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Thermal evolution of ceramic powders surrounding the YBa2Cu3O7–x composition

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Abstract

Organometallic-derived ceramic compositions surrounding YBa2Cu3O7–x (123) were evaluated via DTA-TG runs and dilatometric densification. The compositions were either Y, Ba or Cu deficient respect to 123. For the Yttrium deficient compact the presence of liquids containing 0–1.3 mole %YO1.5—capable of dissolving the 123 grains—can promote a rapid sintering behavior. For Copper deficient compact the main densification/contraction mechanisms were delayed till 985 °C. For both Barium and Copper deficient compacts a strong exudation of liquids was detected at 990 °C and 1020 °C, respectively.

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Abbreviations

123:

YBa2Cu3O7

001:

CuO

011:

BaCuO2

211:

Y2BaCuO5

202:

Y2Cu2O5

Δm/mo :

Relative mass variation

mo :

Initial mass

ΔL/Lo:

[Lo-L(T)]/Lo: absolute shrinkage

Lo:

Initial thickness of the pellet

L(T):

Instantaneous thickness of the sample at temperature T

d(ΔL/Lo)/dT:

Rate of linear shrinkage

ΔHi :

Enthalpy of reaction i

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Acknowledgements

The authors thank to Mr. Sergio Ribeiro for the NAA measurements, to Mr. Carlos Cotaro and Mrs. Silvia Dútrus for the SEM/EDAX imaging and measurements, and, to Mr. Daniel Quattrini for the DTA/TG measurements. It is acknowledged the financial support of the Centro Atómico Bariloche Superconductivity Group, which allowed the purchase of the main parts of the dilatometer. It is thank the critical reading of this work by Dr. J. M. Rincón of Instituto E. Torroja (Madrid, Spain).

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Authors and Affiliations

  1. Facultad Regional San Nicolás, Universidad Tecnológica Nacional, B2900LWH, San Nicolás, Argentina

    Edgardo R. Benavidez

  2. Centro Atómico Bariloche (CNEA), Av. Bustillo km.9.5, 8400, Bariloche, Argentina

    Carlos J. R. González Oliver

  3. C.O.N.I.C.E.T, Av. Rivadavia 1917, 1033, Buenos Aires, Argentina

    Carlos J. R. González Oliver

Authors
  1. Edgardo R. Benavidez
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  2. Carlos J. R. González Oliver
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Correspondence to Edgardo R. Benavidez.

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Benavidez, E.R., González Oliver, C.J.R. Thermal evolution of ceramic powders surrounding the YBa2Cu3O7–x composition. J Therm Anal Calorim 99, 369–375 (2010). https://doi.org/10.1007/s10973-009-0004-9

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  • DOI: https://doi.org/10.1007/s10973-009-0004-9

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