Preparation and structural properties of nonlinear optical borates K2(1−x)Rb2xAl2B2O7, 0<x<0.75

Structural field of K2Al2B2O7-family crystals

“…This proves the result from Ref. 24 where the upper limit of rubidium solubility in the K 2(1-x) Rb 2x Al 2 B 2 O 7 solution was estimated to be as high as x~0.83-0.9 under ambient conditions. Another critical point is k = ~2.8, where the transformation of P321 to P-31c takes place.…”

“…Such a compression of AlO 4 tetrahedrons is found for all the three Al positions in KABO structure. However, in K 2(1-x) Rb 2x Al 2 B 2 O 7 crystals, the continuous increase of the apex Al-O distances is observed with Rb doping, and the AlO 4 tetrahedrons become elongated in the polar crystallographic direction [24]. This mechanism provides a drastic increase of cell parameter c with the Rb-doping level increase.…”

“…The Rb 2 Al 2 B 2 O 7 (RABO), space group P2 1 /c, a = 8.901(2), b = 7. 539(1), c = 11.905(2), β = 103.97(1) º, V = 775.3(2)Ǻ 3 , Z = 4 also possesses an inversion center and isovalent substitution of Rb for K in KABO structure results in the limited range solid solution K 2(1-x) Rb 2x Al 2 B 2 O 7 [24,25]. Many other elements can be tested as substitution agents in KABO structure with a purpose to create new materials with tuned optical parameters and new functional properties.…”

Structure and Optical Properties of K0.67Rb1.33Al2B2O7 Crystal

“…As shown in Figure 1, KRABO crystallizes in the trigonal space group of P321 with cell parameters of a = b = 8.6352 (12) Series of Rb-doped K2 (1−x)Rb2xAl2B2O7 (x = 0.25, 0.5, 0.75) compounds have been studied by Atuchin et al [19]. The structures have been determined by powders to be in the same space group of P321 with KABO.…”

“…Series of Rb-doped K 2 (1−x) Rb 2x Al 2 B 2 O 7 (x = 0.25, 0.5, 0.75) compounds have been studied by Atuchin et al [19]. The structures have been determined by powders to be in the same space group of P321 with KABO.…”