THE OXIDATION BEHAVIOR OF YTTERBIUM SCANDIUM ZIRCONIUM NITRIDES UNDER NONISOTHERMAL CONDITIONS

Authors

  • Neil J. Martinez Departamento de Ciencia de los Materiales Universidad Simón Bolivar Valle de Sartejenas 1080 Baruta Venezuela
  • Eberhard Schweda Prof. Dr. Eberhard Schweda Universität Tübingen Institut für Anorganische Chemie Auf der Morgenstelle 18 D-72076 Tübingen Tel.: 07071-2976217 oder 07071-2976246 Fax.: 07071-295302
  • Aurora Molina Departamento de Ciencia de los Materiales
  • Francis Cordero Universidad Simón Bolívar Departamento de Ciencias de la Tierra

Abstract

Ytterbium  codoped  scandium  stabilized  zirconia,  Zr0,60 Sc0,175 Yb0,225 O1,8  was  synthesized  and  nitrided  for  48  h  under  an  ammonia atmosphere.  The  compound  obtained  was  nominally  Zr0,60 Sc0,175 Yb0,225 O0,0627 N1,157  with  a  red  color  and  a  cation  deficient  rocksalt structure. Its stability and reoxidation behavior was studied by differential thermal analysis (DTA) and thermogravimetric analysis (TG) under non-isothermal conditions. For evaluation of the experimental data, the Coats Redfern method [1] was used and revealed that the decomposition  of  the  nitride  to  form  ytterbium  scandium  zirconium  oxide  is  diffusion  controlled.  The  activation  energy  for  the decomposition process was found to be 506 KJ/mol compared to 103 KJ/mol for ZrN [2]. The results indicate that scandium-zirconium- nitrides  co-doped  with  lanthanide  metals  undergo  a  reduction  in  O2-  and  N3-  mobility  in  the  crystal  and  consequently  a  delay  in  the reoxidation process.

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Author Biographies

Neil J. Martinez, Departamento de Ciencia de los Materiales Universidad Simón Bolivar Valle de Sartejenas 1080 Baruta Venezuela

Profesor Agregado Departamento de Ciencias de los Materiales

Eberhard Schweda, Prof. Dr. Eberhard Schweda Universität Tübingen Institut für Anorganische Chemie Auf der Morgenstelle 18 D-72076 Tübingen Tel.: 07071-2976217 oder 07071-2976246 Fax.: 07071-295302

Prof. Dr. Jefe del Grupo de Investigación de Quí­mica del estado Sólido

Aurora Molina, Departamento de Ciencia de los Materiales

Profesor Nivel III

Francis Cordero, Universidad Simón Bolívar Departamento de Ciencias de la Tierra

Profesor Investigador, ex jefe del Departamento de Ciencias de la Tierra

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Published

2013-11-19

How to Cite

Martinez, N. J., Schweda, E., Molina, A., & Cordero, F. (2013). THE OXIDATION BEHAVIOR OF YTTERBIUM SCANDIUM ZIRCONIUM NITRIDES UNDER NONISOTHERMAL CONDITIONS. LatinAmerican Journal of Metallurgy and Materials, 275–281. Retrieved from https://www.rlmm.org/ojs/index.php/rlmm/article/view/521

Issue

2014, 34(2)

Section

Regular Articles

License

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