Dehydration Process of TlB5O6(OH)4·2H2O and Crystal Structure of TlB5O8

Crystal Structure and Thermal Behavior of Cs2[B4O5(OH)4]3H2O

“…Figure 3 O. As for previous studies on the dehydration process of other borates (33,34), this failure can be explained considering the change in the cesium ion coordination during the dehydration. After the first loss, the coordination of Cs(2) changes from six to five but that of Cs(1) changes from seven to three, which is a very unstable situation which leads to the structure collapsing.…”

New X-ray powder diffraction data for thallium pentaboratesTl[B5O6(OH)4]·2H2OandTlB5O8

“…Its structure has been solved by Woller and Heller (1981). The anhydrous thallium pentaborate T1B 5 O 8 can be obtained (Smith and Snyder, 1979) (Touboul and Nowogrocki, 1998). The experimental conditions of powder patterns collection are given in Table I.…”

“…The quality of the powder diffraction pattern of both T1[B 5 O 6 (OH) 4 ]-2H 2 O and T1B 5 O 8 was not high as indicated by the Smith and Snyder (1979) figures of merit reported in PDF 38-1131, F 30 = 10 (0.040, 74) for T1[B 5 O 6 (OH) 4 ]-2H 2 O, and in PDF 27-1452, F 30 = 11 (0.039, 68) for T1B 5 O 8 . This low accuracy is the reason why we have undertaken measurements to obtain better X-ray powder diffraction data after a recent study of the dehydration process of T1[B 5 O 6 (OH) 4 ]-2H 2 O and of the T1B 5 O 8 crystal structure (Touboul and Nowogrocki, 1998).…”

Crystal Structure and Thermal Behavior of Rb2[B4O5(OH)4]·3.6H2O

“…As shown in other borates (1,3,4), there is no analogy between the borate polyanions existing in the hydrated . In this last compound, the structure is very complex; it consists of a three-dimensional skeleton formed by three kinds of anions, BO triangles ( ), B O rings consisting of a triangle and two tetrahedra ( #2T ), and B O double rings formed by two triangles and two tetrahedra (2 #2T ).…”