The crystal structure of the new mineral dyrnaesite-(La), Na8CeIVREE2(PO4)6

Research output: Contribution to journal › Journal article › Research › peer-review

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The crystal structure of the new mineral dyrnaesite-(La), Na8CeIVREE2(PO4)6. / Balic Zunic, Tonci.

In: Mineralogical Magazine, Vol. 81, No. 1, 2017, p. 199-208.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Balic Zunic, T 2017, 'The crystal structure of the new mineral dyrnaesite-(La), Na8CeIVREE2(PO4)6', Mineralogical Magazine, vol. 81, no. 1, pp. 199-208. https://doi.org/10.1180/minmag.2016.080.096

APA

Balic Zunic, T. (2017). The crystal structure of the new mineral dyrnaesite-(La), Na8CeIVREE2(PO4)6. Mineralogical Magazine, 81(1), 199-208. https://doi.org/10.1180/minmag.2016.080.096

Vancouver

Balic Zunic T. The crystal structure of the new mineral dyrnaesite-(La), Na8CeIVREE2(PO4)6. Mineralogical Magazine. 2017;81(1):199-208. https://doi.org/10.1180/minmag.2016.080.096

Author

Balic Zunic, Tonci. / The crystal structure of the new mineral dyrnaesite-(La), Na8CeIVREE2(PO4)6. In: Mineralogical Magazine. 2017 ; Vol. 81, No. 1. pp. 199-208.

Bibtex

@article{38a687e61ab8496ea525aef453ebe93a,
title = "The crystal structure of the new mineral dyrnaesite-(La), Na8CeIVREE2(PO4)6",
abstract = "Dyrnaesite-(La), Na7.89(Ce0.94Ca0.06)Σ1.00(La1.14Ce0.40Pr0.10Nd0.24Ca0.12)Σ2.00(PO4)6 is orthorhombic, Pnma, a = 18.4662(7), b = 16.0106(5), c = 7.0274(2) {\AA}, V = 2077.7(1) {\AA}3, Z = 4. The crystal structure is related to the group of Na3REE(XO4)2 compounds (with X = P, V, As), based on the aphthitalite/glaseritestructural type. Dyrnaesite is distinct in having ordered Na vacancies, and a rare-earth element (REE) site occupied preferentially by Ce4+. This also distinguishes it from closely related vitusite-(Ce) [Na3REE(PO4)2]. The relation of their unit cells is: ad = bv, bd = 3av, cd = 1/2cv. The distinct Ce4+ site in dyrnaesite-(La) has smaller coordination with shorter bond lengths than the other REE site in the same structure or the REE sites in vitusite-(Ce). It is adjacent to the predominately vacant Na site, which in its turn has the largest coordination of all Na sites in the structure. REE sites, or Na sites in a [010] row (similar to [100] in vitusite-(Ce)) assume two types of coordinations with and without mirror symmetry and two different configurations of surrounding PO4 tetrahedra. This summarizes the topological difference to vitusite-(Ce) where the corresponding coordinations are similar in the same row and intermediate in character to the two types in dyrnaesite-(La).",
keywords = "Faculty of Science",
author = "{Balic Zunic}, Tonci",
year = "2017",
doi = "10.1180/minmag.2016.080.096",
language = "English",
volume = "81",
pages = "199--208",
journal = "Mineralogical Magazine",
issn = "0026-461X",
publisher = "Mineralogical Society",
number = "1",

}

RIS

TY - JOUR

T1 - The crystal structure of the new mineral dyrnaesite-(La), Na8CeIVREE2(PO4)6

AU - Balic Zunic, Tonci

PY - 2017

Y1 - 2017

N2 - Dyrnaesite-(La), Na7.89(Ce0.94Ca0.06)Σ1.00(La1.14Ce0.40Pr0.10Nd0.24Ca0.12)Σ2.00(PO4)6 is orthorhombic, Pnma, a = 18.4662(7), b = 16.0106(5), c = 7.0274(2) Å, V = 2077.7(1) Å3, Z = 4. The crystal structure is related to the group of Na3REE(XO4)2 compounds (with X = P, V, As), based on the aphthitalite/glaseritestructural type. Dyrnaesite is distinct in having ordered Na vacancies, and a rare-earth element (REE) site occupied preferentially by Ce4+. This also distinguishes it from closely related vitusite-(Ce) [Na3REE(PO4)2]. The relation of their unit cells is: ad = bv, bd = 3av, cd = 1/2cv. The distinct Ce4+ site in dyrnaesite-(La) has smaller coordination with shorter bond lengths than the other REE site in the same structure or the REE sites in vitusite-(Ce). It is adjacent to the predominately vacant Na site, which in its turn has the largest coordination of all Na sites in the structure. REE sites, or Na sites in a [010] row (similar to [100] in vitusite-(Ce)) assume two types of coordinations with and without mirror symmetry and two different configurations of surrounding PO4 tetrahedra. This summarizes the topological difference to vitusite-(Ce) where the corresponding coordinations are similar in the same row and intermediate in character to the two types in dyrnaesite-(La).

AB - Dyrnaesite-(La), Na7.89(Ce0.94Ca0.06)Σ1.00(La1.14Ce0.40Pr0.10Nd0.24Ca0.12)Σ2.00(PO4)6 is orthorhombic, Pnma, a = 18.4662(7), b = 16.0106(5), c = 7.0274(2) Å, V = 2077.7(1) Å3, Z = 4. The crystal structure is related to the group of Na3REE(XO4)2 compounds (with X = P, V, As), based on the aphthitalite/glaseritestructural type. Dyrnaesite is distinct in having ordered Na vacancies, and a rare-earth element (REE) site occupied preferentially by Ce4+. This also distinguishes it from closely related vitusite-(Ce) [Na3REE(PO4)2]. The relation of their unit cells is: ad = bv, bd = 3av, cd = 1/2cv. The distinct Ce4+ site in dyrnaesite-(La) has smaller coordination with shorter bond lengths than the other REE site in the same structure or the REE sites in vitusite-(Ce). It is adjacent to the predominately vacant Na site, which in its turn has the largest coordination of all Na sites in the structure. REE sites, or Na sites in a [010] row (similar to [100] in vitusite-(Ce)) assume two types of coordinations with and without mirror symmetry and two different configurations of surrounding PO4 tetrahedra. This summarizes the topological difference to vitusite-(Ce) where the corresponding coordinations are similar in the same row and intermediate in character to the two types in dyrnaesite-(La).

KW - Faculty of Science

U2 - 10.1180/minmag.2016.080.096

DO - 10.1180/minmag.2016.080.096

M3 - Journal article

VL - 81

SP - 199

EP - 208

JO - Mineralogical Magazine

JF - Mineralogical Magazine

SN - 0026-461X

IS - 1

ER -

ID: 177060326