Effects of boron bearing additives on high temperature properties of doloma-based carbon bonded refractories

Rôle d'additifs borurés sur les propriétés des réfractaires de Dolomie à Liaison Carbone -- Élaboration des briques de dolomie et de mag-dolomie -- The making of Doloma and Magdoloma- carbon refractories -- The making of doloma -C and Magdoloma-C specimens -- Oxidation tests -- Slag corrosion resistance tests -- Measurements of hot strength -- Oxidation resistance of Doloma-C and Magdoloma -- C refractories -- Slag corrosion resistance of Doloma-C and Magdoloma-C refractories -- Studies on HMOR of Doloma-C and Magdoloma-C refractories -- HMOR test -- Phase composition and microstructure of specimens after HMOR test -- Oxidation resistance -- Corrosion resistance -- HMOR -- Comprehensive evaluation on the high temperature properties -- Mechanism of borom additives on high temperature properties

Rheological behavior of bauxite-and alumina-based castables

Evolution of materials, manufacturing and installing technology of castables -- Rheology of refractory castables -- Alumina-based castables -- Rheology of bauxite-based SiC-containing castables -- Rheological behaviour of bauxite-based silicon carbide containing castables -- High temperature mechanical properties of bauxite-based sic-containing castables -- Rheology of ultra-low cement alumina-based castables -- Rheology of zero cement alumina-based castables

Towards superior X-ray detection performance of two-dimensional halide perovskite crystals by adjusting the anisotropic transport behavior

Two-dimensional (2D) organic–inorganic hybrid halide perovskites have recently attracted extensive attention for electronic and optoelectronic applications due to their tunable properties and superior stability compared with their three-dimensional (3D) counterparts. Here, we report two kinds of organic cation (linear butylamine (BA) and branched isobutylamine (i-BA)) tailored CsPbBr3 crystals, namely (BA)2CsPb2Br7 and (i-BA)2CsPb2Br7, grown by the temperature-cooling method. The organic cations' adjustable anisotropic structure, optoelectronic properties and X-ray detection performance have been systematically investigated. By shortening the spacer cation from BA to i-BA, the degree of anisotropy in 2D perovskite crystals is decreased, which may be ascribed to the reduced interlayer distance and barrier height resulting from the enhanced electronic coupling between neighboring organic cations. In particular, the device based on the (BA)2CsPb2Br7 crystal along the ab plane exhibits superior X-ray sensitivity up to 13.26 mC Gy−1 cm−2 at a relatively low electric field of 2.53 V mm−1, owing to the multiple quantum well structure that restricts the charge carrier transport within the ab plane resulting in efficient charge collection. Simultaneously, a superior long-term working stability is obtained under a high X-ray dose rate of 278.4 μGy s−1. We anticipate that these findings will be helpful for the development of Ruddlesden–Popper perovskites for future research and applications

Solution-Grown Formamidinium Hybrid Perovskite (FAPbBr3) Single Crystals for α‑Particle and γ‑Ray Detection at Room Temperature

Compared with the widely reported MAPbBr3 single crystals, formamidinium-based (FA-based) hybrid perovskites FAPbBr3 (FPB) with superior chemical and structure stability are expected to be more efficient and perform as more reliable radiation detectors at room temperature. Here, we employ an improved inverse temperature crystallization method to grow FPB bulk single crystals, where issues associated with the retrograde solubility behavior are resolved. A crystal growth phase diagram has been proposed, and accordingly, growth parameters are optimized to avoid the formation of NH4Pb2Br5 secondary phase. The resulting FPB crystals exhibit a high resistivity of 2.8 × 109 Ω·cm and high electron and hole mobility–lifetime products (μτ) of 8.0 × 10–4 and 1.1 × 10–3 cm2·V–1, respectively. Simultaneously, the electron and hole mobilities (μ) are evaluated to be 22.2 and 66.1 cm2·V–1·s–1, respectively, based on the time-of-flight technique. Furthermore, a Au/FPB SC/Au detector is constructed that demonstrates a resolvable gamma peak from 59.5 keV 241Am γ-rays at room temperature for the first time. An energy resolution of 40.1% is obtained at 30 V by collecting the hole signals. These results demonstrate the great potential of FAPbBr3 as a hybrid material for γ-ray spectroscopy and imaging