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Monoclinic SmAl 3 (BO 3 ) 4 : synthesis, structural and spectroscopic properties
Author(s) -
Oreshonkov A. S.,
Shestakov N. P.,
Molokeev M. S.,
Aleksandrovsky A. S.,
Gudim I. A.,
Temerov V. L.,
Adichtchev S. V.,
Pugachev A. M.,
Nemtsev I. V.,
Pogoreltsev E. I.,
Denisenko Y. G.
Publication year - 2020
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520620008781
Subject(s) - monoclinic crystal system , crystallography , luminescence , octahedron , raman spectroscopy , crystal structure , materials science , rietveld refinement , space group , photoluminescence , chemistry , x ray crystallography , diffraction , optics , physics , optoelectronics
Single crystals of SmAl 3 (BO 3 ) 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 C 2/ c space group with unit‐cell parameters a = 7.2386 (3), b = 9.3412 (5), c = 11.1013 (4) Å and β = 103.2240 (10)°. IR and Raman spectroscopic analyses confirmed the monoclinic structure of SmAl 3 (BO 3 ) 4 . Under 532.1 nm excitation, luminescence spectra exhibit bands assignable to the transitions from 4 G 5/2 to 6 H 5/2 , 6 H 7/2 , 6 H 9/2 and 6 H 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 SmO 6 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.