Uneingeschränkter Zugang

New synthetic [LREE (LREE = La, Ce, Pr, Sm), Pb]-phosphate phases

Kacper Staszel
Kacper Staszel
, 
Anna Jędras
Anna Jędras
, 
Mateusz Skalny
Mateusz Skalny
, 
Klaudia Dziewiątka
Klaudia Dziewiątka
, 
Kamil Urbański
Kamil Urbański
, 
Julia Sordyl
Julia Sordyl
, 
Karolina Rybka
Karolina Rybka
 und 
Maciej Manecki
Maciej Manecki
   | 19. Dez. 2023
Mineralogia's Cover Image
Über diesen Artikel
Vorheriger Artikel
Nächster Artikel
Zitieren
Article Category: Original Paper
Online veröffentlicht: 19. Dez. 2023
Seitenbereich: 58 - 68
Eingereicht: 30. Mai 2023
Akzeptiert: 13. Nov. 2023
DOI: https://doi.org/10.2478/mipo-2023-0006
Schlüsselwörter
© 2023 Kacper Staszel et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1.

Comparison of PXRD patterns for products of the syntheses: a) LaPb-P and control samples (La-P and Pb-P); b) CePb-P and control samples (Ce-P and Pb-P); c) PrPb-P and control samples (Pr-P and Pb-P); d) SmPb-P and control samples (Sm-P and Pb-P). Samples with La or Sm were synthesized at pH=2 while samples containing Ce or Pr were synthesized at pH=3.
Comparison of PXRD patterns for products of the syntheses: a) LaPb-P and control samples (La-P and Pb-P); b) CePb-P and control samples (Ce-P and Pb-P); c) PrPb-P and control samples (Pr-P and Pb-P); d) SmPb-P and control samples (Sm-P and Pb-P). Samples with La or Sm were synthesized at pH=2 while samples containing Ce or Pr were synthesized at pH=3.

Figure 2.

Comparison of PXRD patterns of (LREE)PO4·0.66H2O (LREE = La, Ce, Pr, Sm) synthesized at pH=3. Miller indices above peaks indicate structure identical with monoclinic rhabdophane. Slight shift of peak position results from decreasing ionic radius of lanthanides.
Comparison of PXRD patterns of (LREE)PO4·0.66H2O (LREE = La, Ce, Pr, Sm) synthesized at pH=3. Miller indices above peaks indicate structure identical with monoclinic rhabdophane. Slight shift of peak position results from decreasing ionic radius of lanthanides.

Figure 3.

Comparison of PXRD patterns of (LREE,Pb)-phosphates synthesized at pH=3 indicating identical structure and shift resulting from decreasing ionic radius of lanthanides.
Comparison of PXRD patterns of (LREE,Pb)-phosphates synthesized at pH=3 indicating identical structure and shift resulting from decreasing ionic radius of lanthanides.

Figure 4.

Superimposed diffraction patterns of selected synthesis products showing the differences or similarities of the structures of the resulting products and systematic shifts due to the different ionic radius of La and Sm.
Superimposed diffraction patterns of selected synthesis products showing the differences or similarities of the structures of the resulting products and systematic shifts due to the different ionic radius of La and Sm.

Figure 5.

Comparison of diffraction patterns of La and Sm products synthesized at various pH, in the absence (a and b) or in the presence of Pb (c and d). Peak broadening with increasing pH is apparent in all cases.
Comparison of diffraction patterns of La and Sm products synthesized at various pH, in the absence (a and b) or in the presence of Pb (c and d). Peak broadening with increasing pH is apparent in all cases.

Figure 6.

SEM (BSE) images of LREE-phosphates (rhabdophanes) synthesized at pH=2 or 3 in the absence of Pb.
SEM (BSE) images of LREE-phosphates (rhabdophanes) synthesized at pH=2 or 3 in the absence of Pb.

Figure 7.

SEM (BSE) images of (LREE,Pb)-phosphates synthesized at pH=2 or 3 in the presence of Pb.
SEM (BSE) images of (LREE,Pb)-phosphates synthesized at pH=2 or 3 in the presence of Pb.

Figure 8.

Comparison of FTIR spectra of LREE phosphates containing Pb (left) and Pb-free control phases (LREE rhabdophanes, right) precipitated at various pH.
Comparison of FTIR spectra of LREE phosphates containing Pb (left) and Pb-free control phases (LREE rhabdophanes, right) precipitated at various pH.

Figure 9.

Comparison of TG, DTA and QMS m/z = 18 plots for Pb-rich (left) and Pb-free (right) LREE phosphates precipitated at various pH.
Comparison of TG, DTA and QMS m/z = 18 plots for Pb-rich (left) and Pb-free (right) LREE phosphates precipitated at various pH.

Composition of the solutions used for the syntheses.

Phase Solution 1 Solution 2
PO43- [mol/L] Sm3+ [mol/L] La3+ [mol/L] Ce3+ [mol/L] Pr3+ [mol/L] Pb2+ [mol/L]
La-P 0.045 – 0.045 – – –
LaPb-P 0.045 – 0.045 – – 0.045
Sm-P 0.044 0.044 – – – –
SmPb-P 0.044 0.044 – – – 0.044
Ce-P 0.320 – – 0.320 – –
CePb-P 0.320 – – 0.320 – 0.320
Pr-P 0.320 – – – 0.320 –
PrPb-P 0.320 – – – 0.320 0.320
Pb-P 0.044 – – – – 0.044

Calculated unit cell parameters of (LREE,Pb)-phosphates in orthorhombic system.

Phase a b c α = ß = γ V
[Å] [Å3]
LaPb-P 4.62 5.76 7.01 186.36
CePb-P 4.60 5.72 6.98 90° 183.66
PrPb-P 4.56 4.68 6.94 179.80
SmPb-P 4.52 5.65 6.89 175.97
eISSN:
1899-8526
Sprache:
Englisch
Zeitrahmen der Veröffentlichung:
Volume Open
Fachgebiete der Zeitschrift:
Geowissenschaften, Geophysik, andere
Zeitschrift RSS Feed