Structure Elucidation and Characterization of the High‐Pressure Nickel Borate Hydroxide NiB₃O₅(OH)

Abstract

The high‐pressure nickel borate hydroxide NiB3O5(OH) was synthesized in a high‐temperature/high‐pressure reaction at 4 GPa and 1023 K using a Walker‐type multianvil apparatus. Single‐crystal X‐ray diffraction was used to determine the structure of NiB3O5(OH). It crystallizes in the monoclinic space group P21/c (no. 14) with a = 4.3222(1), b = 9.5888(2), c = 8.5067(3) Å, and β = 90.50(1)°. Furthermore, the compound was characterized by powder X‐ray diffraction, vibrational spectroscopy, and magnetic measurements. The effective magnetic moment is μeff = 3.30(1) μB and the Weiss constant θP = –28.3(1) K indicates antiferromagnetic interactions in the paramagnetic regime.

Organic acids under pressure: elastic properties, negative mechanical phenomena and pressure induced phase transitions in the lactic, maleic, succinic and citric acids

“…The investigation of the behavior of solid materials under pressure is highly relevant in many scientific research fields such as geoscience, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] planetary science and astrophysics, [17][18][19][20][21][22][23][24][25][26][27][28] condensed matter physics [29][30][31][32][33][34][35][36][37][38][39][40][41] and materials science. The study of carbon, hydrocarbon, and general organic materials under pressure has played a remarkably important role in these fields and also in biochemistry, biophysics and organic chemistry and physics.…”

High‐Pressure Synthesis of the Acentric Borate DyB5O8(OH)2

“…Hence, the asymmetric and symmetric stretching modes of the [BO 4 ] 5– groups are located in the range from 1025 and 900 cm –1 . The energetic region below 900 cm –1 is usually attributed to bending and complex vibrations of both [BO 3 ] 3– and [BO 4 ] 5– groups . The characteristic bands concerning the tetrahedral [BO 4 ] 5– group can be found at 1008, 853, 716, and 492 cm –1 .…”

High-Pressure Synthesis and Characterization of the Ammonium Yttrium Borate (NH4)YB8O14

“…Apart from compounds exhibiting hitherto unknown compositions (such as Co 7 B 24 O 42 (OH) 2 •2H 2 O 6 ) or striking new structural features (e.g., the first ammine borate Cd(NH 3 ) 2 [B 3 O 5 (NH 3 )] 2 7 or the first transition metal cluster containing borate Mo 2 B 4 O 9 8 ), we observed an impressive structural diversity in some M−B−O(−H) (M = transition metal) systems. Our most recent investigations in the system Ni−B−O(−H), for example, yielded three novel high-pressure compounds, γ-NiB 4 O 7 , 9 Ni 3 B 18 O 28 (OH) 4 •H 2 O, 10 and NiB 3 O 5 (OH), 11 within a very narrow p−T range (4−5 GPa/700−900 °C). Inspired by these findings, we turned our attention to yttrium borates because no high-pressure studies have yet been published on these compounds.…”