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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.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Synthesis, characterization, and thermoelectric power study of thallium-based high critical transition temperature superconductors./
作者:
Xin, Ying.
面頁冊數:
146 p.
附註:
Source: Dissertation Abstracts International, Volume: 52-08, Section: B, page: 4292.
Contained By:
Dissertation Abstracts International52-08B.
標題:
Physics, Condensed Matter. -
電子資源:
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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Xin, Ying.
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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
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