caa a22 4500 445370572 CHVBK 20180317142945.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s00340-011-4510-7 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4510-7 Thermal properties of compressed expanded graphite: photothermal measurements [Elektronische Daten] [J. Bodzenta, J. Mazur, A. Kaźmierczak-Bałata] The thermal diffusivity and the thermal conductivity of compressed expanded graphite (CEG) samples were investigated by photothermal measurements in two geometries differing by a place of temperature disturbance detection. This disturbance can be detected on a surface opposite to the one at which the disturbance was generated (rear detection) or on the same surface (front detection). A measurement based on the rear detection allowed us to determine the effective thermal diffusivity of the sample, while the method with front detection gives the possibility of analysis of homogeneity of the sample. It is shown that the thermal diffusivity of CEG strongly depends on its apparent density. Moreover, CEG samples reveal anisotropy of the thermal properties. The thermal diffusivity in the direction parallel to the compacting axis is lower than the one in the direction perpendicular to it. The parallel thermal diffusivity decreases with growing apparent density, while the perpendicular thermal diffusivity significantly grows when the apparent density grows. The perpendicular thermal conductivity exhibits the same behavior as the perpendicular thermal diffusivity. The parallel thermal conductivity slightly grows with growing density and then reaches a plateau. The anisotropy of CEG samples grows with growing apparent density and vanishes for low-density samples. The photothermal measurement with front signal detection revealed that the CEG samples are non-homogeneous in the direction of the compacting axis and can be modeled by a two-layer system. The Author(s), 2011 Bodzenta J. Institute of Physics, Silesian University of Technology, Krzywoustego 2, 44-100, Gliwice, Poland aut Mazur J. Institute of Physics, Silesian University of Technology, Krzywoustego 2, 44-100, Gliwice, Poland aut Kaźmierczak-Bałata A. Institute of Physics, Silesian University of Technology, Krzywoustego 2, 44-100, Gliwice, Poland aut Applied Physics B Springer-Verlag 105/3(2011-11-01), 623-630 0946-2171 105:3<623 2011 105 340 https://doi.org/10.1007/s00340-011-4510-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4510-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bodzenta J. Institute of Physics, Silesian University of Technology, Krzywoustego 2, 44-100, Gliwice, Poland aut NATIONALLICENCE 700 1- Mazur J. Institute of Physics, Silesian University of Technology, Krzywoustego 2, 44-100, Gliwice, Poland aut NATIONALLICENCE 700 1- Kaźmierczak-Bałata A. Institute of Physics, Silesian University of Technology, Krzywoustego 2, 44-100, Gliwice, Poland aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 105/3(2011-11-01), 623-630 0946-2171 105:3<623 2011 105 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer