The low-temperature anisotropic thermal expansion of calcium tungstate

Yates, B.; Bailey, A. C.

doi:10.1007/bf00628442

Cited by 18 publications

(8 citation statements)

References 29 publications

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“…The density of 6.120 x 103 kg m-3 at 300 K for Caw04 was calculated from the lattice spacing given in the ASTM Powder Diffraction file, and the molecular weight of 287.95 was calculated from atomic weights in the Handbook of Chemistry andphysics (1972). The corrections for the change in length and density were made by using the thermal expansion data of Yates and Bailey (1971). Of the eleven measured velocities for waves propagated in CaW04, the velocity of the pure transverse modes propagated in the directions [loo], [OOl], [llO] and [lYO] should be identical.…”

Section: Ultrasonic Velocity Measurements and Resultsmentioning

confidence: 99%

“…Thus interest has recently turned to the lower-symmetry and more complex dielectric solids. An investigation of the elastic constants of calcium tungstate, CaW04, is most appropriate since the heat capacity has been measured by Lyon and Westrum (1968), and Yates and Bailey (1971) have measured the thermal expansion. The elastic constants of Caw04 have recently been measured by Farley and Saunders (1972) but the present study was commenced prior to the publication of their measurements.…”

Section: Introductionmentioning

confidence: 99%

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The elastic constants of calcium tungstate, 4$middot$2-300 K

Gluyas

Hughes

James

1973

J. Phys. D: Appl. Phys.

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The temperature dependences from 4·2 to 300 K of the seven adiabatic elastic constants of CaWO4 have been determined by measurements of ultrasound wave velocities using the `sing-around' and pulse superposition methods. The adiabatic elastic constants have been calculated from the measured ultrasound wave velocities by a perturbation method using just seven of the eleven measured velocities and by an iterative method using all the measured velocities; agreement has been found between the two sets of values. The complementary data on the thermal expansion and heat capacity at constant pressure of CaWO4 have been used with the present results to find the isothermal elastic constants, the heat capacity at constant volume, the Grüneisen parameters, and the Debye characteristic temperature at 0 K. The Debye characteristic temperature has been found from the heat capacity at constant volume from 10 to 300 K after subtraction of the Einstein heat capacity terms from the total heat capacity.

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Section: Ultrasonic Velocity Measurements and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The elastic constants of calcium tungstate, 4$middot$2-300 K

Gluyas

Hughes

James

1973

J. Phys. D: Appl. Phys.

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“…At 270 K, though, these values increased to 15.3 x 10 -6 /K and 9.2 x 10 -6 /K. 106 Many studies have also focused on the high-pressure structure of CaWO 4 . While no phase changes occur in the material with increase in temperature, pressure-induced phase changes have been observed.…”

Section: Cawo 4 Backgroundmentioning

confidence: 99%

In-situ High Temperature Phase Transformations in Ceramics

Sarin¹,

Kriven²

2009

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This project was aimed at developing the foundation, based on existing knowledge of various high temperature material properties, to explore new ceramic materials with interesting phase transformation properties. The systems focused on were one and two component oxide ceramic systems with the potential for application in the aerospace industry, namely, high temperature, chemically stable, oxide ceramics. A thorough evaluation of literature was conducted to identify three to five key ceramic oxide materials that may have promising high temperature phase transformation behavior. Eventually, based on literature and PIs extensive knowledge on phase transformations in oxide ceramics, four candidate ceramic oxide materials were identified for in-depth investigation of their high temperature and phase transformation properties by state-of-the-art, in-situ high temperature experimentation which included DSC/TGA, dilatometry and high temperature X-ray diffraction using synchrotron radiation. These included (a) Y 2 SiO 5 , (b) CaWO 4 , (c) CePO 4 and (d) YTaO 4 .

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“…(4) to the experimental results 16) in the temperature range of 30-270 K. The optimum values of constants A, B and T 1 are 1.22 × 10 −3 , 0.234 K and 120 K (shown by the full curve in Fig. 2), respectively.…”

mentioning

confidence: 92%

“…The experimental values16) are shown by solid circles, and the calculated ones using eq. (4) by the solid line.…”

mentioning

confidence: 99%

Temperature Dependence of the Ag+Bg-Mode of Raman Shift for CaWO₄Crystal

1998

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The first-order Raman frequency shifts of the A g(2) + B g(2) mode in a CaWO 4 crystal were measured in the temperature range of 77 ∼ 771 K. The frequency shift for this mode changes very slowly with increasing temperature. The temperature dependence of the frequency shift of the A g(2) + B g(2) mode was analyzed using the lattice dynamical perturbative treatment. We found that the quartic anharmonic term of the first-order perturbation, as well as the cubic term of the second-order one, and thermal expansion contribute to the temperature dependence of the frequency shift of the A g(2) + B g(2) mode in a CaWO 4 crystal.KEYWORDS: Raman frequency shift, cubic and quartic anharmonic term, thermal expansion, lattice dynamical perturbative treatment * Present address:

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The low-temperature anisotropic thermal expansion of calcium tungstate

Cited by 18 publications

References 29 publications

The elastic constants of calcium tungstate, 4$middot$2-300 K

The elastic constants of calcium tungstate, 4$middot$2-300 K

In-situ High Temperature Phase Transformations in Ceramics

Temperature Dependence of the Ag+Bg-Mode of Raman Shift for CaWO₄Crystal

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The low-temperature anisotropic thermal expansion of calcium tungstate

Cited by 18 publications

References 29 publications

The elastic constants of calcium tungstate, 4$middot$2-300 K

The elastic constants of calcium tungstate, 4$middot$2-300 K

In-situ High Temperature Phase Transformations in Ceramics

Temperature Dependence of the Ag+Bg-Mode of Raman Shift for CaWO4Crystal

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Product

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Temperature Dependence of the Ag+Bg-Mode of Raman Shift for CaWO₄Crystal