Possible structural phase transition near 210 K of single-phase Bi(Pb)-Sr-Ca-Cu-O superconducting ceramics

He Yusheng; Xiang Jiong; Wang Xin; He Aisheng; Zhang Jincang; Chang Fanggao

doi:10.1103/PhysRevB.40.7384

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Possible structural phase transition near 210 K of single-phase Bi(Pb)-Sr-Ca-Cu-O superconducting ceramics

He Yusheng, Xiang Jiong, Wang Xin, He Aisheng, Zhang Jincang, Chang Fanggao

DOI 10.1103/PhysRevB.40.7384 · Physical Review B

T1

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Abstract

Ultrasonic measurements on 2:2:1:2 and 2:2:2:3 single-phase samples of Bi-Sr-Ca-Cu-O and BiPb-Sr-Ca-Cu-O have been carried out. It was found for the first time that there is an anomalous structure change near 210 K in these Bi-based superconducting ceramics. Detailed studies revealed that the sudden change in sound attenuation and velocity is an isothermal-like process. Thermal analysis and specific-heat measurements proved that this anomalous change has characteristics of a phase transition. X-ray diffraction experiments showed sudden increases in lattice constants a and c indicating some fine-structure changes during this transition.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	74	Pressure not reported	zero_resistance
Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	zero_resistance
Bi2Sr2Ca2Cu3O10+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	107	Pressure not reported	zero_resistance
Bi2Sr2Ca2Cu3O10+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	112	Pressure not reported	zero_resistance
(Bi1-yPby)2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	74	Pressure not reported	zero_resistance
(Bi1-yPby)2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	zero_resistance
(Bi1-yPby)2Sr2Ca2Cu3O10+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	107	Pressure not reported	zero_resistance
(Bi1-yPby)2Sr2Ca2Cu3O10+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	112	Pressure not reported	zero_resistance
Bi1.70Pb0.30Sr2Ca2Cu3O10+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	107	Pressure not reported	zero_resistance
Bi1.70Pb0.30Sr2Ca2Cu3O10+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	112	Pressure not reported	zero_resistance
YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown