- . . I.

534.2:539
- .
. I.
.. , ..
() E-mail: sobolevaeno@mail.ru
. , LiF (110,110), (111) 260 , 800 , 1065 .
:
, , .
Key words:
Poisson's ratio, crystal, elastic properties.
- [1] <(> () . - ( - , 1, , I) 1 (. 1). . 1 .
1

. 1. 1[2]
, (<<1). .
- , .. 200 [4-6]. .
(100), (110) (111)
>'> _ c+V V'l _ + 3&, /' _ 2Bcs c11c44 _ 3B - 2c44
<1100> _ 3Bcs + cnc44 <11111> _ 6B + 2c44
B _ "3 (c11 + 2c12)> cs _ "2(c11 c12)-
1. (300 ) [3]
LiF LiCl LiBr LiI
1. , 103 /3 2,601 2,075 3,470 4,061
2. , 4,0297 5,1398 5,501 6,012
3. , 11 | 2 44 106,77 39,38 63,33 49,40 22,60 24,90 39,40 18,70 17,30 28.50 14,00 13.50
4. , 1122 883 823 742
5. , 701 398 244 166
6. , / 1010 841 798 742
7. , /(.) 41,8 48,0 49,8 51,0
8. =|2/44 0,622 0,908 1,081 1,037
9. =244/(11-|2) 1,880 1,858 1,672 1,862
( ) ( ) :
3 - 2 =----------.
2(3 + )
- -- [7] , . 8 [8] .. [9] ^:
G = GPX + GPer + G
G + G 1
G = G + Gp g = ( -c + 3c )
GPX 2 , G 5 (C11 C12 + 3C44),
Gp =
Gp. =
5C44 (C11 C12)
[4c44 + 3(cl1 - C12)]
4 C44 (C11 C12 )
1
/5
11, 12 44 10 %.
2. (3QQ )
G +-(9 + 4Cs )G -
(100) a(110,001) a(110,110) a(lll) a Y
LiF Q,27Q Q,3S3 -Q,Q39 ,118 Q,185 1,271
LiCI Q,314 Q,45Q Q,Q15 ,187 Q,244 1,349
LiBr Q,322 Q,43S Q,Q77 Q,224 Q,267 1,544
Lil Q,329 Q,476 Q,Q31 Q,211 Q,264 1,617
--[(B + 4C)C44G + 2BCsC44 ] = 0-
- [7]. 11 44 ( ). 12 , . 12 .
- (. 2) :
1. LiF'>LiCl>LiBr>LiI (. . ).
2. (1101001)>^{100)>()>(110,110).
(LiF, 0<,)=-0,039, ).
. 2. /1/1 :1 (; 2) (,001); 3) (,)/ 4) (>/ 5) ()
13S
[2]:
- . . 2, .
. 2. . 2, , - , . - (110-0), (111), - 260, 800 1065 . , : ( / / ).
(. 2, -) 300 , >300 (11010) 1 .
- B/G . . 3. - (/61,75), .
. 3. : 1) ; 2) !; 3) ; 4) !

1. : , , 1, . , - :
(110,001)>(100)>()>(,).
2. , (110, 110), (111) 260, 800, 1065 . , ( ).
3. , - ( 1,75), .

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7. .., .., .. . . - : , 1982. - 286 .
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9. .. - // . - 1967. - . 176. - 2. - . 295-297.
16.07.2011 .