Investigation on thermo-physical and mechanical properties of Dy3(Ta1-xNbx)O7 ceramics with order-disorder transition

Wu, Fushuo; Wu, Peng; Zong, Ruofei; Feng, Jing

doi:10.1016/j.ceramint.2019.04.207

Cited by 21 publications

(14 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hardness of a material is a complex physical quantity, which is related not only to the atomic radius and electronegativity in the material but also to the bonding strength of the chemical bond. For oxide ceramic materials, the bonding strength is considered to be the main factor determining hardness . Young's modulus is an important physical parameter for characterizing bonding strength, so it can be used to explain the variation of hardness.…”

Section: Resultsmentioning

confidence: 99%

“…According to the Debye model, the thermal diffusivity ( α ) can be expressed by the following formula:

α = \frac{1}{3} v_{normalm} l,

where v m is the average sound velocity. Since the speed of sound is non‐temperature dependent, thermal diffusion can be approximated described as follows:

\frac{1}{α} \sim \frac{1}{l (ω, T)} \sim (\frac{b C n^{1 false/ 3}}{θ_{normalD}}) T + (D - \frac{1}{2} C) .

…”

Section: Resultsmentioning

confidence: 99%

“…For oxide ceramic materials, the bonding strength is considered to be the main factor determining hardness. 38 Young's modulus is an important physical parameter for characterizing bonding strength, so it can be used to explain the variation of hardness. As shown in Figure 5H, the hardness and Young's modulus of RENbO 4 ceramics show the linear relationship, and the hardness value increases with the increase of Young's modulus.…”

Section: Young's Modulus and Hardnessmentioning

confidence: 99%

“…where v m is the average sound velocity. Since the speed of sound is non-temperature dependent, thermal diffusion can be approximated described as follows 38 :…”

Section: Thermo-physical Propertiesmentioning

confidence: 99%

See 3 more Smart Citations

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Zhou

et al. 2019

J Am Ceram Soc

Self Cite

View full text Add to dashboard Cite

In this work, RENbO4 (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics with low density, low Young's modulus, low thermal conductivity, and high thermal expansion have been systematically investigated, the excellent thermo‐mechanical properties indicate that RENbO4 ceramics possess the potential as the new generation of thermal barrier coatings (TBCs) materials. X‐ray diffraction and Raman spectroscopy phase structure identification reveal that all dense bulk specimens obtained by high‐temperature solid‐state reaction belonged to the monoclinic (m) phase with C12/c1 space group. The ferroelastic domains are detected in the specimens, revealing the ferroelastic transformation between tetragonal (t) and monoclinic (m) phases of RENbO4 ceramics. The Young's modulus and hardness of the RENbO4 ceramics measured by the NanoBlitz 3D nanoindentation method are discussed in details, and the lower Young's modulus (60‐170 GPa) and higher hardness (the maximum value reaches 11.48 GPa) indicating that higher resistance of RENbO4 ceramics to failure and damage. Lower thermal conductivity (1.42‐2.21 W [m k]−1 at 500°C‐900°C) and lower density (5.330‐7.400 g/cm3) than other typical TBCs materials give RENbO4 ceramics the unique advantage of being new TBCs materials. Meanwhile, the thermal expansion coefficients of RENbO4 ceramics reach 9.8‐11.6 × 10−6 k−1 and are comparable or higher than other typical TBCs materials. According to the first‐order derivative of the thermal expansion rate, the temperature of the ferroelastic transformation of RENbO4 ceramics can be observed.

show abstract

Section: Resultsmentioning

confidence: 99%

“…According to the Debye model, the thermal diffusivity ( α ) can be expressed by the following formula:

α = \frac{1}{3} v_{normalm} l,

where v m is the average sound velocity. Since the speed of sound is non‐temperature dependent, thermal diffusion can be approximated described as follows:

\frac{1}{α} \sim \frac{1}{l (ω, T)} \sim (\frac{b C n^{1 false/ 3}}{θ_{normalD}}) T + (D - \frac{1}{2} C) .

…”

Section: Resultsmentioning

confidence: 99%

Section: Young's Modulus and Hardnessmentioning

confidence: 99%

“…where v m is the average sound velocity. Since the speed of sound is non-temperature dependent, thermal diffusion can be approximated described as follows 38 :…”

Section: Thermo-physical Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Zhou

et al. 2019

J Am Ceram Soc

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Birch-Murnaghan equation of state (EOS) with four parameters was employed for the polymorphous YTaO 4 to fit A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

Section: Computational Methods and Detailsmentioning

confidence: 99%

First‐principles study of thermophysical properties of polymorphous YTaO₄ ceramics

Zhou

Gan

et al. 2021

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

Yttrium tantalate ceramics with ferroelasticity are potential candidates for thermal barrier coating (TBC) ceramics. During the phase transition process, there are three main phases with monoclinic (I2/a), monoclinic-prime (P2/a), and tetragonal structures (I 41 /a), and a comprehensive understanding of their thermophysical properties is required. In this study, the thermal and mechanical properties of polymorphous yttrium tantalate (YTaO 4 ) ceramics are systematically investigated under finite temperature by performing first-principles calculations combined with quasi-harmonic approximation. The first-principle study results show that the volume change from M' to T phase is 12.85 Å 3 to 12.95 Å 3 per atom, whereas the T to M is 12.95 Å 3 to 12.84 Å 3 per atom, and the change is less than 1%, showing that this process produces almost no volume change.However, the thermal expansion coefficients (TECs) and Young's modulus vary greatly, the TECs value of M YTaO 4 is about 11.13 × 10 −6 K −1 , which is smaller than T YTaO 4 as the value 12.01 × 10 −6 K −1 , and the Young's modulus values of M, M', and T phases are 140. 34, 156.68, and 123.29 GPa, respectively. Lastly, the calculated O-Ta bond is stronger than the O-O and O-Y bonds according to the mean bond population and average bond length, resulting in a higher modulus. This work will not only expand the internal mechanism of the thermophysical properties of YTaO 4 , but also provides support for the design and application of TBC systems.

show abstract

Thermophysical properties investigations and optimizations of RETaO4 ceramics for thermal barrier coatings applications

Feng¹,

Wang²,

Yang³

et al. 2023

Thermal Barrier Coatings

View full text Add to dashboard Cite

Investigation on thermo-physical and mechanical properties of Dy3(Ta1-xNbx)O7 ceramics with order-disorder transition

Cited by 21 publications

References 27 publications

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

First‐principles study of thermophysical properties of polymorphous YTaO₄ ceramics

Thermophysical properties investigations and optimizations of RETaO4 ceramics for thermal barrier coatings applications

Contact Info

Product

Resources

About

Investigation on thermo-physical and mechanical properties of Dy3(Ta1-xNbx)O7 ceramics with order-disorder transition

Cited by 21 publications

References 27 publications

The thermo‐mechanical properties and ferroelastic phase transition of RENbO4(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO4(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

First‐principles study of thermophysical properties of polymorphous YTaO4 ceramics

Thermophysical properties investigations and optimizations of RETaO4 ceramics for thermal barrier coatings applications

Contact Info

Product

Resources

About

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

First‐principles study of thermophysical properties of polymorphous YTaO₄ ceramics