Re: [Jmol-users] The miller notation

[Shaul A. <sh...@tx...>]

Hello Bob,


In the  hexagonal and rhombohedral crystal systems the Bravais-Miller 
index which has 4 numbers (/h/ /k/ /i/ /l/). i=-h+k, you are correct to 
imply that it is a redundant.


i have an additional questions:


1. . how can i represent the hexagon in JMOL? The Mg unit cell (for 
example) that appears is one third of the hexagonal unit cell 
(http://en.wikipedia.org/wiki/Image:Indices_miller_bravais.png).

how can i represent the hexagon itself in JMOL?

2. Is there a convenient editor that can be used for writing long 
scripts for JMOL, interacts with JMOL and understand the JMOL syntax?


Thanks,


Shaul



Bob Hanson wrote:

> Shaul Avraham wrote:
>
>> 1. How is it possible to draw a direction [hkl] in a crystallographic 
>> unit cell by the use of the miller notation 
>> (http://en.wikipedia.org/wiki/Miller_index)?
>>
>>
> The way to do this is with Jmol math. my understanding is that hkl is 
> a plane, not a direction. So first define the plane:
>
> a = {1/2 0 0}
> b = {0 1/3 0}
> c = {0 0 1/2}
> thePlane = plane(a,b,c)
>
> Jmol 11.5.48, you easily draw lines perpendicular to this plane:
>
> draw line1 {0 0 0} perp @thePlane
>
> or
>
> draw line2 vector {0 0 0} perp @thePlane scale -2.0
>
> etc.
>
>
>> 2. in the  hexagonal 
>> <http://en.wikipedia.org/wiki/Hexagonal_crystal_system> and 
>> rhombohedral <http://en.wikipedia.org/wiki/Rhombohedral> crystal 
>> systems, it is possible to use the Bravais-Miller index which has 4 
>> numbers (/h/ /k/ /i/ /l/). It would be usefully to use this notation 
>> in this crystal structures.
>>
>>
>> -- 
>>  
>>
> show me how they work....
>
>> Shaul Avraham
>>
>> Department of materials engineering
>> Technion- Israel institute of technology
>> Haifa 32000
>> Israel
>>
>> Email: sh...@tx...
>> Phone: +972-4-829-5827
>> Fax:   +972-4-829-5677
>>  
>>
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>
>

-- 
Shaul Avraham

Department of materials engineering
Technion- Israel institute of technology
Haifa 32000
Israel

Email: sh...@tx...
Phone: +972-4-829-5827
Fax:   +972-4-829-5677