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

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

Volume 54 (2023): Issue 1 (January 2023)

By: Kacper Staszel , Anna Jędras , Mateusz Skalny , Klaudia Dziewiątka , Kamil Urbański, Julia Sordyl , Karolina Rybka and Maciej Manecki

Open Access

|Dec 2023

Figures & Tables

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

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.

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.

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

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

Comparison of FTIR spectra of LREE phosphates containing Pb (left) and Pb-free control phases (LREE rhabdophanes, right) 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
	PO₄^3- [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
Phase		[Å]		α = ß = γ	[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

DOI: https://doi.org/10.2478/mipo-2023-0006 | Journal eISSN: 1899-8526 | Journal ISSN: 1899-8291

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Language: English

Page range: 58 - 68

Submitted on: May 30, 2023

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Accepted on: Nov 13, 2023

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Published on: Dec 19, 2023

Published by: Mineralogical Society of Poland

In partnership with: Paradigm Publishing Services

Publication frequency: 1 issue per year

Keywords:

REE phosphates,

lead phosphates,

‘phosphoschultenite’,

Related subjects:

Geosciences, other

© 2023 Kacper Staszel, Anna Jędras, Mateusz Skalny, Klaudia Dziewiątka, Kamil Urbański, Julia Sordyl, Karolina Rybka, Maciej Manecki, published by Mineralogical Society of Poland
This work is licensed under the Creative Commons Attribution 4.0 License.

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