Raman spectroscopy and lattice dynamical calculations of Sc<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>single crystals

Todorov, Nikolay P.; Abrashev, M. V.; Marinova, Vera; Kadiyski, Milen; Dimowa, L.; Faulques, Eric

doi:10.1103/physrevb.87.104301

Cited by 33 publications

(23 citation statements)

References 25 publications

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“…Up to now, it has been reported only for the most-intense peak at 339 cm À1 . 25 The symmetry of all corresponding peaks also can be easily found, because in the case of Sc 2 O 3 it is unambiguously determined 12 (given in Fig. 3).…”

Section: A General Dependenciesmentioning

confidence: 86%

“…Although there are 22 Ramanactive modes, 4A g þ 4E g þ 14F g , the number of the experimentally observed peaks in the Raman spectra is smaller. 11,12,15 The Raman spectra of the studied samples with single (or dominating) C-type phase are displayed in Fig. 2 where, due to the good signal-to-noise ratio, even the weak peaks can be unambiguously detected.…”

Section: A General Dependenciesmentioning

confidence: 99%

“…The crystal structure of this phase belongs to the bixbyite-type [of the mineral (Mn,Fe) 2 O 3 ]. It can be regarded as an oxygen-deficient superstructure of the simpler CeO 2 (with CaF 2 -type crystal structure) if each fourth oxygen atom from the oxygen chains, parallel to all h100i crystal directions, is removed 11,12 (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…The most informative papers we found, in order of the increasing ionic radius of the rare earth, are for Sc-Refs. 12 11,12,15,22,26,27,31 only in few of them 11,12,27 polarized Raman spectra are shown. In some works, the symmetry of the phonon modes, giving rise to the observed peaks in the Raman spectra of Sc 2 3 11,15,27 this assignment is supported by the published experimental data.…”

Section: Introductionmentioning

confidence: 99%

“…Using this dependence and the information concerning the symmetry of the peaks, determined by Sc 2 O 3 single crystal measurements, 12 it is easy to determine the symmetry of the corresponding peaks for the rest of the oxides. We also show that in the six modes with lowest frequency mainly R ions take part in the vibrations.…”

Section: Introductionmentioning

confidence: 99%

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Raman spectra of R2O3 (R—rare earth) sesquioxides with C-type bixbyite crystal structure: A comparative study

Abrashev

Todorov

Geshev

2014

Journal of Applied Physics

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120

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Dielectric and optical properties of epitaxial rare-earth scandate films and their crystallization behavior Appl. Phys. Lett. 88, 262906 (2006) Raman spectra of R 2 O 3 (R-Sc, Er, Y, Ho, Gd, Eu, and Sm) powders with C-type bixbyite crystal structure are measured. With the help of these data and ones, previously published for other oxides from the same structural family, general dependencies of the frequencies of the Raman peaks on the cubic crystal unit cell parameter are constructed. Using these dependencies and knowing the symmetry of the peaks for one of the oxides, determined from previous single-crystal measurements, it is possible to find out the symmetry of the peaks from the spectra of all compounds. It was found that the frequency of the six lowest frequency peaks scales with the square root of the mass of the rare earth showing that mainly R ions take part in these vibrations. These results agree with performed here lattice dynamical calculations. The anomalous softening of the frequency of some peaks in the spectra of Eu 2 O 3 is discussed. V C 2014 AIP Publishing LLC.

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Section: A General Dependenciesmentioning

confidence: 86%

Section: A General Dependenciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Raman spectra of R2O3 (R—rare earth) sesquioxides with C-type bixbyite crystal structure: A comparative study

Abrashev

Todorov

Geshev

2014

Journal of Applied Physics

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120

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Structure and Luminescence Properties of Ho:(Y_1−xSc_x)₂O₃ Ceramics

Bai

Zhao

et al. 2022

Adv Eng Mater

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Experimental Section2.1. Fabrication of 0.5 at% Ho:(Y 1Àx Sc x ) 2 O 3 Ceramics Commercial Y 2 O 3 (99.995%, Jiahua Advanced Material Resources Co., Ltd, Jiangyin, China), Sc 2 O 3 , and Ho 2 O 3 (both 99.99%, Alfa Aesar (Tianjin) Chemical Co. Ltd, Tianjin, China) powders as raw materials were weighed according to the formula [Ho 0.005 (Y 1Àx Sc x ) 0.995 ] 2 O 3 (x ¼ 0, 0.3, 0.5, 0.7, 1.0) and simply denoted as 0.5 at% Ho:(Y 1Àx Sc x ) 2 O 3 . In addition,

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Room‐Temperature Synthesis of a Compositionally Complex Rare‐Earth Carbonate Hydroxide and its Conversion into a Bixbyite‐Type High‐Entropy Sesquioxide

Bernauer,

Trapp,

Wiehl

et al. 2023

Eur J Inorg Chem

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In the present work, the solvent‐deficient synthesis of the high‐entropy rare‐earth carbonate hydroxide RE(CO3)(OH) (RE=La, Ce, Pr, Nd, Sm, and Gd) and its thermal conversion into bixbyite‐type sesquioxide RE2O3 are reported for the first time. The high‐entropy rare earth carbonate hydroxide was prepared via mechanochemical reaction of the corresponding metal nitrate hydrates with ammonium hydrogen carbonate followed by the removal of the NH4NO3 by‐product. Calcination of the carbonate hydroxide precursor in ambient atmosphere at temperatures in the range from 500 to 1000 °C led to the high‐entropy rare earth sesquioxide which exhibited a bixbyite‐type structure ( ) independent of the calcination temperature. Transmission electron microscopy (TEM) investigation revealed the homogeneous distribution of all six rare earth cations in the high‐entropy sesquioxide lattice, however, with some compositional variation between individual grains. The bixbyite‐type structure may be considered as the result of heavy doping of the fluorite‐type CeO2 lattice with the other rare earth cations, which leads to a high concentration of oxygen vacancies, as revealed by electron diffraction and Raman spectroscopy data. The solvent‐deficient synthesis method used in the present study is considered as a valuable, straightforward and easily up‐scalable method to synthesize compositionally complex oxide ceramics.

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Raman spectroscopy and lattice dynamical calculations of Sc2O3single crystals

Cited by 33 publications

References 25 publications

Raman spectra of R2O3 (R—rare earth) sesquioxides with C-type bixbyite crystal structure: A comparative study

Raman spectra of R2O3 (R—rare earth) sesquioxides with C-type bixbyite crystal structure: A comparative study

Structure and Luminescence Properties of Ho:(Y_1−xSc_x)₂O₃ Ceramics

Room‐Temperature Synthesis of a Compositionally Complex Rare‐Earth Carbonate Hydroxide and its Conversion into a Bixbyite‐Type High‐Entropy Sesquioxide

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Raman spectroscopy and lattice dynamical calculations of Sc2O3single crystals

Cited by 33 publications

References 25 publications

Raman spectra of R2O3 (R—rare earth) sesquioxides with C-type bixbyite crystal structure: A comparative study

Raman spectra of R2O3 (R—rare earth) sesquioxides with C-type bixbyite crystal structure: A comparative study

Structure and Luminescence Properties of Ho:(Y1−xScx)2O3 Ceramics

Room‐Temperature Synthesis of a Compositionally Complex Rare‐Earth Carbonate Hydroxide and its Conversion into a Bixbyite‐Type High‐Entropy Sesquioxide

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Structure and Luminescence Properties of Ho:(Y_1−xSc_x)₂O₃ Ceramics