High‐Pressure Synthesis and Single‐Crystal Structure Elucidation of the Indium Oxide‐Borate In₄O₂B₂O₇

Abstract

The indium oxide-borate In 4 O 2 B 2 O 7 was synthesized under high-pressure/high-temperature conditions at 12.5 GPa/1420 K using a Walker-type multianvil apparatus. Single-crystal X-ray structure elucidation showed edge-sharing OIn 4 tetrahedra and B 2 O 7 units building * Univ.-Prof. Dr. H. Huppertz 2103 up the oxide-borate. It crystallizes with Z = 8 in the monoclinic space group P2 1 /n (no. 14) with a = 1016.54(3), b = 964.55(3), c = 1382.66(4) pm, and β = 109.7(1)°. The compound was also characterized by powder X-ray diffraction and vibrational spectroscopy.

Synthesis and Crystal Structure of the Acentric Indium Borate InB6O9(OH)3

“…Because of experimental limitations, a characterization below 600 cm –1 was not possible. At the lowest wavenumbers up to ∼800 cm –1 , bending and stretching vibrations of InO 6 octahedra occur. , As is generally known, BO 4 vibrations lead to bands in the region of 800–1150 cm –1 . − However, our experimental IR spectrum also shows additional absorptions between 1300 and 1500 cm –1 , which typically originate from BO 3 group vibrations. As there are no BO 3 groups in InB 6 O 9 (OH) 3 , there must be another explanation for these bands.…”

“…At the lowest wavenumbers up to ∼800 cm −1 , bending and stretching vibrations of InO 6 octahedra occur. 15,37 As is generally known, BO 4 vibrations lead to bands in the region of 800−1150 cm −1 . 38−40 However, our experimental IR spectrum also shows additional absorptions between 1300 and 1500 cm −1 , which typically originate from BO 3 group vibrations.…”

A new melilite-type rare-earth borate CdTbGaB2O7 and multicolor tunable emission in the CdTb1−xSmxGaB2O7 (0 ≤ x ≤ 0.2) phosphors

“…Similar GaO 4 and BO 4 groups have already been identied in K 2 Ga 2 O(BO 3 ) 2 and In 4 O 2 B 2 O 7 , respectively. 28,29 Furthermore, the calculated bond valence sums are 3.10 for Ga 3+ and 2.92 for B 3+ , respectively, close to their expected values, indicating the validity of the structure. 30 In the literature, several compounds with the chemical formula containing "B 2 O 7 " are known, which have various structure types from extended 2D layers to 3D frameworks.…”

“…It is the differences in the fundamental building blocks and their connection modes that make these structures significantly different, which enriches the structural chemistry of borates. based on literature data, 29,[37][38][39] and the frequencies of the B 2 O 7 group are assigned according to the characteristic vibrations of the B O B bridge and the terminal BO 3 groups. The bands due to the antisymmetric BO 3 terminal stretching vibrations of the B 2 O 7 group [n as (BO 3 )] and the antisymmetric B O B bridge stretching modes [n as (B O B)] are observed in the high-frequency region of 1250-900 cm −1 .…”

Crystal Structure of c‐M5B12O25(OH) (M=Al, Al/Ga, Ga/In) – Three Disordered Cubic Trielborates Synthesized under High‐Pressure Conditions

“…In recent years, we paid special attention to the field of triel borates, which led to 13 new high‐pressure phases since 2015. We reported for instance on In 19 B 34 O 74 (OH) 11 [1] incorporating T2 supertetrahedra, In 4 O 2 B 2 O 7 [2] being the first ternary indiumoxideborate, (NH 4 )InB 8 O 14 [3] combining all three basic borate units in one structure, Ga 2 B 3 O 7 (OH) [4] as potential material for photocatalysis, or the structure family M 5 B 12 O 25 (OH), [5] which could be synthesized with M =Al, Ga, In, and in a mixed‐cation (Ga/In) version. Our title compounds c ‐Al 5 B 12 O 25 (OH), c ‐Al 1.7 Ga 3.3 B 12 O 25 (OH), and c ‐Ga 4 InB 12 O 25 (OH) share the sum formula with the tetragonal structure family M 5 B 12 O 25 (OH) ( M =Al, Ga, In, Ga/In) but constitute cubic modifications and are therefore labelled with the letter c in front.…”