Ionic transport properties in AgCl under high pressures

Abstract

Ionic transport behaviors of silver chloride (AgCl) have been revealed with impedance spectra measurement under high pressures up to 20.4 GPa. AgCl always presented ionic conducting under experimental pressures, but electronic conduction can coexist with ionic conduction within the pressure range from 6.7 to 9.3 GPa. The ionic conductivity of AgCl decreases by three orders of magnitude under compression, indicating that Ag+ ion migrations are suppressed by high pressure. A parameter, fW, was defined as the starting frequency at which Ag+ ions begin to show obvious long-distance diffusion in AgCl. fW showed a similar trend with the ionic conductivity under high pressures, indicating that the speed of Ag+ ion diffusion slows down as the pressure increases. Unlike AgI, Ag+ ion diffusion in AgCl is controlled by the indirect-interstitial mechanism. Due to stronger ionic bonds and larger lattice deformation, Ag+ ion diffusion in the rigid Cl− lattice is more difficult than in the I− lattice under high pressures.

Large Band Gap Narrowing and Prolonged Carrier Lifetime of (C4H9NH3)2PbI4 under High Pressure

“…Detailed information is illustrated in the Supporting Information. As shown in Figure S1a of the Supporting Information, at ambient conditions, a semicircle occurred at a higher frequency and an inclined upward straight tail at lower frequency could be observed, which suggested BA 2 PbI 4 presents ionic transport behaviors . Early works on OIHPs have also provided evidences for ionic conduction, in agreement with our observation on BA 2 PbI 4 .…”

Pressure effects on the ionic transport properties of LiNH2

“…Once the signal frequency decreases to 0 Hz, the imaginary parts for the pure electronic and ionic impedances are equal to 0 and infinity, respectively. 17 Therefore, ionic conduction and electronic conduction have a parallel relationship in this pressure range. The impedance spectra show a variation trend from low-impedance state to high-impedance state and then to low-impedance state with an increasing pressure.…”

“…The value of f W is directly proportional to the migration rate of mobile ions. 17,18 The pressure-dependent f W is shown in Fig. 3(d).…”

“…Further details of the electrodes and sample configuration are illustrated in ref. 17 and 18. The impedance spectra measurements were conducted from 10 −1 to 10 7 Hz with an amplitude of 0.1 V.…”

Pressure-Induced Ionic-Electronic Transition in BiVO4*

“…We define the frequency of the connecting point as 𝑓 w . [23] It denotes the frequency at which the long-range diffusion of O 2− ions begins. The higher the 𝑓 w is, the faster the O 2− ions migrate.…”