Perturbed-angular-correlation measurements of trivalent indium defects in silver chloride

Austin, J. C.; Swanson, M. L.; Hughes, W. C.; Kao, Chien-Teh; Slifkin, Lawrence; Hofsäß, H.; Frey, Eric

doi:10.1103/physrevb.42.7699

Cited by 11 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This defect is identical in every respect-except for the smaller quadrupole interaction frequency-with the 43 MHz defect seen in AgCl [12,13]. The change in ν Q between AgCl and AgBr is roughly what is expected from the change in the lattice constant.…”

Section: Structure Of the 12 K Defect Complexmentioning

confidence: 52%

“…The asymmetry parameter of the AgBr defect is dramatically different from the η ≈ 0 reported for the AgCl defect [12]. If we are to assign the configuration of figure 6 to the 20 MHz complex in AgBr, this difference must be accounted for.…”

Section: Structure Of the 100 K Defect Complexmentioning

confidence: 71%

“…Previously, we made detailed PAC measurements in AgCl using the radioactive isotope 111 In 3+ as a cation probe. We found that two unique In-vacancy configurations predominate below 130 K, both having 100 axial symmetries [12]. Both of these defects apparently consist of two vacancies at NNN positions to the indium probe ion, one having vacancies collinear with respect to the In atom, the other having vacancies that form a right triangle with the probe ion at the vertex.…”

Section: Introductionmentioning

confidence: 89%

“…Considering the similarities in the properties of these two materials (AgCl and AgBr) it is reasonable to identify this 20 MHz complex in AgBr with the ν Q = 21.5 MHz, η = 0 complex in AgCl. In AgCl an indium-divacancy complex was proposed to account for this interaction, the two vacancies occupying nextnearest silver sites forming a right angle with the indium at the vertex [12,13]. Such a complex is shown schematically in figure 6.…”

Section: Structure Of the 100 K Defect Complexmentioning

confidence: 99%

See 3 more Smart Citations

Perturbed-angular-correlation measurements of trivalent indium defects in silver bromide

Austin

Price

Patnaik

et al. 1996

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The structure and thermodynamics of defects involving ions and charge-compensating silver vacancies in AgBr were studied using perturbed angular correlation (PAC) spectroscopy. We saw two main defect configurations, both attributed to two Ag vacancies bound to the ion at next-nearest-silver-neighbour positions. A reversible transition occurred between the two configurations at approximately 80 K. The predominant complex below 80 K has and . The `zz' axis of the electric field gradient (EFG) tensor for this complex points along a crystal axis. This complex is attributed to a collinear configuration with two silver vacancies at next-nearest-neighbour sites on opposite sides of the indium ion. The other complex, predominant between 80 K and the onset of diffusion-induced damping near 200 K, has and . The `zz' axis of the EFG tensor for this complex also lies along a crystal axis. This complex is attributed to a configuration with two silver vacancies at next-nearest sites, forming a right triangle with the indium probe at the vertex. A third complex occurs near the transition, characterized by , but the quadrupole interaction parameters for this complex could not be precisely determined. The transition between the complexes that dominate above and below 80 K is reported and analysed in terms of equilibrium thermodynamics, allowing determination of differences in the formation enthalpy h and entropy s for the two complexes. We obtain , and . Structural studies for other trivalent impurities in AgBr are briefly reviewed, and the PAC results are compared with those results and with earlier PAC results for in AgCl.

show abstract

Section: Structure Of the 12 K Defect Complexmentioning

confidence: 52%

Section: Structure Of the 100 K Defect Complexmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 89%

Section: Structure Of the 100 K Defect Complexmentioning

confidence: 99%

See 2 more Smart Citations