2002
DOI: 10.1111/j.1151-2916.2002.tb00396.x
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Complete Elastic Tensor for Mullite (∼2.5Al2O3·SiO2) to High Temperatures Measured from Textured Fibers

Abstract: Directionally solidified mullite fibers have been grown by the laser‐heated, float‐zone method from starting materials with a nominal composition of 3Al2O3·2SiO2. The fibers used in this study have large single‐crystal regions with composition 2.5Al2O3·SiO2 and (001) fiber axis orientation. The complete elastic tensor of these samples has been determined by Brillouin spectroscopy at room temperature and elevated temperatures up to 1200°C. Isotropic moduli (bulk, shear, and Young's) have been calculated using t… Show more

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Cited by 26 publications
(24 citation statements)
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“…In directions perpendicular to c-axis only minor differences are observed in the elastic properties of both crystal species. [37][38][39] There is also a similarity with the elastic constants of the mullite-type phase Bi 2 Ga 4 O 9 , the elastic properties of which are essentially controlled by the strong octahedral chains. 55 According to Schreuer et al 39 the elastic constants of 2/1-mullite decrease almost linearly between room temperature and 1400 • C. The thermoelastic constants T ij = d log c ij /dT are within the typical range of many silicates.…”
Section: Elastic Propertiesmentioning
confidence: 83%
“…In directions perpendicular to c-axis only minor differences are observed in the elastic properties of both crystal species. [37][38][39] There is also a similarity with the elastic constants of the mullite-type phase Bi 2 Ga 4 O 9 , the elastic properties of which are essentially controlled by the strong octahedral chains. 55 According to Schreuer et al 39 the elastic constants of 2/1-mullite decrease almost linearly between room temperature and 1400 • C. The thermoelastic constants T ij = d log c ij /dT are within the typical range of many silicates.…”
Section: Elastic Propertiesmentioning
confidence: 83%
“…The algorithm of the procedure along with the standard state properties of the chemical components at liquid state are described in full detail in . Thermodynamic properties of the other solid phases nucleating in the MAS system were taken from the database of Berman (1988), while compressibility and thermal expansion data were taken from Saxena et al (1993), except for mullite (Schneider and Eberhard 1990;Palko et al 2002), cordierite (Toohill et al 1999;Haussühl et al 2011), periclase (Belmonte 2013, and corundum (Belmonte et al 2013). The Gibbs free energy values of the solid phases and the liquid have been calculated at each pressure conditions on a regular grid of temperature-composition (T-X) points in the range T = 1273 -3273 K, then minimized through the convexhull analysis of equipotential surfaces and interpolation of sample points by lifted Delaunay triangulation (Natali et al 2010; see also Supplementary Materials in Ottonello et al 2013).…”
Section: Methodsmentioning
confidence: 99%
“…Conventional high-temperature Brillouin scattering, which employs resistance heaters, can be routinely performed to temperatures of about 1500 K. 2,12,22,34 There are a few examples of Brillouin measurements performed to higher temperatures. 3,17 The highest temperature measurements performed by Brillouin scattering with resistive heating thus far are those by Vo-Thanh et al 15 who measured the product of the compressional acoustic velocity (V P ) and refractive index of silicate melts up to 2350 K. In theory it is possible to make resistance furnaces which will be able to achieve higher temperatures, but there are a number of limitations that make these cells impractical for Brillouin measurements.…”
Section: Ir Laser Heated Measurementsmentioning
confidence: 99%
“…The high-temperature elastic moduli were measured on fibers of mullite (∼2.5Al 2 O 3 ·SiO 2 ), a common ceramic material, to 1475 K. 1,34 Even though the samples consisted of highly-textured polycrystalline fibers, 35 with crystallites having different rotation about their c axis by up to 5 • , it was possible to extract all nine single crystal elastic constants (orthorhombic symmetry). That study 34 revealed substantial differences between bulk elastic properties calculated from "single crystal" measurements and the properties reported in the literature for polycrystalline-sintered mullite.…”
Section: Polycrystalline Aggregatesmentioning
confidence: 99%