Table 2.
A summary of obtained phases at different steps of acid leaching/alkali precipitation using HCl with pH=1.0) for leaching. The data has been extracted from the Rietveld refinement of the XRD patterns.
|
|
Phase |
Space group |
Lattice parameters [Å] |
wt % |
|---|---|---|---|---|
|
After first alkali precipitation at pH 4.0 (P02_01) |
ZrO2_Tetragonal |
P42/nmc |
a=3.596(1), c=5.189(1) |
40 |
|
ZrO2_Monoclinic |
P121/c1 |
a=5.150(1), b=5.200(1), c=5.316(1), β=99.106(4)° |
16 |
|
|
LaFeO3 |
Pm‐3 m |
a=3.918(1) |
25 |
|
|
La2PO4 |
P121/n1 |
a=6.847(1), b=7.080(1), c=6.517(1) β=103.323(6)° |
18 |
|
|
After first alkali precipitation at pH 6–11 (P02_02) |
La2O3 |
P‐3 m1 |
a=3.936(1), c=6.133(1) |
75 |
|
After second alkali precipitation at pH 8.0 (P02_03) |
ZrO2_Monoclinic |
P121/c1 |
a=5.144(1), b=5.191(1), c=5.316(1), β=99.215(4)° |
39 |
|
La2/3TiO3 |
Pm‐3 m |
a=3.876 |
30 |
|
|
|
ZrTiO4_Tetragonal |
P42/nmc |
a=3.586(1), c=5.205(1) |
7 |
|
Undissolved during acid leaching (after calcination) (P01_03) |
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 |