, a, b c, . , , . , . a*. : 0, 1- 1 .. , K L.
, Hhkl .
I. H ½ H ½=1/d. d - (2dsinq=l),
½ H ½= (3.32)
(a=b=c): = ê H ê2,
H2+K2+L2 = íê H ê/a*ý2 = íê H ê× a ý2 (3.33)
:
0- (K, L, 0) íê H ê×aý2 = K2+L2
1- (K, L, 1) íê H ê×aý2 = K2+L2+1 K2+L2 = íê H ê×aý2 1
2- (K, L,2) íê H ê×aý2 = K2+L2+4 K2 +L2= íê H ê×aý2 4
3- (K, L, 3) íê H ê×aý2 = K2+L2+9 K2+L2 = íê H ê×aý2 9
(3.34)
(3.34) K L, . 1, , , q.
II. q. . : 2l q
2q 0 = (3.35)
r - . b - ( ), b -
sinqa/sinqb=la/lb (3.36)
a - q0, H (3.32) , (3.34), íêH ê×aý2 , L .1. 2.
n- H n- (. 3.21). q n- Pn¢ P0 (.3.25), r.
.3.25. q n-.
cos2q=cos 2b ×cos an (3.37)
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an (3.29). b , 0-
b=57,3 (3.38)
l - P0P0¢ (.3.26) Pn. , 2 l, , b
2b=57,3 (3.39)
Ka - n- (n¹0) , Ka- , a- ( ).
q0 (3.37), H, íê H ê×aý2 . 1 L. 3.
1.
(K2 + L2) K L.
K\L | ||||||
2.
=0.
l (2 l) | q=57,3 | sinq | H= | (H×a)2 a=1/d* | .1 K L | H,K,L | |
3.
=1, 2,..
l (2 l) | 2b=57,3 cos2b | an, cosan | cos2q q | sinq | H= | (H×a)2 | 2 + L 2 | H, K, L | |