Spin and valence states of manganese ions in manganese-doped yttrium orthoaluminate

Рахимов, Р. Р.; Wilkerson, Amy; Loutts, G. B.; Noginov, M. A.; Ногинова, Н.; Lindsay, W. L.; Ries, H.

doi:10.1016/s0038-1098(98)00403-7

Cited by 42 publications

(39 citation statements)

References 7 publications

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“…The latter is distinguishable only by the low field part of the three-component fine structure in the EPR spectrum of Mn 4. This feature of the EPR spectrum of Mn" in CaYAIO 4 is similar to that observed for the Mn4+ ion in YAIO [8] and implies that Mn"' occupies octahedral aluminum site. In the case of CaYAIO 4 , the EPR spectra show that manganese is predominantly present in the form of Mni2+ and, apparently, occupies the Ca 2 ' site with no need for the charge compensation.…”

Section: "7supporting

confidence: 77%

“…[8]. Two paramagnetic charge states of manganese, Mn 2 ÷ (total electron spin S = 5/2) and Mn4+ (S = 3/2) were identified.…”

Section: Methodsmentioning

confidence: 97%

“…[8] that co-doing of the YA10 3 crystal with Ce decreases the amount of Mn4' due to its reduction to Mn and results in the disappearance of the Mn 4 ÷ EPR spectrum. In this crystal we further found that both Mn 2 + EPR signal and low field response are not affected by the presence of Ce.…”

Section: "7mentioning

confidence: 96%

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Study of the Low Field Microwave Response in Yttrium Aluminates Dilutely Doped with Manganese

2002

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Microwave response near zero magnetic field was observed in YAIO 3 and CaYAIO 4 crystals dilutely doped with Mn in concentration ranging from 0.05 to 2 atomic %. The response is due to non-resonant microwave absorption, which co-exists with normal electron paramainetic resonance (EPR) absorption due to different paramagnetic valence states of manganese. Mn + and Mrn charge states were identified in Mn-doped YA10 3 , and Mn 2 +, W+ and MnW+ in Mndoped CaYAlO 4 , The low field response has the opposite phase with respect to the paramagnetic absorption. This shows that Mn-doped YAIO 3 and CaYAIO4 exhibit magnetically induced microwave absorption, which has a minimum at zero magnetic field and increases with the applied magnetic field. This effect is similar to microwave magneto-resistance effects observed in manganite perovskites, where spin-dependent electron tunneling occurs between ferromagnetically coupled manganese ions in different valence states. We show, however, that in the present case of diluted paramagnetic systems, magneto-induced microwave losses are due to intramolecular spin-dependent tunneling, where central paramagnetic ion does not change its charge state and spin-dependent charge migration occurs in the first coordination sphere of 2+ paramagnetic ion. Evidences are presented that this ion is Mn exhibiting the highest electron spin S = 5/2.

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Section: "7supporting

confidence: 77%

“…[8]. Two paramagnetic charge states of manganese, Mn 2 ÷ (total electron spin S = 5/2) and Mn4+ (S = 3/2) were identified.…”

Section: Methodsmentioning

confidence: 97%

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Study of the Low Field Microwave Response in Yttrium Aluminates Dilutely Doped with Manganese

2002

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“…Manganese ions in YAlO 3 :Mn crystals as a rule are present in the form of Mn 4+ ions in octahedral coordination (Al 3+ positions) and Mn 2+ ions in strongly distorted dodecahedral coordination (Y 3+ positions) [1,[6][7][8][9]. The crystals being exposed to blue-green laser light show an intensive bluish-gray coloration caused by Mn 5+ ions created as a result of the Mn 4+ → Mn 5+ + e − photoionization process [1,2,6].…”

Section: Introductionmentioning

confidence: 99%

“…The crystals being exposed to blue-green laser light show an intensive bluish-gray coloration caused by Mn 5+ ions created as a result of the Mn 4+ → Mn 5+ + e − photoionization process [1,2,6]. In such a way the Mn 4+ ions demonstrate sensitivity to the visible light exposure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Manganese Concentration on Thermoluminescent Properties of YAlO₃:Mn Crystals

et al. 2010

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This work is devoted to experimental study of the effect of manganese concentration on thermoluminescent properties of YAlO3:Mn crystals grown by the Czochralski method. A new type of emitting centers beside of Mn 4+ and Mn 2+ ions was revealed at low concentration of manganese ions in the crystal. These centers are responsible for the high-temperature thermoluminescent peak at 570 K. A potential of this thermoluminescent peak for thermoluminescence dosimetry application is discussed.

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YAlO₃:Mn nanocrystals obtained in sol‐gel and their properties

Talik

Baran

Skrzypek

et al. 2010

Cryst. Res. Technol.

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Manganese-doped yttrium aluminum perovskite (YAP) nanocrystalline samples of 0.05 at%, 0.2 at% and the reference single crystal of predicted 0.02 at% Mn, 0.02% Si concentration in YAP were investigated by the following methods: X-ray powder diffraction, scanning electron microscopy, EPR, SQUID and XPS. These examinations revealed that the obtained material was not single phase and the trace of Y 3 Al 5 O 12 (YAG) appeared. As is evident from EPR studies, the manganese in all investigated samples is occupying an yttrium site and the valence of manganese remains as Mn 2+. The EPR spectra of both powder YAP:Mn samples are the same, an expected difference in the intensity well reflects the nominal concentration of manganese. The single crystal perovskite YAlO 3 doped with manganese showed very complex and strongly anisotropic EPR spectrum. The EPR data showed the presence of Mn 2+ ions substituting yttrium site and Cr 3+ and Fe 3+undesirable impurities which occupied aluminum site. The magnetic moments of manganese calculated for the nanopowders confirmed Mn 2+ state. The SEM/EDS and XPS analyses showed the chemical composition of nanopowders as very consistent for both methods. For both samples the lower content of aluminum in relation to the nominal value was found. The SEM images show that the sample 0.2 at% Mn has more agglomerated structure.

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Spin and valence states of manganese ions in manganese-doped yttrium orthoaluminate

Cited by 42 publications

References 7 publications

Study of the Low Field Microwave Response in Yttrium Aluminates Dilutely Doped with Manganese

Study of the Low Field Microwave Response in Yttrium Aluminates Dilutely Doped with Manganese

Effect of Manganese Concentration on Thermoluminescent Properties of YAlO₃:Mn Crystals

YAlO₃:Mn nanocrystals obtained in sol‐gel and their properties

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Spin and valence states of manganese ions in manganese-doped yttrium orthoaluminate

Cited by 42 publications

References 7 publications

Study of the Low Field Microwave Response in Yttrium Aluminates Dilutely Doped with Manganese

Study of the Low Field Microwave Response in Yttrium Aluminates Dilutely Doped with Manganese

Effect of Manganese Concentration on Thermoluminescent Properties of YAlO3:Mn Crystals

YAlO3:Mn nanocrystals obtained in sol‐gel and their properties

Contact Info

Product

Resources

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Effect of Manganese Concentration on Thermoluminescent Properties of YAlO₃:Mn Crystals

YAlO₃:Mn nanocrystals obtained in sol‐gel and their properties