Question

Homework 3:(Crystal Structure)- Due Thursday 1. Draw the following planes and directions in a tetragonal unit cell : (001), (011, 13), 110, 1201], [-101] Show cell axes. 2. Find the diffraction direction for Orthorhom bie and Hexagonal crystal lattice 3. Determine, and list in order of increasing angle, the values of 20 and corresponding (hkl for the first three lines (those of lowest 20 values) on the powder patterns of substances with the following structures, the incident radiation being Cu Ka: a) simple cubic (a 3.00 A), b) simple tetragonal (a-2.00 A, c 3.00 A), c) simple tetragonal (a-3.00 A, c-2.00 A), d) simple rhombohedral (a - 3.00 A, a 800).

Answer 1

Tdr the bo coia rechon o drauo ó Given plane s (oo) r a tetragonal untt celu: ere eplan paraltel to X and inter Cef% or) Z axis at c , a gkaded ure 乙一个c. oL 2

ve plane s CoI, dlvectior 0 So -Re plane is panal1eJ t aus e pecivel ure r's 8hONn bel。 the iven plane is 13)divection

for Risp plane , X inter Ceptsa a d y frler cep匕 b ) and z inter Capts 3 Sose Can drauo tire d3 CA the ien plare i Io ion, for tis plane, t, nter Cept X a

oe Con dhas tReure as shon belo ar I,10 the qiven plane is Co eco inter in ter Cepts 2 inter Cop ure s own bel。

e-S x inter Cepts1a inker apts = o os X Inter Cept is neg The direction remains-He,S ative.