Low-temperature heat capacity of yttrium orthotantalate

Ryumin, M. A.; Sazonov, E. G.; Guskov, V. N.; Никифорова, Г. Е.; Гагарин, П. Г.; Guskov, A. V.; Гавричев, К. С.; Baldaev, L. Kh.; Mazilin, I. V.; Golushina, L. N.

doi:10.1134/s0020168516110145

Cited by 17 publications

(3 citation statements)

References 11 publications

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“…This phase was described as a tetragonal distorted form of cubic fluorite with random cation distribution [ 12 ]. However, this was not reproduced by others [ 15 , 17 ]. Whereas the M phase is considered as a potential TBC due to its low thermal conductivity [ 5 , 7 , 18 ] and ferroelastic toughening [ 4 , 6 , 8 ], M’ is of interest as X‑ray phosphor in medical diagnostics because of its shorter Ta–O bonds, which enhance the charge-transfer processes utilized in luminescence [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 59%

“…Further increase of ZrO 2 to 28 mol% and up to the maximum synthesized concentration of 44 mol% ZrO 2 results in the formation of a phase-pure t -Zr(Y,Ta)O 2 solid solution. The formation of a two-phase region of t in combination with M or M’ phase has been reported for sintered samples with ≈25 to ≈65 mol% ZrO 2 [ 10 , 12 , 15 , 16 , 17 , 18 ]. However, Van Sluytman et al [ 27 ] deposited tetragonal Y 0.2 Ta 0.2 Zr 0.6 O 2 coatings by EB-PVD consisting of a t -phase matrix with T -phase precipitates with distinguishable chemical compositions.…”

Section: Resultsmentioning

confidence: 99%

“…There has been significant progress in characterizing the Y 2 O 3 –Ta 2 O 5 –ZrO 2 system. However, studies are almost exclusively performed on sintered bulk samples or powders [ 4 , 5 , 7 , 8 , 15 , 16 , 17 , 18 , 19 , 21 , 22 , 24 , 25 , 26 ]. Physical vapor deposition (PVD) or thermal spraying are commonly employed for depositions of TBCs.…”

Section: Introductionmentioning

confidence: 99%

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Phase Formation and Thermal Stability of Reactively Sputtered YTaO4–ZrO2 Coatings

et al. 2021

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Y(1−x)/2Ta(1−x)/2ZrxO2 coatings with 0 to 44 mol% ZrO2 were synthesized by sputtering. Phase-pure M’-YTaO4 coatings were obtained at a substrate temperature of 900 °C. Alloying with ZrO2 resulted in the growth of M’ along with t-Zr(Y,Ta)O2 for ≤15 mol%, while for ≥28 mol%, ZrO2 X-ray diffraction (XRD) phase-pure metastable t was formed, which may be caused by small grain sizes and/or kinetic limitations. The former phase region transformed into M’ and M and the latter to an M’ + t and M + t phase region upon annealing to 1300 and 1650 °C, respectively. In addition to M and t, T-YTa(Zr)O4 phase fractions were observed at room temperature for ZrO2 contents ≥28 mol% after annealing to 1650 °C. T phase fractions increased during in situ heating XRD at 80 °C. At 1650 °C, a reaction with the α-Al2O3 substrate resulted in the formation of AlTaO4 and an Al-Ta-Y-O compound.

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Section: Introductionmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase Formation and Thermal Stability of Reactively Sputtered YTaO4–ZrO2 Coatings

et al. 2021

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Phase Equilibrium Investigations and Thermodynamic Study of the Y2O3-Ta2O5 System

Löffler,

Fabrichnaya

2024

J. Phase Equilib. Diffus.

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Two methods were used to investigate the Y2O3-Ta2O5 system: the equilibration method, which covered temperatures from 1573 to 1973 K, and the DTA method, which reached up to 2473 K. Phase identification was carried out using x-ray diffraction and scanning electron microscopy with energy-dispersive x-ray spectroscopy (SEM/EDX). The temperature of the eutectic reaction, L → YTa3O9 (P) + Ta2O5, was determined to be 2019 K, with the corresponding eutectic composition being 78 mol.% Ta2O5. The study presents evidence that contradicts the existence of the eutectic reaction L → YTaO4 (T) + YTa3O9 (P). Instead, it identifies a peritectic reaction L + YTaO4 (T) → YTa3O9 (P), which was observed at a temperature of around 2075 K. Additionally, the heat capacity of the YTa3O9 (P) phase was measured using differential scanning calorimetry (DSC) over the temperature range from 240 to 1300 K. The results of this experimental investigation will lead to the development of a thermodynamic database for the Y2O3-Ta2O5 system.

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Dysprosium orthotantalate ceramics: Thermal expansion and heat capacity

Гагарин

Guskov

et al. 2021

Ceramics International

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Low-temperature heat capacity of yttrium orthotantalate

Cited by 17 publications

References 11 publications

Phase Formation and Thermal Stability of Reactively Sputtered YTaO4–ZrO2 Coatings

Phase Formation and Thermal Stability of Reactively Sputtered YTaO4–ZrO2 Coatings

Phase Equilibrium Investigations and Thermodynamic Study of the Y2O3-Ta2O5 System

Dysprosium orthotantalate ceramics: Thermal expansion and heat capacity

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