EPR investigation of Gd3+ and Eu2+ in the α‐ and β‐phases of lead phosphate

M. Razeghi*, J. P. Buisson, B. Houlier

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The X‐band EPR spectra of Gd3+ and Eu2+ diluted in Pb3(PO4)2 crystals are studied. Lead phosphate exhibits a ferroelastic phase transition at 180°C and the EPR spectra obtained in each phase differ from each other. The spectra are very complex because the zero field splitting has the same order of magnitude as the Zeeman term. The spin Hamiltonian parameters and the energy levels are computed. “Forbidden” or “missing” transitions and line intensities can be explained. Very likely Gd3+ substitute a PbI ion. For Gd3+ in β‐phase g ≈ 2 and b 20 = 990 × × 10−4 cm−1 (200°C); for Gd3+ in α‐phase at 25°C g ≈ 2, b 20 = 930 × 10−4 cm−1 and b 22 = −77 × × 10−4 cm−1.

Original languageEnglish (US)
Pages (from-to)283-289
Number of pages7
Journalphysica status solidi (b)
Volume95
Issue number1
DOIs
StatePublished - Jan 1 1979

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Paramagnetic resonance
phosphates
Phosphates
Lead
Hamiltonians
Electron transitions
Electron energy levels
forbidden transitions
Phase transitions
Ions
Crystals
energy levels
substitutes
crystals
lead phosphate
ions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

@article{51227740e6994aa782ce5cee558073e8,
title = "EPR investigation of Gd3+ and Eu2+ in the α‐ and β‐phases of lead phosphate",
abstract = "The X‐band EPR spectra of Gd3+ and Eu2+ diluted in Pb3(PO4)2 crystals are studied. Lead phosphate exhibits a ferroelastic phase transition at 180°C and the EPR spectra obtained in each phase differ from each other. The spectra are very complex because the zero field splitting has the same order of magnitude as the Zeeman term. The spin Hamiltonian parameters and the energy levels are computed. “Forbidden” or “missing” transitions and line intensities can be explained. Very likely Gd3+ substitute a PbI ion. For Gd3+ in β‐phase g ≈ 2 and b 20 = 990 × × 10−4 cm−1 (200°C); for Gd3+ in α‐phase at 25°C g ≈ 2, b 20 = 930 × 10−4 cm−1 and b 22 = −77 × × 10−4 cm−1.",
author = "M. Razeghi and Buisson, {J. P.} and B. Houlier",
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EPR investigation of Gd3+ and Eu2+ in the α‐ and β‐phases of lead phosphate. / Razeghi, M.; Buisson, J. P.; Houlier, B.

In: physica status solidi (b), Vol. 95, No. 1, 01.01.1979, p. 283-289.

Research output: Contribution to journalArticle

TY - JOUR

T1 - EPR investigation of Gd3+ and Eu2+ in the α‐ and β‐phases of lead phosphate

AU - Razeghi, M.

AU - Buisson, J. P.

AU - Houlier, B.

PY - 1979/1/1

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N2 - The X‐band EPR spectra of Gd3+ and Eu2+ diluted in Pb3(PO4)2 crystals are studied. Lead phosphate exhibits a ferroelastic phase transition at 180°C and the EPR spectra obtained in each phase differ from each other. The spectra are very complex because the zero field splitting has the same order of magnitude as the Zeeman term. The spin Hamiltonian parameters and the energy levels are computed. “Forbidden” or “missing” transitions and line intensities can be explained. Very likely Gd3+ substitute a PbI ion. For Gd3+ in β‐phase g ≈ 2 and b 20 = 990 × × 10−4 cm−1 (200°C); for Gd3+ in α‐phase at 25°C g ≈ 2, b 20 = 930 × 10−4 cm−1 and b 22 = −77 × × 10−4 cm−1.

AB - The X‐band EPR spectra of Gd3+ and Eu2+ diluted in Pb3(PO4)2 crystals are studied. Lead phosphate exhibits a ferroelastic phase transition at 180°C and the EPR spectra obtained in each phase differ from each other. The spectra are very complex because the zero field splitting has the same order of magnitude as the Zeeman term. The spin Hamiltonian parameters and the energy levels are computed. “Forbidden” or “missing” transitions and line intensities can be explained. Very likely Gd3+ substitute a PbI ion. For Gd3+ in β‐phase g ≈ 2 and b 20 = 990 × × 10−4 cm−1 (200°C); for Gd3+ in α‐phase at 25°C g ≈ 2, b 20 = 930 × 10−4 cm−1 and b 22 = −77 × × 10−4 cm−1.

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