Defect
concentration in Ti-substituted YIG from TG curves |
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Authors: | A González Arias C Torres C de
Francisco J M Muñoz P Hernández
Gómez O Alejos O Montero J I Iñiguez |
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Institution: | (1) Departamento Física Aplicada, Universidad de La Habana, Cuba;(2) Departamento Electricidad y Electrónica, Universidad de Valladolid, Spain;(3) Departamento Física Aplicada, Universidad de Salamanca, Spain |
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Abstract: | The article discusses theory and experiment about the measurement of
defect concentration in Ti-substituted yttrium iron garnet by means of thermogravimetry
techniques. The two possible cases arising from oxygen interchange with atmosphere,
oxygen vacancies and interstitial cations, may be analyzed quantitatively
from the derived expressions. The possibility of another type of defects being
present in the samples, not associated to oxygen evolution, is not excluded.
Measurements were carried out in air and CO2 for different
Ti contents. The substitution tends to increase slightly the defect parameter
θ in YIG, while a CO2 reducing atmosphere is
much more effective than the Ti substitution for increasing θ. Calculations
for a given single-phased sample sintered in air show two possibilities: a
deficit of one oxygen atom for every 2.5 unit cells of 96 atoms, or one excess
cation for every 3.5 cells. Other samples show very similar results. The accuracy
involved in the measurements is about 2–3%. |
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Keywords: | garnets lattice defects thermogravimetry |
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