Kinetics of terbium oxide film growth from Tb(dpm)3 vapor

Баковец, В. В.; Belaya, S. V.; Lobzareva, M. N.; Максимовский, Е. А.

doi:10.1134/s0020168514060016

Cited by 5 publications

(7 citation statements)

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“…In particular, terbium sesquioxide (Tb 2 O 3 ) has attracted considerable attention in the past few years as a high-k material 1 − 3 and also as an active material for optical insulators and high-performance optoelectronic devices. 4 − 6 …”

Section: Introductionmentioning

confidence: 99%

Structural and Lattice-Dynamical Properties of Tb₂O₃ under Compression: A Comparative Study with Rare Earth and Related Sesquioxides

et al. 2020

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We report a joint experimental and theoretical investigation of the high pressure structural and vibrational properties of terbium sesquioxide (Tb 2 O 3 ). Powder X-ray diffraction and Raman scattering measurements show that cubic Ia 3̅ (C-type) Tb 2 O 3 undergoes two phase transitions up to 25 GPa. We observe a first irreversible reconstructive transition to the monoclinic C 2/ m (B-type) phase at ∼7 GPa and a subsequent reversible displacive transition from the monoclinic to the trigonal P 3̅ m 1 (A-type) phase at ∼1 2 GPa. Thus, Tb 2 O 3 is found to follow the well-known C → B → A phase transition sequence found in other cubic rare earth sesquioxides with cations of larger atomic mass than Tb. Our ab initio theoretical calculations predict phase transition pressures and bulk moduli for the three phases in rather good agreement with experimental results. Moreover, Raman-active modes of the three phases have been monitored as a function of pressure, while lattice-dynamics calculations have allowed us to confirm the assignment of the experimental phonon modes in the C- and A-type phases as well as to make a tentative assignment of the symmetry of most vibrational modes in the B-type phase. Finally, we extract the bulk moduli and the Raman-active mode frequencies together with their pressure coefficients for the three phases of Tb 2 O 3 . These results are thoroughly compared and discussed in relation to those reported for rare earth and other related sesquioxides as well as with new calculations for selected sesquioxides. It is concluded that the evolution of the volume and bulk modulus of all the three phases of these technologically relevant compounds exhibit a nearly linear trend with respect to the third power of the ionic radii of the cations and that the values of the bulk moduli for the three phases depend on the filling of the f orbitals.

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Section: Introductionmentioning

confidence: 99%

Structural and Lattice-Dynamical Properties of Tb₂O₃ under Compression: A Comparative Study with Rare Earth and Related Sesquioxides

et al. 2020

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“…It is only recently that the growth of cubic Tb 2 O 3 polycristalline thin films was investigated for electronic or optronic applications. [6][7][8] The increasing interest for Tb 2 O 3 thin films is such that the availability of high quality rare earth sesquioxide substrates would certainly constitute an important progress. On the other hand, as soon as it became clear that cubic Tb 2 O 3 crystals could be made available, their use as Faraday rotators was patented.…”

Section: Introductionmentioning

confidence: 99%

Flux growth at 1230 °C of cubic Tb₂O₃single crystals and characterization of their optical and magnetic properties

et al. 2015

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In this work, we present the first crystal growth of cubic Tb 2 O 3 single crystals by a controlled atmosphere flux method which uses a heavy metal free solvent working at less than half the melting temperature of this sesquioxide. Cubic millimeter-sized crystals extracted from as-grown boules are phase (powder XRD) and chemically (GDMS) pure and exhibit a Verdet constant in the visible and near-infrared spectral ranges, which is at least three times higher than that of a commercial Tb 3 Ga 5 O 12 (TGG) crystal. The 1.36 mm thick crystals display a transmission coefficient higher than 77% over the 525 nm-1.38 μm spectral range. The absorption spectrum, magnetic susceptibility and specific heat measurements on the single crystals confirm the absence of detectable Tb 4+ cations and other impurities.

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“…Some authors have attributed the wavenumber reduction of the high-wavenumber optical modes of Eu 2 O 3 and Yb 2 O 3 to the larger deformation of the electron shells of Eu and Yb ions than those of other lanthanides. This has been associated to the presence of shallow f -states [10] ; however, it is clear that such effect cannot be linked to the half-filled 4f 7 configuration of the 2+ oxidation state, which is more stable than the 4f 6 [8] This observation, together with the results of the DFT calculations (Figure 4), suggests that the anomalous behavior of the high-wavenumber Raman modes of Eu 2 O 3 is not related to its specific electronic configuration. Thus, the presence of O vacancies in the crystal structure of Eu 2 O 3 could be responsible for the wavenumber reduction exhibited by some high-wavenumber Raman peaks of this compound.…”

Section: Resultsmentioning

confidence: 99%

“…These compounds may enable a wide range of technological advances including light emitters, catalysts, or high‐dielectric constant (high‐k) gates. Among this family of compounds, terbium oxide (Tb 2 O 3 ) has attracted considerable attention in the last few years as a high‐k material and also as an active material for high‐performance optoelectronic devices . Recently, it has been shown that millimeter‐sized C‐type Tb 2 O 3 pure single crystals can be grown with a controlled atmosphere flux method, using melting temperatures much lower than those of pure Tb 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

“…also as an active material for high-performance optoelectronic devices. [4][5][6] Recently, it has been shown that millimeter-sized C-type Tb 2 O 3 pure single crystals can be grown with a controlled atmosphere flux method, using melting temperatures much lower than those of pure Tb 2 O 3 . [7] The high-quality cubic Tb 2 O 3 crystals thus obtained are highly promising for applications in optics and photonics.…”

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Lattice dynamics study of cubic Tb₂O₃

Ibáñez

Blázquez

Hernández

et al. 2018

J Raman Spectroscopy

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We report a joint experimental and theoretical study of the lattice dynamics of cubic Tb2O3. Up to 16 optical Raman‐active modes have been observed with polarized and unpolarized Raman scattering measurements on a high‐quality Tb2O3 single crystal. The measured wavenumbers have been compared with those of other rare‐earth (RE) and related sesquioxides with cubic (C‐type or bixbyite) structure. First‐principles calculations have allowed us to assign the symmetry of the experimentally observed Raman‐active modes. Additional lattice‐dynamical calculations on the related cubic RE sesquioxides Dy2O3, Gd2O3, Eu2O3, and Sm2O3 indicate that the phonon wavenumbers of the Raman‐active modes in these compounds are monotonically reduced with increasing the lattice parameter along the Dy2O3‐Tb2O3‐Gd2O3‐Eu2O3‐Sm2O3 series, thus prompting for a revision of the experimental Raman spectra of some of these compounds (mainly Eu2O3 but also Gd2O3).

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Kinetics of terbium oxide film growth from Tb(dpm)3 vapor

Cited by 5 publications

References 2 publications

Structural and Lattice-Dynamical Properties of Tb₂O₃ under Compression: A Comparative Study with Rare Earth and Related Sesquioxides

Structural and Lattice-Dynamical Properties of Tb₂O₃ under Compression: A Comparative Study with Rare Earth and Related Sesquioxides

Flux growth at 1230 °C of cubic Tb₂O₃single crystals and characterization of their optical and magnetic properties

Lattice dynamics study of cubic Tb₂O₃

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Kinetics of terbium oxide film growth from Tb(dpm)3 vapor

Cited by 5 publications

References 2 publications

Structural and Lattice-Dynamical Properties of Tb2O3 under Compression: A Comparative Study with Rare Earth and Related Sesquioxides

Structural and Lattice-Dynamical Properties of Tb2O3 under Compression: A Comparative Study with Rare Earth and Related Sesquioxides

Flux growth at 1230 °C of cubic Tb2O3single crystals and characterization of their optical and magnetic properties

Lattice dynamics study of cubic Tb2O3

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Product

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Structural and Lattice-Dynamical Properties of Tb₂O₃ under Compression: A Comparative Study with Rare Earth and Related Sesquioxides

Structural and Lattice-Dynamical Properties of Tb₂O₃ under Compression: A Comparative Study with Rare Earth and Related Sesquioxides

Flux growth at 1230 °C of cubic Tb₂O₃single crystals and characterization of their optical and magnetic properties

Lattice dynamics study of cubic Tb₂O₃