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Lenting, B. P. M.; Numan, J. A. J.; Bijvank, E. J.; Hartog, H. W. den

doi:10.1103/physrevb.14.1811

Phys. Rev. B

1976

DOI: 10.1103/physrevb.14.1811

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Reorientation of dipoles inSrF2:R3+

B. P. M. Lenting¹,

J. A. J. Numan²,

E. J. Bijvank³

et al.

Abstract: Measurements of dipole relaxation of two types of R '+-interstitial complexes in SrF,:R + single crystals using the ionic-thermocunents method are reported. For the light elements in the series of Ianthanides we have found relaxations due to tetragonal complexes, whereas in crystals doped with heavy R'+ ions such as Dy'+, Ho'+, etc. , the predominant defects have trigonal symmetry. The variation of the activation energy as a function of the R '+ radius is discussed. In addition, the effect of the impurity conc… Show more

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Cited by 65 publications

References 15 publications

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Thermally Stimulated Discharge Currents in Pure and Doped Sodium Yttrium Fluoride

Shareefuddin

Chary

1993

Cryst. Res. Technol.

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The thermally stimulated discharge currents (TSDC) of pure NaYF,, and NaYF, doped with 0.5 mole% Sm (in the form of SmF,) have been studied as function of polarizing temperature and polarizing field strength at a constant heating rate (b) = 0.05 Ks-'. The activation energies, relaxation parameters and charge were evaluated. The origin of TSDC spectra in NaYF, : Sm is attributed to space charge polarization. Whereas both dipolar and space charge process are found to operate in NaYF, sample.

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Thermally Stimulated Discharge Currents in Pure and Doped Sodium Yttrium Fluoride

Shareefuddin

Chary

1993

Cryst. Res. Technol.

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Optical and Depolarization Spectroscopy of Doubly Doped Alkaline‐Earth Fluorides

Раджабов

2020

Physica Status Solidi (b)

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The process of recharging heterogeneous lanthanides in SrF2 and BaF2 crystals is studied by parallel measurements of optical absorption spectra and thermodepolarization curves. Electron transfer between lanthanides Yb2+–Nd3+, Eu2+–Yb3+ in SrF2, and between Yb2+–Nd3+, Eu2+–Yb3+, and Yb2+–Dy3+ in BaF2 is studied. Electron phototransfer between lanthanides, registered by a change in the absorption bands of divalent lanthanides, is accompanied by a backward migration of charge‐compensating interstitial fluorine, which is detected by a change in the corresponding thermodepolarization peaks of .

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EPR Investigations of ADP:Cr³⁺ above and below T_C

Diemer

Bijvank

Hartog

1978

Physica Status Solidi (b)

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C++ impurities in ADP crystals have bten investigated employing the EPR technique. A detailed study has been made at temperatures higher than the Curie temperature; it is suggested that the Cr3+ impurities are located at an NH: site which is accompanied by two neighboring proton vacancies. This is concluded from the directions of the principal axes with respect to the crystal axes. In the paraelectric phase there is only one type of CrS+ center but below Tc there are two different centers probably due to different arrangements of the H+ vacancies.W+-Storstellen in ADP-Kristallen wurden mit der EPR-Technik untersucht. Eine ausfiihrliche Untersuchung wurde bei Temperaturen oberhalb der Curietemperatur durchgefiihrt ; es wird angenommen, daD die Crs+-Storstelle an einem NHi-Platz lokalisiert ist, der von zwei benachbarten Protonenleerstellen umgeben ist. Dies wird aus der Richtung der Hauptachsen beziiglich der Kristallachsen geschlossen. I n der paramagnetischen Phase existiert nur ein Typ von C++-Zentren; jedoch existieren unterhalb TC zwei verschiedene Zentren, die wahrscheinlich auf unterschiedliche Anordnungen der H+-Leerstellen zuriickgefiihrt werden konnen.

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Reorientation of dipoles inSrF2:R3+

Cited by 65 publications

References 15 publications

Thermally Stimulated Discharge Currents in Pure and Doped Sodium Yttrium Fluoride

Thermally Stimulated Discharge Currents in Pure and Doped Sodium Yttrium Fluoride

Optical and Depolarization Spectroscopy of Doubly Doped Alkaline‐Earth Fluorides

EPR Investigations of ADP:Cr³⁺ above and below T_C

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Reorientation of dipoles inSrF2:R3+

Cited by 65 publications

References 15 publications

Thermally Stimulated Discharge Currents in Pure and Doped Sodium Yttrium Fluoride

Thermally Stimulated Discharge Currents in Pure and Doped Sodium Yttrium Fluoride

Optical and Depolarization Spectroscopy of Doubly Doped Alkaline‐Earth Fluorides

EPR Investigations of ADP:Cr3+ above and below TC

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Product

Resources

About

EPR Investigations of ADP:Cr³⁺ above and below T_C