High-resolution near-infrared luminescence of mangenese(V) in tetrahedral oxo coordination

Herren, Markus; Güdel, Hans U.; Albrecht, Ch.; Reinen, D.

doi:10.1016/0009-2614(91)85106-7

Cited by 48 publications

(18 citation statements)

References 9 publications

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“…In our further discussion below we will reveal another important similarity in paramagnetic properties of Mn-doped YAlO 3 and CaYAlO 4 crystals, the existence of Mn 5ϩ ions (Sϭ1) in octahedral Al sites. This finding deserves special attention, because due to relatively small size of the Mn 5ϩ ion ͑ionic radius 0.33 Å͒, 43 it usually occupies tetrahedral sites, if available, in host crystals such as Ba 3 (VO 4 ) 2 , 44,45 Ba 5 (PO 4 ) 3 Cl, and Ca 2 VO 4 Cl, 46 and Sr 5 (PO 4 ) 3 Cl. 47,48 In YAlO 3 and CaYAlO 4 crystals there are no tetrahedral sites available for Mn 5ϩ ions.…”

Section: Resultsmentioning

confidence: 99%

Low-field microwave response and electron paramagnetic resonance identification of valence states of manganese including octahedral Mn5+ in YAlO3 and CaYAlO4

Рахимов

Jackson

Jones

et al. 2004

Journal of Applied Physics

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Zero-field signal in the electron paramagnetic resonance spectrum of Mn +2 in silicate glassesMicrowave response near zero magnetic field has been observed in YAlO 3 and CaYAlO 4 crystals dilutely doped with Mn in concentration ranging from 0.005 to 0.2 at. %. The response is due to magnetic-field-dependent nonresonant microwave losses, which co-exist with normal electron paramagnetic resonance ͑EPR͒ absorption due to Mn 2ϩ , Mn 4ϩ , and Mn 5ϩ ions in YAlO 3 and CaYAlO 4 . The valence states of manganese have been identified using a dual mode EPR cavity that allowed spectrum recording with polarization of the magnetic vector B 1 of the microwave perpendicular or parallel to the static magnetic field B 0 . The Mn 2ϩ ion, electron spin Sϭ 5 2 , and Mn 4ϩ , Sϭ 3 2 have been identified using normal B 1 ЌB 0 polarization, while Mn 5ϩ , Sϭ1, in unusual octahedral position, has been identified using B 1 ʈ B 0 polarization. The low-field response did not depend on mutual orientation of the vectors B 1 and B 0 and had the opposite phase with respect to the paramagnetic absorption. This shows that Mn-doped YAlO 3 and CaYAlO 4 exhibit magnetically induced microwave absorption, which has a minimum at zero magnetic field and increases with the applied magnetic field. The response in Mn-doped YAlO 3 increases with the introduction of Ca 2ϩ ions. The existence of manganese in different valence states, particularly metastable Mn 5ϩ in octahedral position, and the effect of calcium co-doping suggest the formation of relatively free charge carriers that can migrate in the vicinity of paramagnetic manganese ions. The spin-dependent mechanism of the charge migration is discussed to explain magnetoinduced microwave losses.

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Section: Resultsmentioning

confidence: 99%

Low-field microwave response and electron paramagnetic resonance identification of valence states of manganese including octahedral Mn5+ in YAlO3 and CaYAlO4

Рахимов

Jackson

Jones

et al. 2004

Journal of Applied Physics

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“…A much higher charged ion like Mn 5 ÷ also shows emission [45]. Due to the high crystal field, this emission is due to the 1E--*3A2 transition.…”

Section: Luminescence Of Transition Metal Ionsmentioning

confidence: 94%

Vibrational structure in the luminescence spectra of ions in solids

Blasse

1994

Topics in Current Chemistry

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“…͑2͒ The absence of tetrahedral sites in YAlO 3 ; ͑3͒ The obvious likeness of the absorption and emission spectra of photodarkened Mn:YAlO 3 with those of Mn 5ϩ ions in tetrahedral coordination [6][7][8][9] and V 3ϩ and Ti 2ϩ ions in octahedral coordination. [10][11][12][13][14][15] ͑According to Ref.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic characterization of photoinducedMn5+ions inYAlO3
Noginov
¹
,
Loutts
²
,
Ногинова
³

et al. 2000
Phys. Rev. B
31
1
30
0
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We have spectroscopically studied the photoinduced color center in Mn:YAlO 3 , the promising material for holographic data storage. We have proved that grayish-bluish coloration in photoexposed Mn:YAlO 3 is due to Mn 5ϩ ions in octahedral sites. We assign the main features observed in the absorption and emission spectra of photodarkened Mn:YAlO 3 to the 1 T 2 (t 2 2 ), 3 T 2 (t 2 e), 3 T 1 (t 2 e), 1 A 1 (t 2 2 ), and 3 A 2 (e 2 ) excited states of Mn 5ϩ .We show that Mn 5ϩ ions can be stabilized in Mn:YAlO 3 codoped with Ca ions and in the crystals grown in reducing atmosphere and subsequently annealed in air at 310-460°C.

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High-resolution near-infrared luminescence of mangenese(V) in tetrahedral oxo coordination

Cited by 48 publications

References 9 publications

Low-field microwave response and electron paramagnetic resonance identification of valence states of manganese including octahedral Mn5+ in YAlO3 and CaYAlO4

Low-field microwave response and electron paramagnetic resonance identification of valence states of manganese including octahedral Mn5+ in YAlO3 and CaYAlO4

Vibrational structure in the luminescence spectra of ions in solids

Spectroscopic characterization of photoinducedMn5+ions inYAlO3
Noginov
¹
,
Loutts
²
,
Ногинова
³

et al. 2000
Phys. Rev. B
31
1
30
0
View full text Add to dashboard Cite

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High-resolution near-infrared luminescence of mangenese(V) in tetrahedral oxo coordination

Cited by 48 publications

References 9 publications

Low-field microwave response and electron paramagnetic resonance identification of valence states of manganese including octahedral Mn5+ in YAlO3 and CaYAlO4

Low-field microwave response and electron paramagnetic resonance identification of valence states of manganese including octahedral Mn5+ in YAlO3 and CaYAlO4

Vibrational structure in the luminescence spectra of ions in solids

Spectroscopic characterization of photoinducedMn5+ions inYAlO3Noginov1, Loutts2, Ногинова3 et al. 2000Phys. Rev. B311300View full textAdd to dashboardCite

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Spectroscopic characterization of photoinducedMn5+ions inYAlO3
Noginov
¹
,
Loutts
²
,
Ногинова
³

et al. 2000
Phys. Rev. B
31
1
30
0
View full text Add to dashboard Cite