Stability of (Cs, K)Al4Be5B11O28 (londonite) at high pressure and high temperature: a potential neutron absorber material

High‐pressure behavior and P‐induced phase transition of CaB3O4(OH)3·H2O (colemanite)

“…530.5 (7) 523.1 (7) 513.6 (7) 512.9 (7) 504.9 (6) 499.5 (7) 489.2 (5) 486.9 (6) 484.7 (6) 482.3 (8) 513.4 (5) Unique refls. (3) 24.85 (2) 24.85 (4) 24.81 (4) 24.74 (3) b ( A) 10.2064 (14) 10.1862 (13) 10.1410 (14) 10.1068 (14) 10.0822 (12) 10.0383 (14) 9.9893 (12) 9.9393 (13) c ( A) 11.726 (11) 11.663 (12) 11.692 (10) 11.664 (11) 11.579 (12) 11.578 (14) 11.595 (11) 11.547 (10) b (°) 112.45 (10) 112.64 (10) 112.44 (10) 112.81 (11) 113.18 (10) 113.24 (14) 113.33 (11) 113.50 (10) V (…”

“…2.468 (8) 25.11 (8) 1.361 (9) 1.459 (8) 1.588 (9) 1.471 (8) 1.626 (9) 417.2 (11) 135.9 (5) 0.212 P 2 4.99 (5) 2.447 (4) 24.30 (4) 1.366 (10) 1.464 (8) 1.605 (9) 1.466 (8) 1.608 (9) 413.1 (9) 135.3 (5) 0.210 P 3 6.57 (5) 2.431 (6) 24.04 (6) 1.361 (10) 1.461 (9) 1.596 (10) 1.461 (8) 1.592 (9) 404.7 (10) 135.1 (5) 0.210 P 4 6.87 (5) 2.432 (5) 24.08 (5) 1.357 (10) 1.459 (8) 1.588 (9) 1.461 (8) 1.592 (9) 403.9 (10) 135.1 (5) 0.211 P 5 8.50 (5) 2.422 (6) 23.79 (6) 1.354 (10) 1.454 (9) 1.571 (10) 1.459 (8) 1.585 (9) 397.1 (9) 135.1 (5) 0.212 P 6 9.65 (5) 2.411 (6) 23.47 (6) 1.353 (10) 1.454 (9) 1.570 (10) 1.457…”

“…Several studies have been focused on its use as an additive in concretes . or epoxy‐resins, to improve the shielding efficiency of these materials for neutron radiations, as already suggested for other B‐bearing materials . Other studies were addressed to investigate the feasibility and the effects induced by the addition of colemanite‐rich wastes in the production of lightweight concretes, heavy clay ceramics, or to improve the mechanical performances of epoxy‐resins .…”

Thermal stability and high-temperature behavior of the natural borate colemanite: An aggregate in radiation-shielding concretes

“…In this light, the scope of this study is to provide, by means of in situ differential scanning calorimetry, thermogravimetric and synchrotron X-ray diffraction analyses, a clearer picture of the behavior of colemanite at high temperature by: 1) providing a thorough characterization of the dehydration process and of its influence on the structural stability and 2) quantifying the volume thermal expansion coefficient at ambient conditions and at varying temperature. This study is part of a long-term project devoted to the characterization of the behavior of Bcontaining compounds at non-ambient conditions [40][41][42][43][44][45][46], which included: 1) the study of the high-pressure behavior of colemanite, reporting a P-induced reconstructive phase transition, characterized by the increased coordination of a fraction of B atoms from triangular to tetrahedral [45], and 2) the study of the low-T behavior of colemanite, with the transition to its ferroelectric polymorph [46].…”

Phase stability and thermo-elastic behavior of CsAlSiO4 (ABW): A potential nuclear waste disposal material

“…In this light, the aim of this study is the investigation of the phase stability and of thermo-elastic behavior of CsAlSiO 4 by in-situ high temperature (HT) and high pressure (HP) synchrotron powder diffraction. This study is part of a long-term project devoted to the synthesis and characterization of Cs-bearing crystalline compounds suitable as potential nuclear waste disposal materials [14][15][16].…”