Abstract
Abstract The rare earth oxoborates REB5O8(OH)2 (RE = Ho, Er, Tm) were synthesized in a Walker-type multianvil apparatus at a pressure of 2.5 GPa and a temperature of 673 K. Single-crystal X-ray diffraction data provided the basis for the structure solution and refinement. The compounds crystallize in the monoclinic space group C2 (no. 5) and are composed of a layer-like structure containing dreier and sechser rings of corner sharing [BO4]5− tetrahedra. The rare earth metal cations are coordinated between two adjacent sechser rings. Further characterization was performed utilizing IR spectroscopy.
Highlights
The invention of Bridgman’s anvil apparatus [1] marked the first step to the introduction of the “belt” by Hall [2] and to high-pressure chemistry
Considering the options of different high-pressure techniques to be used in solid state chemistry, an excellent compromise can be found in a multianvil module developed by Walker et al [4, 5]
The three isotypic compounds HoB5O8(OH)2, ErB5O8(OH)2, and TmB5O8(OH)2 were synthesized via high-pressure/ high-temperature syntheses, expanding the family REB5O8(OH)2 (RE = Dy–to 451.3(1) pm (Tm))
Summary
The invention of Bridgman’s anvil apparatus [1] marked the first step to the introduction of the “belt” by Hall [2] and to high-pressure chemistry. The discovery of Dy4B6O15 [8] in 2002 revealed new structural variations with the first occurrence of edge-sharing tetrahedra in borate chemistry. This previously unknown structural motif has since been encountered several times in high-pressure borate chemistry [9, 10]. Our group currently further expands the chemistry of the rare earth (RE) borates as recently examplified by La3B6O13(OH) [19], the first acentric borate in the group of compounds exhibiting edge-sharing [BO4]5− tetrahedra. We report their characterization via singlecrystal and powder X-ray diffraction, and by infrared spectroscopy
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