Axial Thermal Expansion of HfO<sub>2</sub>

Stacy, Denzil W.; Johnstone, J.K.; Wilder, D. R.

doi:10.1111/j.1151-2916.1972.tb11347.x

Cited by 44 publications

(12 citation statements)

References 2 publications

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“…According to the fitted function for the two end members T 0 are 1367 and 2052 K, respectively. The uncertainties introduced by linear fit are estimated to be 5 K. The value of 1367 K for ZrO 2 is only 20 K lower than the value of 1387 K suggested in the work of Yashima et al 3 by extrapolating the T 0 data of the ZrO 2 −YO 1.5 system, and agrees well with most of the literature data obtained by DTA or dilatometry, while the value of 2052 K for HfO 2 is also consistent with the experimental data of 5,18,19,23 within the limits of uncertainty.…”

Section: Resultssupporting

confidence: 89%

“…Stacy et al 23 determined the variation of the lattice parameters of the monoclinic and tetragonal phase by using high‐temperature XRD up to 2213 K, and derived an equilibrium temperature at 2023±20 K. Coutures and Coutures 5 obtained the same value with the same route, while Aldebert et al 24 reported a value of 2038 K by measuring the lattice expansion with the neutron diffraction. All these results 5,23,24 are very close to the approximate T 0 temperature calculated from the data of Fujimori et al 18 The results 6,17,25 obtained by HTXRD are questionable, because they present higher M s temperatures than the A s temperatures, and the other results of HTXRD 11,26–28 with considerable deviation from the DTA, dilatometry, and Raman scattering results are also considered as less reliable.…”

Section: Literature Informationmentioning

confidence: 99%

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The Zirconia–Hafnia System: DTA Measurements and Thermodynamic Calculations

Wang

Zinkevich

Aldinger

2006

Journal of the American Ceramic Society

134

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The equilibrium temperature (T 0 ) at which the tetragonal and monoclinic phases of either ZrO 2 or HfO 2 coexist is generally defined by the middle temperature of A s (the onset transformation temperature on heating) and M s (the onset transformation temperature on cooling). It cannot be directly determined due to the athermal nature of the martensitic transformation. Practically, the determination of T 0 is important for the prediction of A s and M s in ZrO 2 or HfO 2 -based materials. In this work, the ZrO 2 -HfO 2 system was studied experimentally by differential thermal analysis (DTA) to obtain the martensitic tetragonal 3 monoclinic transformation temperatures in the temperature range of 1273-1973 K. The T 0 temperatures obtained for ZrO 2 and HfO 2 are 136775 and 205275 K, respectively. They are adopted for the assessments of the Gibbs energy parameters of these two oxides. A reasonably calculated ZrO 2 ÀHfO 2 phase diagram is presented.

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Section: Resultssupporting

confidence: 89%

Section: Literature Informationmentioning

confidence: 99%

The Zirconia–Hafnia System: DTA Measurements and Thermodynamic Calculations

Wang

Zinkevich

Aldinger

2006

Journal of the American Ceramic Society

134

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“…conducted a thorough X‐ray study of the structure of HfO 2 through the monoclinic to tetragonal transformation, to get the thermal expansion of both phases and the volume change at transformation. Unfortunately, this work too was done in a vacuum furnace . The structure of HfO 2 was again studied through the transformation in 1987 by Coutures and Coutures, but these experiments were done in air up to 1500°C, and then in a He‐2%H atmosphere to 2000°C …”

Section: Introductionmentioning

confidence: 99%

Thermal Expansion of HfO₂ and ZrO₂

et al. 2014

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The thermal expansion of a low symmetry crystal can be much more interesting than the lattice parameter expansion would suggest. Here, the complete thermal expansion tensors for monoclinic and tetragonal phases of ZrO 2 and HfO 2 have been measured in air, by high-resolution, high-temperature X-ray diffraction. These results reveal the highly anisotropic nature of thermal expansion in the monoclinic phase as well as a cooperative movement of ions and the existence of a zero thermal expansion plane.

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“…1-4 Hafnia also has applications in optical devices because of its high refractive index, high transmission coefficient, high laser damage threshold, and transparency from the infrared ͑IR͒ to the ultraviolet. 8,9 Further heating results in a cubic fluorite structure with the Hf coordinated with a cube of eight O and the O coordinated with a tetrahedron of four Hf. The monoclinic phase reversibly transforms into the tetragonal distorted fluorite structure at 1800°C, 7 with a volume decrease in about 2.7%.…”

Section: Introductionmentioning

confidence: 99%

Hafnia: Energetics of thin films and nanoparticles

Zhou

Ushakov

Wang

et al. 2010

Journal of Applied Physics

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Articles you may be interested inEffect of postdeposition annealing on the electrical properties of β-Ga2O3 thin films grown on p-Si by plasmaenhanced atomic layer deposition J. Vac. Sci. Technol. A 32, 041504 (2014); 10.1116/1.4875935 High temperature phase transformation studies in magnetite nanoparticles doped with Co2+ ion J. Appl. Phys. 112, 054320 (2012); 10.1063/1.4748318Copper coverage effect on tungsten crystallites texture development in W/Cu nanocomposite thin films Crystallization energetics of amorphous hafnia powders and thin films on platinum substrates was studied by differential scanning calorimetry and time-resolved high temperature x-ray diffraction. For initially amorphous 25 and 20 nm films from atomic layer deposition, crystallization enthalpy decreases from Ϫ38 to Ϫ32 kJ/mol, and crystallization temperature increases from 388 to 417°C as thickness decreases. Enthalpy of water vapor adsorption on the surface of monoclinic hafnia was measured for both bulk powder and nanoparticles and was found to vary from Ϫ110 to Ϫ130 kJ/mol for coverage of ϳ5 H 2 O / nm 2 . The enthalpies of monoclinic hafnia with various surface areas, prepared by crystallization and annealing of an amorphous hafnia precursor, were measured by high temperature oxide melt solution calorimetry. Under the previously used assumption that the interfacial enthalpy is 20% of the surface enthalpy, the surface enthalpy was calculated from experimental data as 2.8Ϯ 0.1 J / m 2 for the hydrated surface and 3.7Ϯ 0.1 J / m 2 for the anhydrous hafnia surface. These values are similar to those measured previously for monoclinic zirconia.⌬H ds is the drop solution enthalpy measured by high temperature oxide melt solution calorimetry. e ⌬H ds−1 is the corrected drop solution enthalpy of hydrated monoclinic hafnia. f ⌬H ds−2 is the corrected drop solution enthalpy of anhydrous monoclinic hafnia nanoparticles. 123514-4Zhou et al.

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Axial Thermal Expansion of HfO₂

Cited by 44 publications

References 2 publications

The Zirconia–Hafnia System: DTA Measurements and Thermodynamic Calculations

The Zirconia–Hafnia System: DTA Measurements and Thermodynamic Calculations

Thermal Expansion of HfO₂ and ZrO₂

Hafnia: Energetics of thin films and nanoparticles

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Axial Thermal Expansion of HfO2

Cited by 44 publications

References 2 publications

The Zirconia–Hafnia System: DTA Measurements and Thermodynamic Calculations

The Zirconia–Hafnia System: DTA Measurements and Thermodynamic Calculations

Thermal Expansion of HfO2 and ZrO2

Hafnia: Energetics of thin films and nanoparticles

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Axial Thermal Expansion of HfO₂

Thermal Expansion of HfO₂ and ZrO₂