Low-temperature heat capacity and heat conductivity of single-crystal synthetic opals |
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| Authors: | V N Bogomolov L S Parfen’eva I A Smirnov H Misiorek A Jezowski A I Krivchikov B I Verkin |
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| Institution: | (1) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(2) Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, 50-850 Wroclaw 2, Poland;(3) Institute for Low-Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkov, 310164, Ukraine |
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| Abstract: | The heat capacity at constant pressure (in the range 3–50 K) and the lattice heat conductivity (from 5 to 75 K) of a single-crystal synthetic opal are measured. It is shown that the heat capacity of the opal behaves at these temperatures in a way similar to porous amorphous materials. The data on the heat conductivity suggest that single-crystal opals can be related to a class of semicrystalline (partially crystallized amorphous) materials. However, because of specific features of their crystal structure, the opals form a nonstandard type of semicrystalline material which we termed semiamorphous. |
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