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Molten gallium flux synthesis of kno...

Bryan, John Daniel.

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Molten gallium flux synthesis of known thermoelectric and novel magnetic inorganic clathrate compounds: Improving thermoelectric performance.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Molten gallium flux synthesis of known thermoelectric and novel magnetic inorganic clathrate compounds: Improving thermoelectric performance./
Author:	Bryan, John Daniel.
Description:	171 p.
Notes:	Source: Dissertation Abstracts International, Volume: 63-01, Section: B, page: 0253.
Contained By:	Dissertation Abstracts International63-01B.
Subject:	Chemistry, Inorganic. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3041219
ISBN:	049354562X

Molten gallium flux synthesis of known thermoelectric and novel magnetic inorganic clathrate compounds: Improving thermoelectric performance.
Bryan, John Daniel.

Molten gallium flux synthesis of known thermoelectric and novel magnetic inorganic clathrate compounds: Improving thermoelectric performance. - 171 p.

Source: Dissertation Abstracts International, Volume: 63-01, Section: B, page: 0253.

Thesis (Ph.D.)--University of California, Santa Barbara, 2002.

Molten gallium metal has been used as a solvent to grow large single crystals of known inorganic thermoelectric clathrates Sr8Ga 16Ge30, Ba8Ga16Ge30, and Ba8Ga16Si30. X-ray diffraction, thermal analysis, electron microprobe, Glow Discharge Mass Spectrometry, temperature dependent electrical conductivity and Seebeck coefficient measurements characterized the single crystals. The Thermoelectric performance was shown to be heavily dependent on the synthetic conditions including container choice, thermal history and impurity concentration.

ISBN: 049354562XSubjects--Topical Terms:

517253
Chemistry, Inorganic.

Molten gallium flux synthesis of known thermoelectric and novel magnetic inorganic clathrate compounds: Improving thermoelectric performance.
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100 1 $a Bryan, John Daniel. $3 1944541
245 1 0 $a Molten gallium flux synthesis of known thermoelectric and novel magnetic inorganic clathrate compounds: Improving thermoelectric performance.
300 $a 171 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-01, Section: B, page: 0253.
500 $a Chair: Galen D. Stucky.
502 $a Thesis (Ph.D.)--University of California, Santa Barbara, 2002.
520 $a Molten gallium metal has been used as a solvent to grow large single crystals of known inorganic thermoelectric clathrates Sr8Ga 16Ge30, Ba8Ga16Ge30, and Ba8Ga16Si30. X-ray diffraction, thermal analysis, electron microprobe, Glow Discharge Mass Spectrometry, temperature dependent electrical conductivity and Seebeck coefficient measurements characterized the single crystals. The Thermoelectric performance was shown to be heavily dependent on the synthetic conditions including container choice, thermal history and impurity concentration.
520 $a Inorganic Clathrates have attracted intense interest in last several years as potential new materials for thermoelectric devices. If a small to moderate increase in thermoelectric performance over the currently used materials is realized, substantial environmental and technological gains could be achieved. Since thermoelectric refrigeration modules require no moving parts or heat exchange gas (freon) they offer significant advantages over conventional refrigeration technology that tends to fail due to the finite lifetime of the pumping equipment. High temperature devices are also extremely useful for power generation in harsh unforgiving environments where excess heat is available.
520 $a The thermoelectric performance, primarily at room temperature, of these compounds was found to be heavily dependent on the synthetic procedures used to obtain them. A flux growth procedure was developed to overcome the problems of the traditional melt-quench-anneal solid-state chemical approach. This procedure yielded large single crystals of the Sr8Ga16Ge 30, Ba8Ga16Ge30 and Ba8Ga 16Si30 compounds which ready facilitated their chemical and electronic study. Finally, an outlook on the application of these compounds as thermoelectric devices is given.
520 $a Application of the flux method to other systems was also successful in the discovery of two new inorganic clathrate compounds: type IV Eu4Ga 8Ge16 and type V Yb8Ga16Ge14. The Eu4Ga8Ge16 compound was found to be antiferromagnetic with a Tc of 8 K. The compound was investigated by orientated single crystal magnetic susceptibility, heat capacity, Mössbauer spectroscopy and polarized magnetic neutron diffraction. The compound exhibited a nearest-neighbor 1-dimensional ferromagnetic interaction in an overall 3-dimensional ordered antiferromagnetic state. Spin-flop experiments were used to extract the antiferromagnetic exchange coupling constant. The adherence to the Zintl concept was investigated by Mössbauer spectroscopy.
590 $a School code: 0035.
650 4 $a Chemistry, Inorganic. $3 517253
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0488
690 $a 0794
710 2 0 $a University of California, Santa Barbara. $3 1017586
773 0 $t Dissertation Abstracts International $g 63-01B.
790 1 0 $a Stucky, Galen D., $e advisor
790 $a 0035
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3041219