Synthesis, crystal structure and thermal behavior of Rb3B7O12, a new compound

In situ high‐temperature X‐ray diffraction study of the Rb2O‐B2O3 glass forming system

“…Annealing room-temperature X-ray powder diffraction study X-ray powder diffraction patterns of the samples with 26, 28.7, 29, 30.5 and 32 mol. % Rb 2 O prepared by solid state reaction at 600°C contained diffraction maxima corresponding to Rb 2 B 4 O 7 and low-temperature α-RbB 3 O 5 discovered in [3,8] [6] in contrast to [4] where the congruent melting of the compound is noted. The stable low-temperature α-RbB 3 O 5 transforms to a high-temperature form under heating at about 680°C [8].…”

“…Until recent investigations [3,4] Rb 2 O-B 2 O 3 system has been studied weakly in contrast to other alkali borate systems. Up to our publications [5][6][7][8][9][10][11] no any crystal structure of anhydrous Rb-borates was known. The phase relations in the system were studied using mainly DTA method and a glass crystallization method for sample preparation was used [4,[12][13][14][15][16].…”

“…The phase relations in the system were studied using mainly DTA method and a glass crystallization method for sample preparation was used [4,[12][13][14][15][16]. The following compounds was noted in the system: α-RbBO 2 [4,[12][13][14], β-RbBO 2 [4,[12][13][14][15], Rb 2 B 4 O 7 [4,[12][13][14][15], Rb 4 B 10 O 17 [6,8], α-, β-RbB 3 O 5 [3,4], RbB 3 O 5 [12][13][14][15], Rb 2 B 8 O 13 [4,[12][13][14][15], α- [4,[12][13][14], β- [4,[12][13][14][15] [12,13] . The phase diagram was reported in [12] by DTA method and in [4] using DTA and the oscillation method of phase analysis.…”

“…=80°, n g =1.562(2), n m =1.550(2) and n p =1.542 (2). [6] have been synthesized using solid-state reactions and glass crystallization methods. It is triclinic, space group P-1, a=6.603(1), b=6.632(1), c=30.085(6) Å, α=91.183(4), β=91.781(4), γ = 119.293(3)°, V=1147.4 Å 3 , Z=4.…”

New examples of crystallized and amorphous borates where the ratio of BO3 triangles to BO4 tetrahedra can be calculated from the chemical formula

“…Codes in the column for references refer to the Inorganic Crystal Structure Database[28]. (See also Ref [4][5][6][7][8][9][10][11][12][13][14][15][16][17][25][26][27][29][30][31][32][33][34]…”