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 paper, two kinds of polycrystalline zirconium nitride (ZrN) pellets were prepared by a spark plasma sintering (SPS) and measured from room temperature to 1473 and 1000 K, respectively.
75 citations
TL;DR: Increasing iron concentration in perovskite-type solid solutions was found to decrease the unit cell volume and to increase the partial ionic and electronic conductivities as well as the thermal expansion as mentioned in this paper.
75 citations
TL;DR: In this article, a nano-scaled lanthanum zirconate powder prepared by co-precipitation-calcination method was plasma-sprayed into a thick coating on an alloy substrate.
75 citations
TL;DR: In this paper, the anisotropic thermal and chemical expansion of rhombohedral (R3 )L a 1−xSrxMnO3+δ (x = 0.2, 0.3) was investigated by in situ high temperature X-ray diffraction of submicrometer size powders in pure oxygen and nitrogen (inert) atmospheres.
Abstract: The anisotropic thermal and chemical expansion of rhombohedral (R3 )L a 1−xSrxMnO3+δ (x = 0.2, 0.3) was investigated by in situ high temperature X-ray diffraction of submicrometer size powders in pure oxygen and nitrogen (inert) atmospheres. The thermal expansion of the long axis c was found to be close to twice as high as the thermal expansion of the short axis a. The large thermal expansion of the c-axis is caused by rectification of the antiferrodistortive tilting and decompression of the MnO6/2 octahedra. The unit cell parameters were shown to be strongly dependent on the partial pressure of oxygen, which was attributed to chemical expansion/ contraction due to reduction/oxidation of Mn. Anisotropic chemical expansion/ contraction was more pronounced for the unit cell parameter a than for c, and the chemical expansion/contraction was inferred to reflect the size of the MnO6/2 octahedra. The onset of chemical expansion in nitrogen and contraction in oxygen atmosphere during heating was discussed in terms of a gradual transformation from a nonequilibrium to an equilibrium point defect population in La1−xSrxMnO3+δ. Possible implications of slow relaxation of chemically induced stresses at the nanoscale and in epitaxial thin films are addressed. Finally, a second order phase transition from the ferroelastic (R3) to paraelastic state (Pm3) is reported for La0.7Sr0.3MnO3+δ at 850 ± 25 °C. The temperature of the phase transition decreases with increasing Sr content in La1−xSrxMnO3+δ.
75 citations
TL;DR: In this paper, the thermal expansion coefficients along a- and c-axis are α 1 = 2.2 × 10 -6 /K, and α 3 = 8.4 × 10 −6/K respectively.
Abstract: Nd:YVO 4 crystal has been grown by Czochralski method. The data of thermal expansion and specific heat have been measured. The thermal expansion coefficients along a- and c-axis are α 1 = 2.2 × 10 -6 /K, and α 3 = 8.4 × 10 -6 /K respectively. The specific heat is 24.6 cal/mol K at 330 K. The large anisotropy along c- and a-axis of thermal expansion coefficients is explained by the structure of YVO 4 crystal. 921 mW output laser at 1.06 μm has been obtained with a 3 mm × 3 mm × 1 mm crystal sample when pumped by 1840 mW cw laser diode, and the slope efficiency is 55.5%.
75 citations