Pr4B10O21: A new composition of rare-earth borates by high-pressure/high-temperature synthesis

Haberer, Almut; Heymann, Günter; Huppertz, Hubert

doi:10.1016/j.jssc.2007.02.021

Cited by 25 publications

(15 citation statements)

References 35 publications

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“…Figures 5 and 6 show the crystal structures of both compounds. Recently, it was possible to synthesize a new composition Pr 4 B 10 O 21 in rare-earth borate chemistry [36]. Figure 7 gives a view of the crystal structure of Pr 4 B 10 O 21 .…”

Section: Syntheses Of New Boratesmentioning

confidence: 99%

New Aspects of Borate Chemistry under High-Pressure

Huppertz¹

2008

MRS Proc.

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At the moment, over 1100 borate crystal structures are listed in the Inorganic Crystal Structure Database ICSD. High-pressure investigations in this field are rare and were mainly performed from a geological point of view. Starting in 1999, systematic high-pressure / hightemperature experiments up to maximum pressures of 16 GPa have been carried out, using the multianvil technique to explore the synthetic possibilities in the field of borates under extreme conditions. This approach led to a variety of interesting new materials, which are unattainable via conventional solid state syntheses. The communication will give a short survey of the most important results in the last years.

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Section: Syntheses Of New Boratesmentioning

confidence: 99%

New Aspects of Borate Chemistry under High-Pressure

Huppertz¹

2008

MRS Proc.

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“…With the high-pressure/high-temperature synthesis of La 4 B 10 O 21 , we add a new compound to the existing lanthanum-oxoborates. This compound is isotypic to Pr 4 B 10 O 21 [15]. In the following, we describe the synthesis, the single-crystal structure determination, IR spectroscopic investigations, and quantum-chemical calculations of harmonic vibrational frequencies of La 4 B 10 O 21 .…”

Section: Introductionmentioning

confidence: 99%

High-pressure Synthesis and Characterization of the Rare-earth Borate La₄B₁₀O₂₁

Hinteregger

Heymann

Hofer

et al. 2012

Zeitschrift Für Naturforschung B

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The lanthanum(III)-decaborate La 4 B 10 O 21 was synthesized under high-pressure/high-temperature conditions of 2.6 GPa and 750 • C in a Walker-type multianvil apparatus. The single-crystal structure determination revealed that La 4 B 10 O 21 is isotypic to Pr 4 B 10 O 21 . La 4 B 10 O 21 crystallizes monoclinically with four formula units in the space group P2 1 /n with the lattice parameters a = 716.7(2), b = 1971.5(4), c = 958.3(2) pm, and β = 93.7(1) • . The three-dimensional boron-oxygen framework consists of [BO 4 ] 5− tetrahedra and trigonal-planar [BO 3 ] 3− groups. The structure contains four crystallographically different lanthanum ions. Two of the ions are surrounded by 10, one by 11, and the fourth one by 12 oxygen anions. In addition to IR-spectroscopic investigations, DFT calculations were performed to support the assignment of vibrational bands.

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“…Borates have been extensively examined under high-pressure/ high-temperature conditions and a large variety of new compounds could be obtained, for example the rare-earth borates RE 4 B 6 O 15 (RE¼Dy, Ho) [1][2][3], a-RE 2 B 4 O 9 (RE¼Sm-Ho) [4][5][6], b-RE 2 B 4 O 9 (RE¼Gd [7], Dy [8]), RE 3 B 5 O 12 (RE¼Er-Lu) [9], and Pr 4 B 10 O 21 [10]. Borates, being glass formers in general, show an increased tendency to crystallize under pressure, which seems to be valid for fluorine-containing borates, too.…”

Section: Introductionmentioning

confidence: 99%