Dielectric properties of sol–gel derived barium strontium titanate thin films
| Autor: | Sharmistha Lahiry, Abhai Mansingh |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Strontium
Materials science Transition temperature Metals and Alloys Analytical chemistry chemistry.chemical_element Mineralogy Surfaces and Interfaces Dielectric Atmospheric temperature range Ferroelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Amorphous solid chemistry.chemical_compound chemistry Materials Chemistry Strontium titanate Dielectric loss |
| Zdroj: | Thin Solid Films. 516:1656-1662 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2007.05.008 |
| Popis: | Barium strontium titanate (BaxSr1−xTiO3) films were deposited by sol–gel technique on platinized silicon substrate for the composition range x = 0.0 to 1.0 in steps of 0.1. The as-deposited films were found to be amorphous. The films crystallize on annealing in air at 700 °C for 1 h. Dielectric constant (e′) and loss tangent (tanδ) were measured in the temperature range − 180 °C to 150 °C in the frequency range 0.1 to 100 kHz. Both e′ and tanδ show a small dispersion for all the compositions. This dispersion is more at the peak value than at room temperature. A comparison of the room temperature and peak value of the dielectric constant for various compositions are made with the reported values. Transition temperatures are reported for the entire composition range. All the compositions show a transition from ferroelectric to paraelectric phase except strontium titanate. Transition temperature shows a systematic decrease with increase in strontium content. The variation is at a rate of 3.4 °C/mol% of SrTiO3. Curie constants are also reported for the entire composition range. |
| Databáze: | OpenAIRE |
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