Rare-earth ionic size effects on Tc in the series RBa2Cu3O7-σ

Rare-earth aluminates, LnAlO3 (Ln = Dy, Er, Gd, La, Nd, Pr, Sm, and Y) were prepared using the mixed oxide method, and their microwave dielectric properties were examined at X-band. Most rare-earth aluminates have suitable permittivities and quality factors for applications as dielectric resonators, but a modification of τf is necessary due to the coefficient's large negative value. When considering dielectric properties and lattice matching, YalO3 rather than LaAlO3, was suggested as a promising substrate material for microstrip antennas utilizing high-temperature superconductor thin films. Rare-earth aluminates with a rhombohedral structure exhibited larger permittivities than those with an orthorhombic structure. This difference was attributed to the difference in ionic size and coordination number. It was demonstrated that a nonzero magnetic susceptibility of rare-earth aluminates has an adverse effect on their quality factor. An abrupt variation in the temperature coefficient of permittivity was discussed in terms of oxygen octrahedra tilting.

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Ionic size effects on the thermal expansion coefficient in NaCl-type alkali halides

Acta Crystallographica Section A ◽

10.1107/s0567739474000209 ◽

1974 ◽

Vol 30 (1) ◽

pp. 105-106 ◽

Cited By ~ 5

Author(s):

A. A. Khan

Keyword(s):

Thermal Expansion ◽

Thermal Expansion Coefficient ◽

Expansion Coefficient ◽

Size Effects ◽

Alkali Halides ◽

Ionic Size

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Ionic size effect due to a nonclassical percolation process on the superconductor-insulator transition inR1−xPrxBa2Cu3O7−δ(R=rare earth)

Physical Review B ◽

10.1103/physrevb.76.024514 ◽

2007 ◽

Vol 76 (2) ◽

Cited By ~ 5

Author(s):

Katsukuni Yoshida

Keyword(s):

Rare Earth ◽

Size Effect ◽

Insulator Transition ◽

Percolation Process ◽

Ionic Size ◽

Superconductor Insulator Transition

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Ionic size effects

10.1088/978-0-7503-2276-8ch13 ◽

2021 ◽

Author(s):

Dimiter N Petsev ◽

Frank van Swol ◽

Laura J D Frink

Keyword(s):

Size Effects ◽

Ionic Size

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Cationic Self-Diffusion in Molten (Tl-Na)NO3 and (Tl-Rb)NO3 Systems

Zeitschrift für Naturforschung A ◽

10.1515/zna-1977-1215 ◽

1977 ◽

Vol 32 (12) ◽

pp. 1435-1437 ◽

Cited By ~ 1

Author(s):

S. Zuca ◽

M. Constantinescu

Keyword(s):

Diffusion Coefficients ◽

Size Effects ◽

Self Diffusion ◽

Ionic Size

Abstract The cationic self-diffusion coefficients in molten (Tl-Na)NO3 and (Tl -Rb)NO3 systems were investigated as a function of temperature and concentration. The obtained data were examined from the viewpoint of polarization and ionic size effects.

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Classical density functional analysis of the ionic size effects on the properties of charge regulating electric double layers

Molecular Physics ◽

10.1080/00268976.2021.1937737 ◽

2021 ◽

pp. e1937737

Author(s):

D. J. Prakash ◽

L. Denoyer ◽

R. Vangara ◽

J. M. Baca ◽

F. van Swol ◽

...

Keyword(s):

Functional Analysis ◽

Size Effects ◽

Density Functional ◽

Double Layers ◽

Electric Double Layers ◽

Ionic Size

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Glycothermal synthesis of rare earth iron garnets

Journal of Materials Research ◽

10.1557/jmr.1998.0114 ◽

1998 ◽

Vol 13 (4) ◽

pp. 856-860 ◽

Cited By ~ 15

Author(s):

Masashi Inoue ◽

Toshihiro Nishikawa ◽

Tomoyuki Inui

Keyword(s):

Rare Earth ◽

Yttrium Aluminum Garnet ◽

Hydrothermal Reaction ◽

The Other ◽

Spontaneous Nucleation ◽

Iron Garnets ◽

Yttrium Aluminum ◽

Ionic Size ◽

Two Phases ◽

Iron Garnet

The reactions of rare earth (RE) acetates with iron acetylacetonate in 1,4-butanediol at 300 °C (glycothermal reaction) yielded two novel phases depending on the ionic size of the RE element: one was obtained for Er-Lu and the other for Tb and Dy. The former phase was hexagonal REFeO3, while the latter phase has not been identified. The reaction of Y or Ho acetate yielded the mixture of these two phases. When the reactions were carried out in the presence of seed crystals of yttrium aluminum garnet (Y3Al5O12), these phases were not formed but RE iron garnet (RE3Fe5O12) grew on the seed, which suggests that spontaneous nucleation of RE iron garnet does not occur, but crystal growth proceeds easily under the glycothermal conditions. Hydrothermal reaction of the same starting materials yielded a mixture of Fe2O3 and an amorphous RE phase.

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