Michael Auinger, Gerhard Gritzner, Ch. Bertrand, Ph. Galez, Jean-Louis Soubeyroux,
"Formation pathways in the synthesis and properties of (Tl0.5Pb0.5)(Sr0.9Ba0.1)2Ca2Cu3Oz and (Tl0.5Pb0.5)(Sr0.8Ba0.2)2Ca2Cu3Oz-1223 superconductors"
, in Superconductor Science and Technology, Vol. 20, Seite(n) 704 - 708, 2007, ISSN: 0953-2048
Original Titel:
Formation pathways in the synthesis and properties of (Tl0.5Pb0.5)(Sr0.9Ba0.1)2Ca2Cu3Oz and (Tl0.5Pb0.5)(Sr0.8Ba0.2)2Ca2Cu3Oz-1223 superconductors
Sprache des Titels:
Englisch
Original Kurzfassung:
The formation pathway of (Tl0.5Pb0.5)(Sr0.9Ba0.1)2Ca2Cu3Oz and (Tl0.5Pb0.5)(Sr0.8Ba0.2)2Ca2Cu3Oz was studied by neutron and X-ray diffraction. The following reaction pathway was proposed: Thallium oxide and lead oxide react with Sr-rich (Sr1 xCax)CuO2 and Ca-rich (CaxSr1-x)O to form Sr4Tl2O7 and (CaxSr1-x)PbO3, respectively. The thallate and the plumbate compounds then form the (Tl0.5Pb0.5)-1212 phase starting at a temperature of 600 °C. Finally, between 850 °C and 900 °C, the 1223 phase is formed from (Tl0.5Pb0.5)-1212, (CaxSr1 x)2CuO3 and CuO.
Parallel experiments to fabricate the (Tl,Pb)-1223 superconductor resulted in specimens with a critical temperatures of 117.5 K and 116 K, respectively, and transition widths of 2 K. Differences between the pathways for the formation of Pb-doped, Sr rich and Pb-free, Ba rich Tl-1223 superconductors are discussed
Sprache der Kurzfassung:
Deutsch
Englische Kurzfassung:
The formation pathway of (Tl0.5Pb0.5)(Sr0.9Ba0.1)2Ca2Cu3Oz and (Tl0.5Pb0.5)(Sr0.8Ba0.2)2Ca2Cu3Oz was studied by neutron and X-ray diffraction. The following reaction pathway was proposed: Thallium oxide and lead oxide react with Sr-rich (Sr1 xCax)CuO2 and Ca-rich (CaxSr1-x)O to form Sr4Tl2O7 and (CaxSr1-x)PbO3, respectively. The thallate and the plumbate compounds then form the (Tl0.5Pb0.5)-1212 phase starting at a temperature of 600 °C. Finally, between 850 °C and 900 °C, the 1223 phase is formed from (Tl0.5Pb0.5)-1212, (CaxSr1 x)2CuO3 and CuO.
Parallel experiments to fabricate the (Tl,Pb)-1223 superconductor resulted in specimens with a critical temperatures of 117.5 K and 116 K, respectively, and transition widths of 2 K. Differences between the pathways for the formation of Pb-doped, Sr rich and Pb-free, Ba rich Tl-1223 superconductors are discussed
Journal:
Superconductor Science and Technology
Volume:
20
Seitenreferenz:
704 - 708
Erscheinungsjahr:
2007
ISSN:
0953-2048
Anzahl der Seiten:
5
Notiz zur Publikation:
Formation pathways in the synthesis and properties of (Tl0.5Pb0.5)(Sr0.9Ba0.1)2Ca2Cu3Oz and
(Tl0.5Pb0.5)(Sr0.8Ba0.2)2Ca2Cu3Oz – 1223 superconductors
M. Auinger, G. Gritzner, Ch. Bertrand, Ph. Galez and J-L. Soubeyroux
Supercond. Sci. Technol. 20 (2007) 704 – 708
Forschungs-