the center point must be at 0.5a+0.5b.. But, by the definition of "lattice translation vectors" given in episode 3, starting from an arbitrary lattice point, we should be able to go to all the other lattice points by using these vectors and INTEGER components... It is this kind of inconsitencies in texts and videos which make learning crystallography so difficult..
If a primitive unit cell can only have one lattice point how come the cantered one has 2?
oh wait its not primitive is it, ok answered my own question thanks
I do not understand the centered rectangular cell, there is no vector for the lattice point at the center so how is that center point going to get translated?
so the whole rectangle including the center point in it is considered a unit cell, and then what we translate is unit cell (whole rect box with point in it)...and if we get the basis , we are happy. So happy :) ?
Am I right to say that not every parallelogram is a primitive cell? But only the one shown here is primitive.
A parallelogram that can act as a unit cell in 2D is primitive (I guess).
sir you r awesome ,and your enjoying the subject but you are too slow making it boring
+yashash chandra slower thinkers (like me!) appreciate the slow speed. That said, I can see how it might get annoying so I suggest you change the speed in the 'Settings' to 1.5 or so to make it faster for you (click on the cog symbol in the bottom right hand corner of the video).
At 2x he sounds normal xD But I really like his explanations & effort! So thanks!
at least he is speaking in a way that is clear and understandable, which is an exception to way most you tube videos are, but this may help you, click on the icon to the right of CC, go to speed and crank it up.