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Synthesis, characterization, and the...

Xin, Ying.

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Synthesis, characterization, and thermoelectric power study of thallium-based high critical transition temperature superconductors.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Synthesis, characterization, and thermoelectric power study of thallium-based high critical transition temperature superconductors./
Author:	Xin, Ying.
Description:	146 p.
Notes:	Source: Dissertation Abstracts International, Volume: 52-08, Section: B, page: 4292.
Contained By:	Dissertation Abstracts International52-08B.
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9204781

Synthesis, characterization, and thermoelectric power study of thallium-based high critical transition temperature superconductors.
Xin, Ying.

Synthesis, characterization, and thermoelectric power study of thallium-based high critical transition temperature superconductors. - 146 p.

Source: Dissertation Abstracts International, Volume: 52-08, Section: B, page: 4292.

Thesis (Ph.D.)--University of Arkansas, 1991.

New Tl-based 1212 type superconductors, 100 K (TlSubjects--Topical Terms:

1018743
Physics, Condensed Matter.

Synthesis, characterization, and thermoelectric power study of thallium-based high critical transition temperature superconductors.
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008 130614s1991 eng d
035 $a (UnM)AAI9204781
035 $a AAI9204781
040 $a UnM $c UnM
100 1 $a Xin, Ying. $3 1948755
245 1 0 $a Synthesis, characterization, and thermoelectric power study of thallium-based high critical transition temperature superconductors.
300 $a 146 p.
500 $a Source: Dissertation Abstracts International, Volume: 52-08, Section: B, page: 4292.
500 $a Adviser: Zhengzhi Sheng.
502 $a Thesis (Ph.D.)--University of Arkansas, 1991.
520 $a New Tl-based 1212 type superconductors, 100 K (Tl $\ sb{0.8} $\ sb{0.2} $) -Sr $\ sb2 $( R,Sr)Cu $\ sb2 $\ sb{7-\delta} $ and 110 K TlSr $\ sb2 $( Ca,Cr)Cu $\ sb2 $\ sb{7-\delta} $ have been synthesized and studied on superconductivity and crystal structure. Systematical study on the thallium-based nominal MTlBaCuO $\ sb{\rm x} $ (M = Zn, Cd, and Hg), TlSr $\ sb2 $( R,Sr)Cu $\ sb2 $\ sb{\rm x} $ (R = rare earths), and Tl $\ sb2 $\ sb{0.2} $\ sb2 $\ sb2 $\ sb3 $\ sb{\rm x} $ (M = Na, K, Rb, Cr, Re, Zn, Cd, Hg, Se, and Te) samples have been conducted. The investigations were performed by resistance and ac susceptibility measurements, and powder x-ray diffraction. The addition of Zn, Cd, or Hg into Tl-Ba-Cu-O has some remarkable influences on superconductivity and mechanical properties as well as the required preparation condition. For the Tl(Tl,Pb)-Sr-R-Cu-O 1212 type system the optimum composition and the elemental effect of different rare earths are discussed and concluded in terms of the average Cu valence in the CuO $\ sb2 $ plane and the ionic radii of the rare earths. The partial substitution of Pb for Tl raises the Tc in TlSr $\ sb2 $( R,Sr)Cu $\ sb2 $\ sb{\rm x} $ by about 10 degrees. High quality Tl-(M)-Ba-Ca-Cu-O 2223 superconductors were synthesized by a novel preparation procedure. The 2223 material with Tc of about 120 K and phase purity greater than 95% exhibits much improved mechanical properties.
520 $a A convenient and reliable thermoelectric power measurement apparatus has been established. Measurements on the 1212 phase TlSr $\ sb2 $( Er $\ sb{\rm 1-y} $\ sb{\rm y} $) Cu $\ sb2 $\ sb{7-\delta} $ and 2223 phase Tl $\ sb2 $\ sb{0.2} $\ sb2 $\ sb2 $\ sb3 $\ sb{10-\delta} $ were carried out. The results show that the hole concentration in the 1212 phase plays a crucial rule on charge transport properties and superconductivity. It is possible that two-band conduction is involved in the charge transport at normal state for the 2223 phase.
590 $a School code: 0011.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Electricity and Magnetism. $3 1019535
690 $a 0611
690 $a 0607
710 2 0 $a University of Arkansas. $3 1017562
773 0 $t Dissertation Abstracts International $g 52-08B.
790 1 0 $a Sheng, Zhengzhi, $e advisor
790 $a 0011
791 $a Ph.D.
792 $a 1991
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9204781