Table 1.
A summary of obtained phases at different steps of acid leaching/alkali precipitation using concentrated HCl (pH<0.2) for leaching. The data has been extracted from the Rietveld refinement of the respective XRD patterns.
|
|
Phase |
Space group |
Lattice parameters [Å] |
wt % |
|---|---|---|---|---|
|
After alkali precipitation at pH 4.0 (P01_01) |
ZrO2_Tetragonal |
P42/nmc |
a=3.581(1), c=5.181(1) |
38 |
|
ZrO2_Monoclinic |
P121/c1 |
a=5.126(1), b=5.173(1), c=5.309(1), β=98.99(1)° |
26 |
|
|
LaTiO3 |
Pm‐3 m |
a=3.879(1) |
21 |
|
|
Fe2TiO5 |
Bbmm |
a=9.789(1), b=9.984(1), c=3.722(1) |
14 |
|
|
After alkali precipitation at pH 6–11 (P01_02) |
La2O3 |
P‐3 m1 |
a=3.936(1), c=6.133(1) |
75 |
|
La2Zr2O7 |
Fd‐3 m |
a=10.815(1) |
14 |
|
|
LaFeO3 |
Pm‐3 m |
a=3.843(1) |
11 |
|
|
Undissolved during acid leaching (after calcination) (P01_03) |
Zr2P2O9 |
I12/m1 |
a=10.257(1), b=6.592(1), c=10.025(1), β=95.39(1)° |
64 |
|
LiZr2(PO4)3 |
P121/n1 |
a=8.886(1), b=8.962(1), c=12.405(2), β=89.67(2)° |
12 |
|
|
ZrO2_Tetragonal |
P42/nmc |
a=3.586(1), c=5.205(1) |
7 |
|
|
ZrO2_Monoclinic |
P121/c1 |
a=5.101(2), b=5.206(3), c=5.336(3), β=98.67(3)° |
6 |
|
|
TiO2_Rutile |
P42/mnm |
a=4.602(1), c=2.971(3) |
7 |
|
|
TiO2_Anatase |
I41/amd |
a=3.790(1), c=9.544(2) |
5 |