The optical properties and chemical decomposition of halides with layer structures. II. defects, chemical decomposition, and photographic phenomena

Bismuth tri-iodide crystal for nuclear radiation detectors

“…Fabrication of room temperature radiation detectors requires materials that have some physical properties such as high atomic number, high density and wide bandgap energy. Bismuth tri-iodide (BiI ) has also been studied for a long time [6], and attempted for use as one of the materials for radiation detectors [7]. In this paper, we report investigation of radiation detectors fabricated from BiI crystals.…”

Dependence of Optical Band Gap on Residual Stress in Group IIB Iodide (ZnI2, CdI2, HgI2) Films

“…Even the melting points (446 • C for ZnI 2, 387 • C for CdI 2 and 259 • C for HgI 2 ) of these iodides reflect this fact. Incidentally, another iodide, PbI 2, having hexagonal structure has the ionicity 0.35 [3,24] is treated as more covalent. The band gap and anisotropic dielectric constants of PbI 2 are almost comparable to those of HgI 2 [19].…”

“…For CdI 2 the value of ionicity has been given as 0.52 [3,24] showing the partial or relatively ionic character. Since E g of ZnI 2 is greater than that of CdI 2 , ZnI 2 can be treated as more ionic than CdI 2 even if we consider same ω p in equation (1).…”

“…Several layered halides are sensitive to actinic radiation [2]. Particularly sensitive compounds like CdI 2 , PbI 2 and BiI 3 have been investigated regarding their photochemical behavior [4]. The unique photochemical properties of these materials have led to applications in micro-recording, holography, printed circuits and digital information storage systems [5].…”

“…[1371]/53 halides have been reviewed extensively by Tubbs [3]. Several layered halides are sensitive to actinic radiation [2].…”