Lattice vibrations and thermal conductance of Li₂O(B₂O₃)₃ crystals

Abstract

Li 2 O·3B 2 O 3 or Li 2 O.B 2 O 3 / 3 (LOBO) crystallizes in the orthorhombic space group Pna2 1 with cell parameters a = 0.73788(6), b = 0.84473(7) and c = 0.51395(5) nm and two formula units in the primitive cell. Raman results show that the characteristic spectra of LOBO are mainly contributed by particularly the B(3) -O tetrahedra and also the B(1) -O and B(2) -O triangles and partly ascribed to the breathing vibrations of the B -O rings. The structural rigidity of LOBO is associated with all B -O bond stretching and bending of especially the B(3) -O bonds. The excellent non-linear optical properties of LOBO are mainly attributed to the more anionic groups in the primitive cell and their deviations from the T d or D 3h symmetry. The short ultraviolet absorption edge is mainly attributable to the tilt of the B -O rings. The lattice thermal vibrations show that the anisotropically thermal conductivity is outstanding especially along the c direction.

Structure and electrical conductivity of new Li2O–CeO2–B2O3 glasses

“…The role of CeO 2 as a network former at the expense of its role as a network modifier increases simultaneously with increasing the molar ratio Li 2 O/B 2 O 3 . It can be concluded that most of CeO 2 content is associated with B 2 O 3 network to convert BO 3 into BO 4 − units. The role of cerium oxide as a TMO in the conductivity behaviour was suppressed by the role of Li + ion as a small and highly conductive ion.…”

“…IR spectroscopic study of CeO 2 -B 2 O 3 glasses [6] showed that at CeO 2 less than 40 mol%, cerium oxide plays the role of network former. For higher concentrations, CeO 2 would play a dual role; most of CeO 2 plays the role of network modifier to change BO 3 into BO 4 − units and some CeO 2 plays the role of network formers (O = bridging oxygen). In all cases, introducing CeO 2 into the B 2 O 3 network would increase the crosslinking of the glass matrix due to the increasing number of CeO 4 and/ or BO 4 − groups in the glass skeleton.…”

“…Binary Li 2 O-B 2 O 3 -glasses [1,2] and -crystals [3][4][5] were studied extensively by IR spectroscopy. On the other hand little attention has been made to the binary CeO 2 -B 2 O 3 glasses [6].…”

Probing magnetoelastic coupling and structural changes in magnetoelectric gallium ferrite

“…in a primitive cell and Pna2 1 (C 2v 9 ) space group [27]. Since above space group does not contain an inversion center, the IR active modes are simultaneously Raman active and these modes are nondegenerate [28]. In the present study, we acquired Raman spectra of single crystals and observe 31 Raman active modes in the spectral range of 90-900 cm -1 at room temperature.…”

In situ Raman investigation of a LiB3O5melt toward understanding the structural memory phenomena

“…The crystal Raman spectrum (Fig. 2(a)) possesses all the spectral characteristics of a LBO crystal, 15,16 indicating that the crystal is LBO. The melt Raman spectrum (Fig.…”