Some structural defects in YAlO3:Nd single crystals

Arsenev, P. A.; Vakhidov, Sh. A.; Ибрагимова, Э. М.

doi:10.1002/pssa.2210210153

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…Whilst phase changes might arise from an intrinsic lattice relaxation, as clearly exemplified by luminescence data for ammonium bromide [25], or potassium niobate [26], no such structural changes are expected for Nd:YAG. However phase instabilities have been considered in a study of YAlO 3 :Nd [27]. The present authors are conducting parallel work with several other oxide materials, such as bismuth germanate or MgO.…”

Section: Rl and CL During Heating Or Coolingmentioning

confidence: 99%

Low temperature luminescence from the near surface region of Nd:YAG

Maghrabi

Townsend

Vázquez

2001

J. Phys.: Condens. Matter

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Luminescence offers a sensitive probe of the quality of Nd:YAG laser material both in the bulk and, via cathodoluminescence, in the near surface layers. The spectral signals are primarily from the Nd dopants, but the thermoluminescence spectra reveal traces of impurities such as Tb, Cr and Mn. Control of the electron energy of the cathodoluminescence demonstrates that the outer few micron layers differ significantly in luminescence response from the bulk crystal. The cathodoluminescence signals are influenced by near surface dislocations and solvents from cleaning treatments. The effects are often apparent as discontinuities in the Nd signal intensities at temperatures which match the solid-liquid or liquid-gas phase transitions of contaminants. Additionally there is strong evidence for the inclusion of carbon dioxide, in the form of nanoparticles. At 202 K, the CO2 sublimation temperature, the Nd line intensities change discretely and there are wavelength shifts for some of the emission lines consistent with pressure driven changes in the lattice parameter. Data for x-ray lattice parameters identify a complex and sudden change and expansion of the lattice in this temperature region. The luminescence methods used suggest identification of impurities and gaseous inclusions can be exploited in other insulator materials and examples are cited.

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Section: Rl and CL During Heating Or Coolingmentioning

confidence: 99%

Low temperature luminescence from the near surface region of Nd:YAG

Maghrabi

Townsend

Vázquez

2001

J. Phys.: Condens. Matter

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“…In the case of crystals grown by the Czochralski method we observe the disappearance of the color on annealing (1200 °C) the crystal in a reducing (H 2 /N 2 ) atmosphere. Although some attempts − were made to solve the problem, there is still no clear explanation as to the nature of these color centers as well as their role and influence on the lasing properties of YAPs. We want to shed new light on these problems using XPS.…”

Section: Introductionmentioning

confidence: 99%

ESCA Studies of Yttrium Orthoaluminum Perovskites

et al. 1999

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Room temperature X-ray photoelectron spectroscopy (XPS or ESCA) has been employed to investigate pure single crystals of yttrium aluminum perovskite (YAlO 3 (YAP)) and YAlO 3 doped with several rare earth elements, Y 1-x Ln x AlO 3 (Ln ) Pr, Er, Ho). XPS peak shapes of the main elements forming the YAP structure, in structures that have been doped with ions of varying oxidation states, are rationalized as a function of structural environment and the oxidation state of doping ions. The significant changes in chemical shifts and full widths at half-maximum of the signals are caused by doping and the presence of color centers. The most distinctive change in chemical shifts is observed for the O(1s) peaks. Annealing in H 2 /N 2 atmosphere (1200 °C) changes the color of the sample, removing color centers due to relocation of oxygen ions in the structure. Although the total amount of oxygen in the samples does not change, the relative ratio of oxygen ions occupying two independent positions in the structure changes on annealing. Only in the case of YAlO 3 without color centers is the composition of crystal close to the stoichiometric one. Also the Y(3d) and Al(2p) signals are shifted to higher binding energies for doped YAP crystals.

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“…3. The luminescence of defect centers near 20000 cm -1 and 16400 cm -1 in γirradiated YAP crystals was observed by ARSENEV et al, 1974. 4).…”

Section: Resultsmentioning

confidence: 92%

“…Except the luminescence of Tm 3+ ions the wide and complex luminescence band in bluegreen region is observed in both YAP-Tm (4%) and YAP-Tm (1%) crystals (Fig. The luminescence near 16600 cm -1 and 15000 cm -1 in YAP crystals was observed by BARYSHEVSKY et al, 1993 and as well as luminescence observed by ARSENEV et al, 1974 was attributed to F-type centers. The luminescence maximum lie near 23000 cm -1 for YAP-Tm (4%) and 20500 cm -1 for YAP-Tm (1%).…”

Section: Resultsmentioning

confidence: 94%

Optical and Luminescence Properties of YAlO3 -Tm Crystals

Sugak¹,

Durygin

Matkovskii

et al. 2001

Zeitschrift für experimentelle und technische Kristallographie

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The results on optical absorption, photoluminescence and thermoluminescence of YAP‐Tm crystals of 1 at.% and 4 at.% of Tm are presented as well as influence of UV‐, γ‐radiation and thermal treatments on optical and luminescence properties of the crystals. The blue‐green luminescence of defect centers was observed in YAP‐Tm crystals at Ar+‐laser excitation. The possibility of energy transfer processes between defect centers and Tm3+ ions was shown.

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Some structural defects in YAlO3:Nd single crystals

Cited by 10 publications

References 6 publications

Low temperature luminescence from the near surface region of Nd:YAG

Low temperature luminescence from the near surface region of Nd:YAG

ESCA Studies of Yttrium Orthoaluminum Perovskites

Optical and Luminescence Properties of YAlO3 -Tm Crystals

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