Thermal stability and hopping conduction in Bi4Sr3Ca3CuxOy glasses (x = 4–9)

Komatsu, Takayuki; Nakakura, Masayuki; Sato, Ryuji; Khaled, Jabri; Matusita, Kazumasa

doi:10.1016/0022-3093(95)00528-5

Cited by 12 publications

(5 citation statements)

References 34 publications

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“…Increasing interest is being devoted to the study of transition metal oxide ͑TMO͒ glasses 1-6 because of their probable applications in switching and other devices mentioned by Sadhukhan et al 6 Very recently Komatsu et al 7 made detailed investigation of the stability and hopping conduction behavior of the multicomponent Bi 4 Sr 3 Ca 3 Cu x O y (xϭ4 -9) or ͑4334͒ type TMO glasses which become high T c superconductors in their corresponding ceramic phases obtained by annealing the glasses at higher temperatures ͑above glass transition temperature T g ͒. When these glasses are heat treated above T g , two-dimensional CuO 2 layers, crucial to high-temperature superconductivity, are formed.…”

Section: Introductionmentioning

confidence: 98%

Structural and transport properties of (Bi,Pb)4Sr3Ca3Cu4−mFemOx (m=0–0.06) glasses: Precursors for high Tc superconductors

Chatterjee

Bhattacharya

Chaudhuri

1998

The Journal of Chemical Physics

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Microstructure and transport properties (between 80–450 K) of the Fe doped as-quenched Bi3Pb1Sr3Ca3Cu4−mFemOx (m=0.0, 0.02, 0.04, 0.05, and 0.06) type multicomponent glassy precursors for high-temperature superconductors were first reported in this paper. It has been shown from x-ray diffraction, scanning electron microscopy, thermal analysis, density, and oxygen molar volume measurements that single phase homogeneous glasses are formed. Even with small addition of Fe, a large change of glass transition temperature (Tg) indicates appreciable change of glass network structure of the undoped (Bi,Pb)4Sr3Ca3Cu4Ox glass which is reflected in the properties of the corresponding high-temperature annealed glass termed as glass-ceramic (GC) samples. These GC samples are found to be superconductors. Addition of Fe is considered to break up some of the original Cu–O–Cu bonds forming some new Cu–O–Fe and Fe–O–Fe type bonds. A nonlinearity (increase) in the dc conductivity (σdc) of the as-quenched glass sample is observed around m=0.02. This increase of dc conductivity is ascribed to be due to the additional hopping between Fe2+ and Fe3+ which finally destroys superconductivity for m⩾0.06. This is also responsible for the nonlinear variation of activation energy of the Fe doped glass and hence change in the superconducting properties of the glass ceramics. The high temperature (above θD/2, θD being the Debye temperature) σdc data of the glasses were explained by considering small polaron hopping conduction mechanism. The dc conductivity of these glasses are found to follow Greaves’ variable range hopping model in the intermediate range of temperature. The polaron hopping model of Schnakenberg and Emin can predict the conductivity data in the high-temperature regime. All the Fe-doped glass ceramics showed superconducting transitions with Tc between 100 and 110 K. The corresponding zero resistance temperature, Tco which is maximum (79 K) for m=0, decreases consistently with increase of Fe-concentration and finally superconducting behavior is destroyed for m⩾0.06. This behavior is consistent with-pair breaking mechanism.

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Section: Introductionmentioning

confidence: 98%

Structural and transport properties of (Bi,Pb)4Sr3Ca3Cu4−mFemOx (m=0–0.06) glasses: Precursors for high Tc superconductors

Chatterjee

Bhattacharya

Chaudhuri

1998

The Journal of Chemical Physics

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“…Glassy Bi4-nPb,Sr3Ca3C~40, (BiPb-4334) systems are very good precursors for high-Tc superconductors and have attracted considerable interest in recent years (Abe et al 1988, Minami et al 1988, Kim et al 1992, Sharma et al 1992, RoblinSemene et al 1992, Aruchamy et al 1993, Mollah et al 1995, Chatterjee et al 1996a, Komatsu et al 1996, Rajendran et al 1997. These Bi-4334 glasses become Bi-2212-type ceramic superconductors (Baker et al 1989, Chaudhuri ef al.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti doping on the transport properties of thick films of (Bi, Pb)–Sr–Ca–(Cu, Ti)–O-type glass–ceramic superconductors

Barik

Bhattacharya

Chatterjee

et al. 1999

Philosophical Magazine B

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“…10. The as-quenched material of Bi 2 Sr 2 CaCu 2 O 8 and Bi 4 Sr 3 Ca 3 Cu 4 O 16 were found to be completely amorphous as also presented in the literature [4,12,66].…”

Section: Melt and Quenching Process Of Nominal Bi 2 Sr 2 Cacu 2 O 8 Amentioning

confidence: 61%

“…Cu 2 O + 1/2O 2 . This loss must be balanced during the further crystallization by oxidization to be able to form the Bi 2 Sr 2 Ca 2 Cu 3 O 10 high-T c phase with a higher mean copper valence [64][65][66]. The real oxygen content was not measured because no precise analytical method was available at that time.…”

Section: Introductionmentioning

confidence: 99%