Topic
Thermal expansion
About: Thermal expansion is a research topic. Over the lifetime, 21040 publications have been published within this topic receiving 349407 citations. The topic is also known as: heat expansion.
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TL;DR: The structure of the atmospheric pressure form of SrIrO3 is shown to be a monoclinic distortion of the hexagonal BaTiO3 structure (a = 5.604 A, b = 9.618 A, c = 14.17 A, β = 93.26°) as mentioned in this paper.
162 citations
TL;DR: In this article, the structure, thermal expansion and ionic conductivity of solid electrolytes based on samarium doped cerium oxide, Ce1−xSmxO2−x2 (x = 0−0.30), prepared by the sol-gel method were systematically investigated in a wide range of temperature of 200-650 °C.
162 citations
TL;DR: In this paper, the coefficients of thermal expansion of rutile and anatase were determined from 30° to 650°C and from 28° to 712°C, respectively, using a high-temperature powder camera.
Abstract: Lattice parameters of rutile and anatase were determined from 30° to 650°C and from 28° to 712°C, respectively, using a high-temperature powder camera These data were used to evaluate the coefficients of thermal expansion of rutile and anatase The temperature dependence of the coefficients, α11 and α1, parallel and perpendicular to the principal axis, respectively, are represented by the equations:
Rutile:
Anatase:
The relative magnitudes of the coefficients of thermal expansion of these polymorphs are explained in terms of the interionic distances
162 citations
Journal Article•
TL;DR: In nonoxidizing high-temperature environments, carbon-carbon composites retain room temperature properties to more than 2225 C; in oxidizing environments, the variety of coatings thus far developed limits maximum operating temperatures to about 1600 C.
Abstract: In nonoxidizing high-temperature environments, carbon-carbon composites retain room temperature properties to more than 2225 C; in oxidizing environments, the variety of coatings thus far developed limits maximum operating temperatures to about 1600 C. The high thermal conductivity and low thermal expansion of these composites renders them ideal for applications encountering thermal shocks. In addition, the variety of fibers, weave patterns, and layup procedures that can be used for the composites allows mechanical properties to be carefully tailored over a wide range to fit the application in question.
161 citations
TL;DR: The thermal expansion coefficients of transition-metal-free sinter mullite and fused mullite are measured between 25° and 900°C by high-temperature Guinier X-ray diffraction techniques as discussed by the authors.
Abstract: The thermal expansion coefficients of transition-metal-free sinter mullite and fused mullite, and of chromium-doped (11.5 wt% Cr2O3) and iron-doped (10.3 wt% Fe2O3) sinter mullites are measured between 25° and 900°C by high-temperature Guinier X-ray diffraction techniques. Most mullites display low and nonlinear thermal expansions below, but larger and linear expansion above, ∼300°C. Although the temperature-induced c-axis expansion coefficients seem to be less dependent on the compositional state x and on transition-metal incorporation of the Al4+2xSi2–2xO10–x mullite-type phases (α(c) = 5.6 × 10−6/°C to 6.1 × 10−6/°C), thermal a- and b-axis expansion coefficients change more significantly (α(a) = 3.1 × 10−6/°C to 4.1 × 10−6/°C and α(b) = 5.6 × 10−6/°C to 7.0 × 10−6/°C, where the values were calculated between 300° and 900°C). The larger temperature-induced b than c and a expansions probably are caused by intense lengthening of the relatively long and elastic octahedral Al(1)–O(D) bonds in mullite, which form at an angle of about 30° with b, but of about 60° with a. With increasing x value of the transition-metal-free mullites, the volume thermal expansion decreases, while the anisotropy of thermal expansion is reduced simultaneously. We believe that the variation of the thermal expansion coefficients is controlled by the Al* occupancy and by the number of O(C) vacancies in the mullite structure, and also by the disordering distribution of both structural elements. Transition-metal incorporation into mullite has no distinct influence on thermal expansion anisotropy, but does reduce thermal volume expansion. A prestressing of the crystal structure by substitution of Al3+ by the larger Fe3+ and Cr3+ ions may be the main reason for the latter effect.
161 citations