Segregation driving forces in perovskite titanates

Gabor Horvath, Josef Gerblinger, H. Meixner, János Giber

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The surface-segregation properties of perovskite titanate-based solid-state sensor materials are investigated by Auger and secondary ion mass spectroscopy (SIMS) methods. The experimental findings are interpreted in terms of a thermodynamic model, which considers the so-called 'generalized surface free enthalpies' and the effect of the ambient gas atmosphere as the major driving forces of segregation. As well as the qualitative comparison of the experimental results and the model predictions, a semi-empirical calculation is also performed to estimate the actual values of these main driving forces. It is found that, although both effects have considerable impact on the surface composition, the influence of the 'generalized surface free enthalpies' is predominant.

Original languageEnglish
Pages (from-to)93-99
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume32
Issue number2
DOIs
Publication statusPublished - May 1996

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titanates
Perovskite
Enthalpy
Solid-state sensors
Surface segregation
Surface structure
Gases
enthalpy
Spectroscopy
Thermodynamics
Ions
mass spectroscopy
solid state
atmospheres
thermodynamics
perovskite
sensors
estimates
predictions
gases

Keywords

  • Perovskite titanates
  • Strontium titanate
  • Surface segregation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this

Segregation driving forces in perovskite titanates. / Horvath, Gabor; Gerblinger, Josef; Meixner, H.; Giber, János.

In: Sensors and Actuators, B: Chemical, Vol. 32, No. 2, 05.1996, p. 93-99.

Research output: Contribution to journalArticle

Horvath, Gabor ; Gerblinger, Josef ; Meixner, H. ; Giber, János. / Segregation driving forces in perovskite titanates. In: Sensors and Actuators, B: Chemical. 1996 ; Vol. 32, No. 2. pp. 93-99.
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