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: In this article, single crystal magnetostriction and thermal expansion measurements are reported on Tb 27 Dy 73 Fe 2, where a spin reorientation at T = 283K causes the sudden onset of a very large magnetostrictive distortion which yields a huge anomalous contribution to the linear thermal expansion The temperature and magnitude of this contribution is field controlled.
Abstract: Single crystal magnetostriction and thermal expansion measurements are reported on Tb 27 Dy 73 Fe 2 A spin reorientation at T = 283K causes the sudden onset of a very large magnetostrictive distortion which yields a huge anomalous contribution to the linear thermal expansion The temperature and magnitude of this contribution is field controlled The expansion coefficient d(\Delta\ell/\ell)/dT can be varied from +5 to +115×10-6/°K Normal magnetostrictive behavior is observed above 283K Below this temperature a change in the easy axis from the highly magnetostrictive [111] axis to the weakly magnetostrictive [100] direction causes an anomalous field dependence Here large external fields are required to saturate the moment along [111]
91 citations
TL;DR: In this article, the authors explore trends in the elasticity, thermal expansion, and anharmonicity of AMg2Pn2 Zintl compounds with A = Mg, Ca, and Yb, and Pn = Sb and Bi.
90 citations
TL;DR: In this article, the thermal expansion behavior of thirteen plasma-sprayed MCrAlY and related coatings, plus Tribomet TM-309 and its NiCo matrix were determined, and the model equations gave calculated expansions at 525 and 825 °C within a few 0.1 mm/m of the original measurement.
Abstract: The thermal expansion behaviors of thirteen plasma-sprayed MCrAlY and related coatings, plus Tribomet TM-309 and its NiCo matrix were determined. Replicate runs to 1100 °C in argon for all coatings allowed the experimental variability and reliability of differences between coatings to be described. Wet chemical analysis of eight samples allowed multiple correlations between coating expansion and composition to be found. The model equations give calculated expansions at 525 and 825 °C within a few 0.1 mm/m of the original measurement for most coatings. The model and the original expansion data both show a NiCrAlY alloy, such as LN-33 has significantly lower expansion than current CoNiCrAlY coatings. Using low expansion NiCrAlY as a bondcoat is predicted to generate longer thermal cycle life of TBC coatings due to reduced expansion-induced interface stress with the YSZ ceramic.
90 citations
TL;DR: In this article, the coefficient of linear thermal expansion of pure polycrystalline silicon was measured with a polarization interferometer and a platinum resistance thermometer with an estimated error of less than 0.01 × 10-6 K-1.
Abstract: Measurements of the coefficient of linear thermal expansion of pure polycrystalline silicon were made with a polarization interferometer and a platinum resistance thermometer with an estimated error of less than 0.01 × 10-6 K-1.
90 citations
TL;DR: In this article, the oxygen stoichiometry of Ba 0.5 Co 0.8 Fe 0.2 O 3 δ (BSCF) was determined by isothermal thermogravimetry between 500 and 1000°C in combination with a redox titration.
90 citations