Synthesis and Crystal Structure of the New High‐Pressure Phase CdB₂O₄

Abstract

The use of high-pressure/high-temperature conditions (7.5 GPa and 1100 degrees C; Walker-type multianvil apparatus) led to the synthesis of a new cadmium borate CdB2O4, starting from stoichiometric mixtures of the oxides. The crystal structure was determined on the basis of single crystal X-ray diffraction data, to reveal the hexagonal space group P6(3) with a=885.2(2), c=716.72(8) pm, Z=8, R1=0.0178, and wR2=0.0388 (all data). CdB2O4 is built up from interconnected layers of BO4-tetrahedra and exhibits for the first time the basic structure of a family of compounds, represented by BaGa2O4, KAlSiO4, KGeAlO4, KCoPO4, CaP2N4 and the recently discovered SrP2N4. The lack of superstructure ordering in CdB2O4 was confirmed by electron diffraction. Additionally, a B--O--B angle of 180 degrees was found in this borate for the first time.

Synthesis and Characterization of the Manganese Borate α-MnB2O4

“…It shows the same topology as the orthorhombic compound BaFe 2 O 4 [30], which exhibits a different connectivity of the layers, leading to a different crystal structure. Additionally, α-MnB 2 O 4 is closely related to the high-pressure compound CdB 2 O 4 [31]. The cadmium borate also consists of condensed layers of "sechser" rings of corner-sharing BO 4 tetrahedra, but with a different topology.…”

Cadmium-rare earth oxyborates Cd4ReO(BO3)3 (Re = Y, Gd, Lu): congruently melting compounds with large SHG responses

“…Such red-shift of UV absorption edges was also reported in other cadmium borates. 28,[34][35][36][37] Optical property calculations The local structure contributions of Cd 4 ReO(BO 3 ) 3 (Re ¼ Y, Gd, Lu) to the overall SHG efficiency have been estimated by the cutoff-energy-dependent SHG coefficient 32,66 according to the length-gauge formalism. 57,58 As clearly shown in Fig.…”

“…[25][26][27][28]32,33 In this work, in order to further enhance the second harmonic generation (SHG), we employed the d 10 Cd 2+ cation with polar displacement in borates to search for new NLO materials. Despite the fact that a few cadmium borates as NLO materials, such as LiCdBO 3 , 34 CdB 2 O 4 , 35 Cd 3 Zn 3 (BO 3 ) 4 , 36 CdZn 2 (BO 3 ) 2 , 37 and Cd 4 BiO(BO 3 ) 3 , 28 have been reported, little is known of cadmium-rare earth (Re) oxyborates. Excellent physical properties have been reported in NLO materials containing rare earth elements, such as YAl 3 (BO 3 ) 4 (YAB), [38][39][40] (YLSB) 42 and GdCa 4 (BO 3 ) 3 (GCOB).…”

CdB10O14(OH)4·H2O with an unprecedented decaborate fundamental building block

“…CdB 4 O 7 , Cd 3 B 2 O 6 and Cd 2 B 2 O 5 , are obtained by traditional solid-state reactions [20][21][22]. The use of high-pressure/high-temperature conditions (7.5 GPa and 1100 8C) led to the synthesis of CdB 2 O 4 [23]. By using the hydrothermal method, only two hydrous cadmium borates have been obtained, including Cd 4 (BO 3 ) 2 (OH) 2 and a hydroxyl boracite Cd 3 B 7 O 13 (OH) [24,25].…”