Тип публикации: статья из журнала
Год издания: 2020
Идентификатор DOI: 10.1107/S2052520620008781
Ключевые слова: ir spectroscopy, monoclinic structure, luminescence, raman spectroscopy, x-ray diffraction, crystal structure
Аннотация: Single crystals of SmAl3(BO3)(4) were synthesized by the group growth on seeds method. The crystal structure was solved using a single-crystal experiment and the purity of the bulk material was proved by the Rietveld method. This borate crystallizes in the monoclinic C2/c space group with unit-cell parameters a = 7.2386 (3), b = 9.Показать полностью3412 (5), c = 11.1013 (4) angstrom and beta = 103.2240 (10)degrees. IR and Raman spectroscopic analyses confirmed the monoclinic structure of SmAl3(BO3)(4). Under 532.1 nm excitation, luminescence spectra exhibit bands assignable to the transitions from (4)G(5)(/2) to H-6(5/2), H-6(7/2), H-6(9/2) and H-6(11/2). The similarity of the luminescence spectra of the trigonal and monoclinic polymorphs is explained by the minor role of Sm - O bond distortion and the primary role of rotational distortion of SmO6 octahedra. The smaller covalency of the Sm-O bond in alumoborates is deduced in comparison with galloborates. Calorimetric measurements did not reveal high-temperature structural phase transitions up to a temperature of 720 K.
Журнал: ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS
Выпуск журнала: Vol. 76, Part 4
Номера страниц: 654-660
ISSN журнала: 20525206
Место издания: CHESTER
Издатель: INT UNION CRYSTALLOGRAPHY