scholarly journals Expanding Family of Litharge-Derived Sulfate Minerals and Synthetic Compounds: Preparation and Crystal Structures of [Bi2CuO3]SO4 and [Ln2O2]SO4 (Ln = Dy and Ho)

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 887
Author(s):  
Oleg Siidra ◽  
Dmitri Charkin ◽  
Igor Plokhikh ◽  
Evgeny Nazarchuk ◽  
Astrid Holzheid ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Rare Earth ◽  
High Temperature ◽  
Solid State ◽  
Structure Type ◽  
Structural Studies ◽  
Synthetic Compounds ◽  
High Pressure High Temperature ◽  
In Cis

During the last decades, layered structures have attracted particular and increasing interest due to the multitude of outstanding properties exhibited by their representatives. Particularly common among their archetypes, with a significant number of mineral and synthetic species structural derivatives, is that of litharge. In the current paper, we report the structural studies of two later rare-earth oxysulfates, [Ln2O2]SO4 (Ln = Dy, Ho), which belong indeed to the grandreefite family, and a novel compound [Bi2CuO3]SO4, which belongs to a new structure type and demonstrates the second example of Cu2+ incorporation into litharge-type slabs. Crystals of [Bi2CuO3]SO4 were obtained under high-pressure/high-temperature (HP/HT) conditions, whereas polycrystalline samples of [Ln2O2]SO4 (Ln = Dy, Ho) compounds were prepared via an exchange solid-state reaction. The crystal structure of [Bi2CuO3]SO4 is based on alternation of continuous [Bi2CuO3]2+ layers of edge-sharing OBi2Cu2 and OBi3Cu tetrahedra and sheets of sulfate groups. Cu2+ cations are in cis position in O5Bi2Cu2 and O6Bi2Cu2 oxocentered tetrahedra in litharge slab. The crystal structure of [Ln2O2]SO4 (Ln = Dy, Ho) is completely analogous to those of grandreefite and oxysulfates of La, Sm, Eu, and Bi.

scholarly journals High-pressure Synthesis and Crystal Structure of the Borate Sc3B5O12

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1339-1344 ◽  
Author(s):  
Stephanie C. Neumair ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Rare Earth ◽  
High Temperature ◽  
Single Crystal ◽  
Structure Determination ◽  
Synthesis And Crystal Structure ◽  
High Pressure High Temperature ◽  
Rare Earth Borate ◽  
Pressure Synthesis

The rare-earth borate Sc3B5O12 was synthesized under high-pressure / high-temperature conditions of 6 GPa and 1100 °C in a Walker-type multianvil apparatus. The single-crystal structure determination revealed an isotypy to RE3B5O12 (RE = Er-Lu). Sc3B5O12 crystallizes in the rare space group Pmna (Z = 4) with the parameters a = 1245.4(3), b = 443.46(9), c = 1222.1(2) pm, V = 0.675(1) nm3, R1 = 0.0520, and wR2 = 0.0860 (all data). The structure of Sc3B5O12 is composed of layers of condensed BO4 tetrahedra, separated by eight-fold coordinated scandium ions

Crystal structure of moganite-type phosphorus oxynitride: relationship to other twinned-quartz-based structures

1999 ◽  
Vol 55 (5) ◽  
pp. 677-682 ◽  
Author(s):  
J. Haines ◽  
C. Chateau ◽  
J. M. Léger ◽  
A. Le Sauze ◽  
N. Diot ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Structure Type ◽  
Neutron Powder Diffraction ◽  
Powder Diffraction Data ◽  
Monoclinic Form ◽  
Neutron Powder Diffraction Data ◽  
Intermediate Phases ◽  
High Pressure High Temperature

The structure of moganite-type phosphorus oxynitride quenched from high-pressure high-temperature conditions has been refined using neutron powder diffraction data. This moganite-type structure, space group I2/a, Z = 12, is slightly less distorted with respect to the Imab aristotype than is moganite (a monoclinic form of silica). A close topological relationship has been identified between the moganite-type and orthorhombic BeH2 structures indicating that SiO2, PON and BeH2 all adopt structures belonging to the twinned-quartz-based group. This group represents another possible structure type for systems composed of corner-sharing AX 4 tetrahedra. Structures of this group are obvious candidates for intermediate phases between the cristobalite and quartz types.

RE4B4O11F2 (RE = Eu, Dy): New Phases Isotypic to the Fluoride Borate Gd4B4O11F2

2010 ◽  
Vol 65 (12) ◽  
pp. 1439-1444 ◽  
Author(s):  
Almut Pitscheider ◽  
Michael Enders ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Rare Earth ◽  
Structure Type ◽  
Lanthanum Fluoride ◽  
Space Group ◽  
Rare Earth Fluoride ◽  
High Pressure High Temperature ◽  
Earth Fluoride ◽  
Structure Determinations

The rare-earth fluoride borates RE4B4O11F2 (RE = Eu, Dy) were synthesized in a Walkertype multianvil apparatus from the corresponding rare-earth oxides and fluorides, and boron oxide. Eu4B4O11F2 was obtained under high-pressure/high-temperature conditions of 5 GPa and 900 °C, and Dy4B4O11F2 at 8 GPa and 1000 °C. The single-crystal structure determinations revealed that both compounds are isotypic to Gd4B4O11F2, crystallizing in the space group C2/c (Z = 4) with the parameters a = 1368.2(3), b = 465.4(1), c = 1376.6(3) pm, β = 91.2(1)°, V = 0.8765(3) nm3, R1 = 0.0232, and wR2 = 0.0539 (all data) for Eu4B4O11F2 and a = 1349.5(3), b = 460.9(1), c = 1362.5(3) pm, β = 91.3(1)°, V = 0.8472(3) nm3, R1 = 0.0353, and wR2 = 0.0729 (all data) for Dy4B4O11F2. These phases are entirely different from the recently discovered lanthanum fluoride borate La4B4O11F2, which exhibits the same constitution in another structure type with space group P21/c.

scholarly journals High-pressure synthesis and crystal structure of the mixed-cation borate Ga4In4B15O33(OH)3

2019 ◽  
Vol 74 (4) ◽  
pp. 357-363
Author(s):  
Daniela Vitzthum ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Diffraction Data ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Mixed Cation ◽  
High Pressure High Temperature ◽  
Pressure Synthesis

AbstractThe mixed cation triel borate Ga4In4B15O33(OH)3 was synthesized in a Walker-type multianvil apparatus at high-pressure/high-temperature conditions of 12.5 GPa and 1300°C. Although the product could not be reproduced in further experiments, its crystal structure could be reliably determined via single-crystal X-ray diffraction data. Ga4In4B15O33(OH)3 crystallizes in the tetragonal space group I41/a (origin choice 2) with the lattice parameters a = 11.382(2), c = 15.244(2) Å, and V = 1974.9(4) Å3. The structure of the quaternary triel borate consists of a complex network of BO4 tetrahedra, edge-sharing InO6 octahedra in dinuclear units, and very dense edge-sharing GaO6 octahedra in tetranuclear units.

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