Memorias de investigación
Communications at congresses:
Study of Mixed Alkaline¿Earth Effect in a new family of glasses based on TeO2
Year:2014

Research Areas
  • Chemistry,
  • Physics & space science,
  • Electronic technology and of the communications

Information
Abstract
When the composition is changed by the gradual substitution of an alkaline ion (such as Na+) by another alkaline ion (such as K+), usually the glass properties which depend on the mobility of the modifier ions show a non-linear behavior, acquiring either a maximum or a minimum value at a certain level of substitution. This is commonly associated with the occurrence of processes of viscous flow, ion exchange, electric conductivity, dielectric loss, chemical attack, and mechanical or thermal relaxation, and it is more pronounced at larger differences in the radii of the exchanged alkaline ions. This phenomenon is known as ?Mixed Alkaline Effect? [1]. A similar phenomenon is observed when an alkaline cation is substituted by a non-alkaline cation having the same valence, which is known as ?Mixed Ion Effect?. It is also known that the addition of alkaline- earth modifier cations (such as Mg+2, Ca+2, Ba+2 or Sr+2) affect considerably the ?Mixed Alkaline Effect? occurring in a glass, and although the literature [2-3] gives some examples of anomalies (non-linear behaviour) observed on the properties of some glasses as a result of the gradual substitution of an alkaline-earth modifier by another oxide of the same nature, only very recently the existence of a ?Mixed Alkaline?Earth Effect? has been recognized [4]. The aim of this work is to study of ?Mixed Alkaline?Earth Effect? in a new family of glasses of general formula: 0.8[xBaO(1-x)MgO]0.2TM.2TeO2 with TM (transition metal)= Nb2O5, V2O5, MoO3 and WO3. These new materials will be characterized by impedance spectroscopy, Raman spectroscopy, AFM, density measurements, etc. We are interested in finding out how are affected the material properties mainly with the partial change in the ratio Ba/Mg and which is the influence of transition metals (Nb, V, Mo and W).
International
Si
Congress
Electroceramics XIV Conference|?
960
Place
Bucharest, Romania
Reviewers
Si
ISBN/ISSN
Start Date
16/06/2014
End Date
20/06/2014
From page
116
To page
116
14th edition of ELECTROCERAMICS Conference Abstract Book
Participants
  • Autor: Cintia Soledad Terny UPM
  • Autor: Miguel Ángel De La Rubia López UPM
  • Autor: Roberto Emilio alonso UNIVERSIDAD NACIONAL DE LA PLATA (ARGENTINA)
  • Autor: MARISA FRECHERO 1INQUISUR ¿Universidad Nacional del Sur (ARGENTINA)
  • Autor: Jose de Frutos Vaquerizo UPM
  • Autor: FERNANDO Rubio-Marcos> ICV-CSIC

Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Propiedades ópticas, eléctricas y magnéticas de materiales y sus aplicaciones (POEMMA)
  • Departamento: Electrónica Física