열전재료 Zn1−xAgxSb의 제조와 특성
Synthesis and characterization of thermoelectric Zn1−xAgxSb compounds
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Zn1−xAgxSb에서 Ag의 함량이 0~0.2인 열전화합물을 진공용해법으로 제조하여 결정상과 열전물성을 조사하였다. x = 0.05에서는 금속성 free Sb 상이 많이 생성되었고 이로 인해 전기전도도와 power factor가 크게 증가하였고 power factor 는 제벡계수보다는 전기전도도에 의해 더 큰 영향을 받았다. x = 0.1 이상에서는 Ag3Sb 상이 현저하게 늘어났고 free Sb 피크는 약화되었다. 이에 따라 전기전도도와 power factor는 감소하기 시작하였고 이러한 경향은 더 많은 Ag가 첨가되면서더욱 뚜렷하게 나타났다.
Abstract
Thermoelectric compounds of Zn1−xAgxSb with x = 0~0.2 were prepared by vacuum melting and quenching process and their crystal phases and thermoelectric properties were examined. It was found that free metallic Sb phases were formed in the compound with x = 0.05, leading to increasing the electrical conductivities. The power factors were significantly affected by the electrical conductivity rather than Seebeck coefficient. When x > 0.05, the peak intensities of Ag3Sb phases in XRD patterns were increased and those of free Sb phases were weakened. These changes of second phases resulted in decreasing the electrical conductivities and the power factors and became more obvious in the compound with x = 0.2.
참고문헌 (12)
- M. I. Fedorov, "New interest in intermetallic compound ZnSb", J. Electronic Mater., 43, pp.2314~ (2014)
- E. Justi, "Untersuchungen an zonengeschmolzenen ZnSb-einkristallen", Advanced Energy Conversion, 4, pp.27~ (1964)
- P. H. M. Böttger, "Influence of ball-milling, nanostructuring, and Ag inclusions on thermoelectric properties of ZnSb", J. Electronic Mater., 39, pp.1583~ (2010)
- C. Okamura, "Preparation of single-phase ZnSb thermoelectric materials using a mechanical grinding process", Mater. Trans., 51, pp.860~ (2010)
- T. Ueda, "Effect of tellurium doping on the thermoelectric properties of ZnSb", Mater. Trans., 50, pp.2473~ (2009)
- D. B. Xiong, "Enhanced thermoelectric figure of merit in p-type Ag-doped ZnSb nanostructured with Ag3Sb", Scripta Materialia, 69, pp.397~ (2013)
- M. I. Fedorov, "Thermoelectric efficiency of intermetallic compound ZnSb", Semiconductors, 48, pp.432~ (2014)
- J. L. Cui, "Thermoelectric properties of Cu-added Zn-Sb based alloys with multi-phase equilibrium", Mater. Charact., 60, pp.824~ (2009)
- K. Valset, "Thermoelectric properties of Cu doped ZnSb containing Zn3P2 particles", J. Appl. Phys., 111, pp.023703~ (2012)
- E. Clementi, "Atomic screening constants from SCF functions", J. Chem. Phys., 38, pp.2686~ (1963)
- B. Cordero, "Covalent radii revisited", Dalton Trans., pp.2832~ (2008)
- W.D. Kingery, "Introduction to Ceramics", pp.134~ (1976), John Wiley & Sons