Question

1. The XRD results of SrAl$_2$O$_4$ radiated with Cu K$_\alpha$ shows that; SrAl$_2$O$_4$ has two phases, namely monoclinic structure at low temperature, with space group P2$_1$, and unit cell parameters a = 8.447 \AA, b = 8.816 \AA, c = 5.163 \AA, $\beta$ = 93.42 $^\circ$C and hexagonal structure at high temperature with space group P6$_3$22, with unit cell parameters a = b = 5.140 \AA, c = 8.462 \AA. See figure below (a) (b) Monoclinic (P2$_1$) SrAl$_2$O$_4$ Hexagonal (P6$_3$22) SrAl$_2$O$_4$ 1.1 Which structure will have a bigger d spacing if the most intense peak in both structures has (031) index? 1.2 Determine the diffraction angle for both phases. (8) (6) 1.3 Suppose the reflection is a second order, which phase will have a bigger angle? (6)

          1. The XRD results of SrAl$_2$O$_4$ radiated with Cu K$_\alpha$ shows that; SrAl$_2$O$_4$ has two phases, namely monoclinic structure at low temperature, with space group P2$_1$, and unit cell parameters a = 8.447 \AA, b = 8.816 \AA, c = 5.163 \AA, $\beta$ = 93.42 $^\circ$C and hexagonal structure at high temperature with space group P6$_3$22, with unit cell parameters a = b = 5.140 \AA, c = 8.462 \AA. See figure below
(a)
(b)
Monoclinic (P2$_1$)
SrAl$_2$O$_4$
Hexagonal (P6$_3$22)
SrAl$_2$O$_4$
1.1 Which structure will have a bigger d spacing if the most intense peak in both structures has (031) index?
1.2 Determine the diffraction angle for both phases.
(8)
(6)
1.3 Suppose the reflection is a second order, which phase will have a bigger angle? (6)

$1. The XRD results of SrAl2O4 radiated with Cu Kα shows that; SrAl2O4 has two phases, namely monoclinic structure at low temperature, with space group P21, and unit cell parameters a = 8.447 Å, b = 8.816 Å, c = 5.163 Å, β = 93.42 ^∘C and hexagonal structure at high temperature with space group P6322, with unit cell parameters a = b = 5.140 Å, c = 8.462 Å. See figure below (a) (b) Monoclinic (P21) SrAl2O4 Hexagonal (P6322) SrAl2O4 1.1 Which structure will have a bigger d spacing if the most intense peak in both structures has (031) index? 1.2 Determine the diffraction angle for both phases. (8) (6) 1.3 Suppose the reflection is a second order, which phase will have a bigger angle? (6)$

Added by Fernando T.

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