The Fe3+-O2- pair in the diamagnetic AMF3 perovskites: A sensitive probe for EPR investigations of structural phase changes

Buzaré, Jean‐Yves; Fayet, J. C.

doi:10.1016/0038-1098(77)90315-5

Cited by 30 publications

(15 citation statements)

References 9 publications

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“…The change in the fine structure splitting upon lowering the symmetry from cubic to tetragonal during the structural phase transition was observed. More recently, a similar phase transition was studied in perovskites of the type AMF, by Buzare et al [7], where the shf structure can be observed. An example is RbCdFj with the defect Fe3+-0'-a s a probe.…”

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confidence: 73%

Recent developments in magnetic resonance studies of defects in ionic crystals

Spaeth

1980

J. Phys. Colloques

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RCsumB. -Des applications rkcentes de RPE, RMN et ENDOR sont brikement passkes en revue pour les investigations suivantes : effets de mouvement de dtfauts ponctuels, influence du changement de phase structurale sur des dtfauts, autodiffusion, mouvement de dislocation, structure des dkfauts de basse symttrie, ktats excites de dkfauts. La mkthode de la rtvklation des spectres RPE par le comportement des raies d'ENDOR est brikement dtcrite pour I'application aux dtfauts du corps solide. Elle rend possible I'analyse des spectres RPE et ENDOR superposks dus 9 plusieurs dtfauts et facilite aussi l'analyse des spectres ENDOR de dkfauts de b-asse symktrie.Abstract. -Recent applications of ESR, NMR and ENDOR to the following investigations are briefly reviewed : motional effects of point defects, influence of structural phase transitions on defects, self diffusion, dislocation motion, structure of low symmetry defects, excited states of defects. The application of ENDOR-induced ESR to solid state defects is briefly described. It allows the analysis of superimposed ESR and ENDOR spectra due to several defects and facilitates also the analysis of ENDOR spectra of low symmetry defects.

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confidence: 73%

Recent developments in magnetic resonance studies of defects in ionic crystals

Spaeth

1980

J. Phys. Colloques

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“…This rotation is described by the angle y (see figure 1). which is taken as the order parameter of the weakly discontinuous phase transition (Buzare and Fayet 1977). In addition an elongation of the octahedra along their rotational axis occurs, resulting in a tetragonal crystal symmetry (DJh) below T,.…”

Section: Crystal Properties and Experimental Detailsmentioning

confidence: 99%

Quasisteady-state model of a laser corona of spherical and cylindrical targets

Demchenko¹,

Розанов²,

Schlegel³

1988

Sov. J. Quantum Electron.

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The structural phase transition in RbCdFl at 124 K from cubic to tetragonal symmetry was studied by investigating the paramagnetic .%In' -and Fe.'-probes with EKDOR. From the superhyperfine interactions the order parameter could be inferred. It is shown that the phase transition is weakly of first order. The lattice relaxation about the probe causes the order parameter to be a 'local' one. which differs from first to third shell of neighbours around the probe ion. The results demonstrate the limitations of the use of probes to study the intrinsic crystal properties.C32-K

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“…In the last years much attention has been paid to the investigations of transition-metal (TM) ions doped into fluoroperovskite-type AMF 3 crystals (A represents an alkali metal and M represents an alkaline-earth metal ion) [1][2][3][4][5][6][7][8][9][10]. Magnetic impurity ions doped in the layered perovskite fluorides are expected to substitute for host cations and form the magnetic impurity center.…”

Section: Introductionmentioning

confidence: 99%