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- 저자 : Kotmool, Komsilp (검색결과 2 건)
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Revealing an unusual transparent phase of superhard iron tetraboride under high pressure
Kotmool, Komsilp,Kaewmaraya, Thanayut,Chakraborty, Sudip,Anversa, Jonas,Bovornratanaraks, Thiti,Luo, Wei,Gou, Huiyang,Piquini, Paulo Cesar,Kang, Tae Won,Mao, Ho-kwang,Ahuja, Rajeev National Academy of Sciences 2014 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.111 No.48
<P><B>Significance</B></P><P>Solids have been mainly studied at ambient conditions (i.e., at room temperature and zero pressure). However, it was realized early that there is also a fundamental relation between volume and structure and that this dependence could be most fruitfully studied by means of high-pressure experimental techniques. From a theoretical point of view this is an ideal type of experiment, because only the volume is changed, which is a very clean variation of the external conditions. In the present study we show a hard superconducting material, iron tetraboride, transforms into a novel transparent phase under pressure. Further, this phase is the first system in this class, to our knowledge, and opens a new route to search for and design new transparent materials.</P><P>First principles–based electronic structure calculations of superhard iron tetraboride (FeB<SUB>4</SUB>) under high pressure have been undertaken in this study. Starting with a “conventional” superconducting phase of this material under high pressure leads to an unexpected phase transition toward a semiconducting one. This transition occurred at 53.7 GPa, and this pressure acts as a demarcation between two distinct crystal symmetries, metallic orthorhombic and semiconducting tetragonal phases, with <I>Pnnm</I> and <I>I</I>4<SUB>1</SUB>/<I>acd</I> space groups, respectively. In this work, the electron–phonon coupling-derived superconducting T<SUB><I>c</I></SUB> has been determined up to 60 GPa and along with optical band gap variation with increasing pressure up to 300 GPa. The dynamic stability has been confirmed by phonon dispersion calculations throughout this study.</P>
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O. Promsod,A. Kongtana,K. Kotmool 국제과학영재학회 2010 APEC Youth Scientist Journal Vol.2 No.-
The solar oven is an invention used for cooking. This is one way to reduce using electric energy by using renewable energy: solar energy. The purpose of this study is to compare the effects of pressure on the efficiency of the solar oven. The oven is made in a 30-centimeterdiameter cylinder shape from 1.25-millimeter-thick iron and covered with heat resistor. The cover is made with 8-millimeter-thick transparent acrylic that has a transmitting efficiency of about 0.80. The ratio of the volume of the oven per area of cover is 13.75. In addition, this oven has a reflector that can adjust the angle for proper sunlight direction to come inside the solar oven. In this experiment, we compared experiments at pressures of 1 and 2 atm by increasing the air inside the solar oven. At 2 atm, the temperatures of air and water had trended to steady state faster than at 1 atm .The heat efficiency of water in higher pressure was greater, while the temperature at 2 atm was more stable than that at 1 atm.
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