Crystal structure of Cs3B7O12 containing a new large polyanion with 63 boron atoms

Medium-range order in cesium borate glasses probed by double-resonance NMR

“…While this scheme is consistent with some previous work on borate and borosilicate glasses [10], it postulates the formation of relatively energetically unfavourable [4] B-O- [4] B linkages at low alkali loadings, where such species are not observed in crystalline phases [11,12]. Indeed, recent 17 O NMR studies of related systems indicate some degree of ''boron avoidance'', by analogy with ''aluminium avoidance'' in zeolites, and question the validity of the Dell and Bray model [13].…”

“…133 Cs (S ¼ 7 2 ) is 100% naturally abundant, possesses a small electric quadrupole moment, and a moderate magnetogyric ratio. Although typical internuclear distances are long for this large cation (r CsO =2.9-3.6 Å , r CsB =3.4-3.7 Å ) [15][16][17], the dipolar coupling constants are large enough to permit sufficient structural sensitivity. Originally developed for measurements of internuclear distances between spin-1/2 nuclei in crystalline compounds [14], recent work has expanded the applicability of REDOR to quadrupolar nuclei in amorphous materials [18][19][20][21].…”

Oxonium Ions Substituting Cesium Ions in the Structure of the New High‐Pressure Borate HP‐Cs1−x(H3O)xB3O5 (x=0.5–0.7)

“…While the shortest CsÀO distance (277.8(2) pm) is smaller than reported for other phases in the systems Cs-B-O (minimal distances range from 291.3(7) [23] to 310.8(3) [17] pm) and Cs-B-O-H (minimal distances of 306.7(4) [25] to 311.8(3) [26] pm), the average distance of 323.1 pm lies within the range of known phases (Cs-B-O: 312 [19] -344.9 pm [33] ; Cs-B-O-H: 322.1 [26] -343.4 pm [27] ). The coordination numbers of the cesium cations in the systems Cs-B-O and Cs-B-O-H range from 6 [22] to 12 [23] and from 6 [26] to 11, [27] respectively. The cesium cations at the Wyckoff position 8f have a rather short distance to their nearest symmetry-equivalent position (307.0(1) pm).…”

“…CsB 3 O 5 consists of a three-dimensional network that is built up from triborate groups formed by two BO 3 groups and one BO 4 tetrahedron. Cs 3 B 7 O 12 , [22] which crystallizes with a voluminous cell, Cs 3 B 13 O 21 , [23] and CsBO 2 [24] complete the list of cesium borates found in the literature.…”

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]…”