Multianvil high-pressure/high-temperature preparation, crystal structure, and properties of the new oxoborates Dy4B6O14(OH)2 and Ho4B6O14(OH)2

High‐Pressure Synthesis and Characterization of New Actinide Borates, AnB4O8 (An=Th, U)

“…However, trigonal [BO 3 ] 3À groups are expected at wavenumbers above 1150 cm À1 . [37][38][39][40] No bands are observed above 1200 cm À1 , as expected from the crystal structure due to the absence of trigonal [BO 3 ] 3À groups. Bands at smaller wavenumbers than 500 cm À1 can be assigned to An À O (An = Th, U) bonds, to lower-wavenumber-shifted bending and stretching modes of tetrahedral [BO 4 ] 5À groups, and to lattice vibrations.…”

Intermediate States on the Way to Edge‐Sharing BO4 Tetrahedra in M6B22O39⋅H2O (M=Fe, Co)

“…Assignments of the vibrational modes are based on comparison with experimental data of borate crystals and glasses containing BO 3 and BO 4 building units. [23,[52][53][54][55][56] However, due to the different structure and the interconnecting metal cations, assignments remain tentative to a certain degree. [57] The strong absorptions between 3100 and 3600 cm À1 in the IR spectra of M 6 B 22 O 39 ·H 2 O (M= Fe, Co) are typical for water-containing borates, and confirm the presence of crystal water in the structure.…”

A new structure type of RE4B4O11F2: High-pressure synthesis and crystal structure of La4B4O11F2

“…In contrast to FTIR, no bands were observed between 3000 and 4000 cm À 1 , which is probably related to the comparatively low sensitivity of Raman spectroscopy for hydroxyl vibrational modes. The Raman spectrum will be compared to the polymorph Gd 4 B 4 O 11 F 2 ; the band assignments were made in analogy to structurally and chemically similar borate compounds [5,[52][53][54][55][56].…”