Study of thermal properties of endellite clay compound |
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Authors: | M S Mostafa A Gaber |
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Institution: | (1) Phys. Dept., Fact. Science, Assiut University, Assiut, Egypt |
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Abstract: | The temperature dependence of the thermal properties (specific heat,C
p, thermal diffusivity,a, and thermal conductivity,K) of endellite clay has been investigated over the temperature rangeR·T T /280 °C using the plane temperature wave technique. The experimental results showed that in the initial stage of temperature rise botha andK diminish exponentially with increasing temperature up to 100 °C. Above 100 °C, the thermal parameters are found to reach stable values, namely,C
p=0.22±0.008 cal g–1 deg–1,a=(5.0±0.18)–10–4 cm2 sec– 1 andK=(2.2±0.16) · 10–4 cal cm–1 sec–1 deg–1. The explanation of the results was supported by using DTA and TG analysis.
Zusammenfassung In einem Temperaturbereich zwischen Raumtemperatur und 280 °C wurde die Temperaturabhängigkeit der thermischen Eigenschaften (spezifische WärmeC
p, Temperaturleitfähigkeita, WärmeleitfähigkeitK) von Endellittonerde untersucht. Die Ergebnisse zeigen, daß sowohla als suchK im ersten Abschnitt der Temperaturzunahme mit steigender Temperatur bis 100 °C exponentiell abnehmen. Oberhalb 100 °C erreichen die Parameter stabile Werte:C
p=0,22 ±0,008 cal g–1 deg–1,a=(5,0±0,18)·10–4 cm2 sec–1 undK=(2,2±0,16)·10–4 cal cm–1 sec–1 deg–1. Die Erklärung der Ergebnisse wurde unter Zuhilfenahme von DTA und TG durchgeführt.
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![ncy](/content/q2155677877p4236/xxlarge1085.gif) ![ycy](/content/q2155677877p4236/xxlarge1099.gif) ![zcy](/content/q2155677877p4236/xxlarge1079.gif) ![ncy](/content/q2155677877p4236/xxlarge1085.gif) ![acy](/content/q2155677877p4236/xxlarge1072.gif) ![chcy](/content/q2155677877p4236/xxlarge1095.gif) ![iecy](/content/q2155677877p4236/xxlarge1077.gif) ![ncy](/content/q2155677877p4236/xxlarge1085.gif) ![icy](/content/q2155677877p4236/xxlarge1080.gif) ![rcy](/content/q2155677877p4236/xxlarge1088.gif) ![acy](/content/q2155677877p4236/xxlarge1072.gif) ![vcy](/content/q2155677877p4236/xxlarge1074.gif) ![ncy](/content/q2155677877p4236/xxlarge1085.gif) ![ycy](/content/q2155677877p4236/xxlarge1099.gif) n= ,22 ±0,008 ![kcy](/content/q2155677877p4236/xxlarge1082.gif) ![acy](/content/q2155677877p4236/xxlarge1072.gif) · –1· ![gcy](/content/q2155677877p4236/xxlarge1075.gif) ![rcy](/content/q2155677877p4236/xxlarge1088.gif) ![acy](/content/q2155677877p4236/xxlarge1072.gif) –1, =5,0±0,18·10–4 ![scy](/content/q2155677877p4236/xxlarge1089.gif) 2· ![scy](/content/q2155677877p4236/xxlarge1089.gif) ![iecy](/content/q2155677877p4236/xxlarge1077.gif) –1 K=2,2±0,16· 10–4 ![kcy](/content/q2155677877p4236/xxlarge1082.gif) ![acy](/content/q2155677877p4236/xxlarge1072.gif) · ![scy](/content/q2155677877p4236/xxlarge1089.gif) –1· ![scy](/content/q2155677877p4236/xxlarge1089.gif) ![iecy](/content/q2155677877p4236/xxlarge1077.gif) –1· ![gcy](/content/q2155677877p4236/xxlarge1075.gif) ![rcy](/content/q2155677877p4236/xxlarge1088.gif) ![acy](/content/q2155677877p4236/xxlarge1072.gif) –1. ![Ocy](/content/q2155677877p4236/xxlarge1054.gif) ![bcy](/content/q2155677877p4236/xxlarge1073.gif) ![scy](/content/q2155677877p4236/xxlarge1089.gif) ![ucy](/content/q2155677877p4236/xxlarge1091.gif) ![zhcy](/content/q2155677877p4236/xxlarge1078.gif) ![dcy](/content/q2155677877p4236/xxlarge1076.gif) ![iecy](/content/q2155677877p4236/xxlarge1077.gif) ![ncy](/content/q2155677877p4236/xxlarge1085.gif) ![icy](/content/q2155677877p4236/xxlarge1080.gif) ![rcy](/content/q2155677877p4236/xxlarge1088.gif) ![zcy](/content/q2155677877p4236/xxlarge1079.gif) ![ucy](/content/q2155677877p4236/xxlarge1091.gif) ![lcy](/content/q2155677877p4236/xxlarge1083.gif) ![softcy](/content/q2155677877p4236/xxlarge1100.gif) ![tcy](/content/q2155677877p4236/xxlarge1090.gif) ![acy](/content/q2155677877p4236/xxlarge1072.gif) ![tcy](/content/q2155677877p4236/xxlarge1090.gif) ![ocy](/content/q2155677877p4236/xxlarge1086.gif) ![pcy](/content/q2155677877p4236/xxlarge1087.gif) ![ocy](/content/q2155677877p4236/xxlarge1086.gif) ![dcy](/content/q2155677877p4236/xxlarge1076.gif) ![tcy](/content/q2155677877p4236/xxlarge1090.gif) ![vcy](/content/q2155677877p4236/xxlarge1074.gif) ![iecy](/content/q2155677877p4236/xxlarge1077.gif) ![rcy](/content/q2155677877p4236/xxlarge1088.gif) ![zhcy](/content/q2155677877p4236/xxlarge1078.gif) ![dcy](/content/q2155677877p4236/xxlarge1076.gif) ![iecy](/content/q2155677877p4236/xxlarge1077.gif) ![ncy](/content/q2155677877p4236/xxlarge1085.gif) ![Dcy](/content/q2155677877p4236/xxlarge1044.gif) ![Tcy](/content/q2155677877p4236/xxlarge1058.gif) ![Tcy](/content/q2155677877p4236/xxlarge1058.gif) ![icy](/content/q2155677877p4236/xxlarge1080.gif) ![zcy](/content/q2155677877p4236/xxlarge1079.gif) ![mcy](/content/q2155677877p4236/xxlarge1084.gif) ![iecy](/content/q2155677877p4236/xxlarge1077.gif) ![rcy](/content/q2155677877p4236/xxlarge1088.gif) ![iecy](/content/q2155677877p4236/xxlarge1077.gif) ![ncy](/content/q2155677877p4236/xxlarge1085.gif) ![icy](/content/q2155677877p4236/xxlarge1080.gif) ![yacy](/content/q2155677877p4236/xxlarge1103.gif) ![mcy](/content/q2155677877p4236/xxlarge1084.gif) .
We wish to thank Dr. N. Afify, Phys. Dept. Assiut University, for his assistance during DTA and TGA analysis. |
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