Thermal expansion behavior of Ce2Zr2O7 up to 898 K in conjunction with structural analyses by neutron diffraction

AbstractThe thermal expansion behavior of pure, Ge-doped and Li-doped hexagonal cordierites with respective compositions: 2MgO 2Al2O3 5Si02 2Mg0 2Al2O3 4Si02 Ge02) and 2MgO (2+x)AL203 (5-2x)Si02 xLi20 with x = .174, was investigated using time-of-flight neutron powder diffraction at temperatures from 22 to 750°C in vacuum. The data were refined in space group P6/mcc using the Rietveld method. The lattice thermal expansion curves of all 3 samples were quite similar. The negative axis expansion is associated with (1)displacement of the T2 cations generally toward the axis channels and (2) changes in the distortion of the coupled T1/M tetrahedra/octahedra in the structure. Both contributions were present in all 3 samples but the first was more dominant in the Ge doped sample. The nature and origin of the distortions in T1 and M are discussed.

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Thermal Expansion Behavior of Pure and Doped Cordierite by Time-of-Flight Neutron Diffraction

Advances in X-Ray Analysis ◽

10.1007/978-1-4613-1935-1_48 ◽

1987 ◽

pp. 395-405 ◽

Cited By ~ 2

Author(s):

J. Haas ◽

Paul Predecki ◽

J. Faber ◽

R. L. Hitterman

Keyword(s):

Thermal Expansion ◽

Neutron Diffraction ◽

Time Of Flight ◽

Thermal Expansion Behavior ◽

Expansion Behavior

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Thermal stability and thermal expansion behavior of FeCoCrNi2Al high entropy alloy

Advanced Powder Technology ◽

10.1016/j.apt.2020.12.019 ◽

2021 ◽

Author(s):

Mahesh S. Jadhav ◽

Disna Sahane ◽

Amit Verma ◽

Sheela Singh

Keyword(s):

Thermal Stability ◽

Thermal Expansion ◽

High Entropy Alloy ◽

Thermal Expansion Behavior ◽

High Entropy ◽

Expansion Behavior

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Anomalous thermal expansion behaviors of wood under dry and low-temperature conditions

Holzforschung ◽

10.1515/hf-2013-0103 ◽

2014 ◽

Vol 68 (5) ◽

pp. 567-574 ◽

Cited By ~ 3

Author(s):

Tsunehisa Miki ◽

Hiroyuki Sugimoto ◽

Yuzo Furuta ◽

Ichinori Shigematsu ◽

Kozo Kanayama

Keyword(s):

Thermal Expansion ◽

Linear Thermal Expansion ◽

Longitudinal Direction ◽

Mechanical Analysis ◽

Solid Wood ◽

Compression Pressure ◽

Thermal Expansion Behavior ◽

Expansion Behavior ◽

Dry Conditions ◽

Anomalous Thermal Expansion

Abstract The thermal expansion behavior of dry solid wood was investigated by dynamic dilatometry and thermal mechanical analysis. Anomalous thermal expansion behavior was observed concerning the displacement change under a constant compression pressure, which was not previously reported. Wood submitted to temperatures below 0°C under dry conditions exhibited a large increment in the linear thermal expansion coefficient (CLTE) and a sudden drop in the CLTE around 50°C as well as above 130°C during heating. In subsequent cooling/heating processes, these anomalous behaviors remained at temperatures below 100°C, although less pronounced, and disappeared at temperatures above 100°C. These behaviors were clearly perceptible in the radial and tangential directions but not in the longitudinal direction. The CLTE depended strongly on the heat and moisture history of the samples and the effects are species-specific.

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