Recent content by KenMSE

Sorry for the late response. I was quite busy these days... Lattice is the smallest arrangement of lattice points which is periodically repeating in 3-D space. The unit cell of hR10 should be rhombohedral lattice. And the unit cell of hR10 is sometimes drawn to be hexagonal lattice(consist of...

Got it! I really appreciate your help!

I asked my instructor today. He said the first alphabet stands for crystal system, the second one stands for lattice type, and the number stands for the total number of atoms in a lattice. The crystal system of αAl2O3 is hexagonal which contains 3 rhombohedral lattices.

For 12x - 6y - 5z + 6 = 0, the three intercepts yield -1/2, 1 and 6/5. So the plane "opn" should be (-2 1 5/6). Am I doing it right? There's also a question I want to ask. If I reduced the point p to (2, 2, 3), I'd get a plane 2x - 1y - 1z + 1 = 0 which is different from 12x - 6y...

http://cst-www.nrl.navy.mil/lattice/struk/d5_1.html We take αAl2O3 (corundum) as an example. In the link I posted, it says corundum has a rhombohedral primitive unit cell. And we often use the equivalent hexagonal lattice, which contains 3 primitive cells. So I think h means hexagonal...

I found some information in Wikipedia, yet it's in German! http://de.wikipedia.org/wiki/Pearson-Symbol I think R means Rhombohedral lattice.

Is there any simplest plane parallel to "opn"? I think "opn" intercept with the horizontal X-Y plane by a particular angle. And there shouldn't be any simple plane parallel to "opn". The 3D vision is so tough to me! :cry:

I was asked the write down the Miller indices for a plane. The question is further described in http://www.wretch.cc/album/show.php?i=kenmse&b=13&f=1643363273&p=2 I took point A as an origin. For the plane "opn", the intersections with X axis and Y axis are a/2 and -a respectively. Then I...