On the Hydration of the Rare Earth Ions in Aqueous Solution

In this paper, MgSO4:Dy,MgSO4:Tm and MgSO4:Mn phosphors are prepare by high temperature solid state reaction. The MgSO4:Dy or MgSO4:Tm powder are mixed and sintered with MgSO4:Mn respectively to obtain the co-doped MgSO4:Dy,Mn and MgSO4:Tm,Mn phosphors. The 3-dimensional thermoluminescence spectra of these two phosphors under different sintering temperature are measured.Results show that when the sintering temperature is below 800°C, Dy, Tm and Mn ions emissions are independent. However, when the sintering temperature was over 800°C, the emission peak of Mn becomes weaker, and so do the low temperature peaks of Dy and Tm, while the high temperature peaks of Dy and Tm become stronger. This indicated that the defect complex structure in the formation of the thermoluminescence material depends on the sintering temperature. As the sintering temperature rises, more and more Mn ions combine with the rare earth ions. Therefore, the luminescence process of the energy transfer of Mn ions to the rare earth ions can be observed and the suppression to low temperature peaks of Tm and Dy, and also shown in spectra.

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G-type Antiferromagnetism and Orbital Ordering due to the Crystal Field from the Rare-Earth Ions Induced by the GdFeO3-type Distortion inRTiO3WhereR=La, Pr, Nd and Sm

Journal of the Physical Society of Japan ◽

10.1143/jpsj.73.1833 ◽

2004 ◽

Vol 73 (7) ◽

pp. 1833-1850 ◽

Cited By ~ 24

Author(s):

Masahito Mochizuki ◽

Masatoshi Imada

Keyword(s):

Rare Earth ◽

Crystal Field ◽

Rare Earth Ions ◽

Orbital Ordering ◽

The Rare Earth

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TRANSPORT PROPERTIES OF THE RARE EARTH DISORDERED SYSTEMS (R1−xYbx)Ba2Cu3O7 (R = Y, Sm)

International Journal of Modern Physics B ◽

10.1142/s0217979288001219 ◽

1988 ◽

Vol 02 (06) ◽

pp. 1395-1398

Author(s):

J. R. HWANG ◽

M. F. TAI ◽

H. C. KU ◽

W. N. WANG ◽

K. H. LII

Keyword(s):

Electrical Resistivity ◽

Rare Earth ◽

Conduction Electron ◽

Disordered Systems ◽

Magnetic Measurements ◽

Mass Difference ◽

Rare Earth Ions ◽

Size Difference ◽

Compositional Variation ◽

The Rare Earth

Electrical and magnetic measurements have been carried out for the rare earth disordered superconducting copper oxide systems ( Y 1−x Yb x) Ba 2 Cu 3 O 7 (substitution with large rare earth mass difference) and ( Sm 1−x Yb x) Ba 2 Cu 3 O 7 (substitution with large rare earth ionic size difference). Effect of compositional variation upon room temperature electrical resistivity shows no disorder scattering contribution from the randomly distributed rare earth ions located on the (1/2, 1/2, 1/2) site of the space group Pmmm. This result indicates very low conduction electron density of states surrounding rare earth ions. On the contrary, negative deviation of electrical resistivity from the linear Vegard law was observed. This reduced conduction electron scattering was discussed through the variation of packing density, grain size and/or twin structure.

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