Improved growth of PbI2 single crystals

PbI2 Single Crystal Growth and Its Optical Property Study

“…The XRD result is shown in Figure 2; the diffraction peaks observed at angles (2θ) 12.70, 25.41, 38.67, and 52.35 degrees correspond to planes (001), (002), (003), and (004) from left to right, respectively. Because all of the peaks are derived from the same planes of symmetry (001), which are perpendicular to the c-axis, this result confirms the single crystalline nature of our PbI 2 crystal [18]. Based on the Bragg equation λ = 2dsinθ and using the λ of Cu Kα (λ = 1.5406 Å), the value of the (001) peak d means the lattice constant of c-axis can be calculated to be 6.964 Å.…”

Growth of PbI2 single crystal by the top seed vertical zone melting method

“…The resistivity of the PbI 2 single crystal was 2×10 12 ·cm according to calculating formula. According to the test result of the resistivity and the research results of the literature [6], the stoichiometry of the PbI 2 single crystal which was grown in this paper was near its theoretical value. The crystal transmittance was tested by IR-prestige Fourier Transform Infrared Spectroscopy, and the result was showed in figure 6.…”

“…Although there were many research reports about the PbI 2 single crystal grown by the melt method, most of them did not realize that PbI 2 is a syntectic compound and the quality of the grown PbI 2 crystal was not high. For example, the resistivity of PbI 2 single crystal grown by the vertical Bridgman method was of 10 10 Ω cm magnitude; the single crystal grown by the horizontal zone melt method under conditions of adding in 1.5 atm of argon gas had a resistivity of 10 12 Ω cm magnitude and there was no application report in the literature , and PbI 2 single crystals grown by the U‐shaped ampoule pulling method also reached a resistivity of 10 12 Ω cm magnitude and was not suitable for promoting application because of requiring high‐purity lead and iodide . In recent years, Matuchova, et al had used the vertical Bridgman method to grow PbI 2 single crystal and adjusted the crystal stoichiometry by adding excess iodine (or lead) in the raw materials .…”

Growth of lead iodide single crystals used for nuclear radiation detection of Gamma‐rays

“…The transmission rate of the two crystals reaches 50% in the range of 4000∼400 cm −1 . This value is higher than that has been reported, generally 40∼45% . Based on the solid state physics theory, the theoretical infrared transmission rate of the PbI 2 crystal can be calculated to be 58.8% .…”