the rst We peaks at the tic-ray oil-traction pattern tor tungsten. which has a
BBC crystal structure: an int-ray source with a wavelength of [1.1542 nm was
used. 1 3. Determine the lattice parameter
the rst ve peaks of the inc-ray diffraction pattern fo
The rst ve peaics of the 1-t-rs1-ir diffraction pattern for tungsten. which has a
BBC crystal structure; an x-rey source with swaveiength of [1.1542 nm was
useo.i i . 1What are the indices (hid) tor the rst three peaks?
23. 1u'tihen int-rays penetrate into a materiai anci interact with etc-me, the int-rays
are _ecattered .
24. Lattice planee have a _per1'ctt spacing, which ailcwe the crystal to
act as a diffraction grating.
The density of niobium is agfoma. It's atomic mess is 92.91 gfmol end its
structure is oco. cfw_e Gaioulate the lattice parameter and the atomic radius from
this information. (b) What is the pienar density of atoms in the cfw_t 113
21. The _denait5r of atoms within different crystal planes may. affect
material preper'iiee such as the preferred aiip cfw_deformatienj direction.
22. In the metal FCC structure. the 'eleae-packed' plane is _cfw_1IDL_.
whereas in H
Question 14 i 2 P
lQ. Lattioe _posilions_ refer to relaljve locations in the unit cell. whereas
Lattice _poinl:e_ refer to specic locations in the unit cell that are
equivalent through translational smmetry.
Question 15 2" 2 P
ED. In he
IT. The seven _cryetel_ eyeterne deeerilee the _ehep-e_et the unit cell
witheut considering the atom peeitidhe.
the lengths of the unit cell edges are referred he as the _lettiee
Gum Arum-er . ' . True