Frequency dependence of loss tangent of thermally annealed undoped lead iodide crystals in the dark

127I and 207Pb Solid-State NMR Spectroscopy and Nuclear Spin Relaxation in PbI2: A Preliminary Study

“…2,5 The conductivity of lead iodide has been the subject of numerous investigations. 4,5,10,11,14,16,18,22,28,29,32,34 A study of the temperature dependence of the capacitance and loss tangent 5 indicates the presence of two thermally activated processes affecting its electrical response. The first process, with an activation energy of 0.087 eV (8.4 kJ/mol), is in the range of 288−348 K, and the second process, with a reported activation energy of 0.23 eV (22 kJ/mol), is dominant in the range of 348−393 K. These energies are very much smaller than the ionization energy of 10.45 eV (1.008 MJ/mol).…”

“…Lead iodide (PbI 2 ) is an ionic semiconductor useful in a variety of applications from image recording to room-temperature photocells, X-ray detectors, and low-energy γ-ray detectors. − The applications depend strongly on the nature of the structure and the resulting dynamics. In addition, the propensity toward cluster formation , and for taking up molecules in its layered structure has led to the study of the intercalation of molecules, ,, the study of colloidal nanoparticle suspensions, , and the development of nanobelt bundles .…”

“…Lead iodide (PbI 2 ) has unusual structural properties that result in interesting physical and electronic properties which make this ionic conductor/semiconductor a candidate for use in a variety of applications (see section ). − Despite many published reports using a variety of experimental probes, − the dynamics of the lead and iodine ions at the atomic level are not well understood. Techniques such as X-ray diffraction and neutron scattering provide static information at the atomic level. ,,,,, Techniques such as conductivity measurements ,,,,,,,,,,, give macroscopic information, where the dynamics of atoms can only be described by nonunique models. Although descriptions of atomic motion in this material are model-dependent, 207 Pb and 127 I nuclear magnetic resonance (NMR) experiments can considerably reduce the range of potentially successful models.…”

Fabrication and properties of polyimide composites filled with zirconium tungsten phosphate of negative thermal expansion

“…The dielectric behavior of a dielectric material under the action of an alternating charging current is often described by a frequency-dependent complex dielectric constant, ε (jω) and can be defined as follows [41]:…”

Dielectric Dispersion at Microwave Frequencies of Some Low Loss Mixed Oxide Perovskites

“…Many efforts have been made to understand the frequency dependent of complex permittivity, ε − jε [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Far infrared reflectivity spectra were usually obtained and transformed to the complex dielectric data by the Kramers-Kronig procedure and the classical oscillator model [6][7][8][9][10][11][12][13][14][15][16].…”