ss_2 - -Window glass High transparency -Space shuttle tile...

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Core 3.27 (a) Pb: ( ) 2 1 , 2 1 , 2 1 O: ( 2 1 ,0,0) (0, 2 1 ,0) (0,0, 2 1 ) ( 2 1 ,1,0) (1, 2 1 ,0) (1,0, 2 1 ) (0,1, 2 1 ) (1,1, 2 1 ) ( 2 1 ,0,1) (0, 2 1 ,1) (1, 2 1 ,1) ( 2 1 ,1,1) Zr/Ti: (0,0,0) (0,0,1) (1,0,0) (0,1,0) (1,1,0) (1,0,1) (0,1,1) (1,1,1) (b) Pb: 1* 1 per uc =1 Zr/Ti: 8* 8 1 per uc = 1 O: 12 * 4 1 per uc =3 (c) 2 2 0 . o O Pb PbO 2 4 2 2 . o O Ti TiO
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1 * (+2) +1*(+4) + 3*(-2) = 2 + 4 -6 = 0 o The unit cell is electrically neutral (it must be). (d) The T: ions occupy equilibrium lattice positions at the unit cell corners. When Zr is exchanges for Ti, it is substituted for Ti and occupies a corner position.
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Core 4.1 - Brick – High compressing strength
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Unformatted text preview: -Window glass High transparency -Space shuttle tile Low thermal conductivity -Spark plug body Low electrical resistivity -Abrasives + cutting tools High hardness Core 4.3 Ga F = 1.8 As = 2.2 % = % 92 . 3 100 ) 8 . 1 2 . 2 ( 4 1 exp 1 2 I.e. this is primarily a covalent bond The slight charge associated with As and Ga . would lead to move them slightly closer together along (111) relative to Si which is purely covalent....
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ss_2 - -Window glass High transparency -Space shuttle tile...

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