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New cryogenic phase transitions in SrSnO3.
Manoj K Singh1, J W Hong, N K Karan
1Center of Material Science, University of Allahabad, Allahabad 211002, India.
Summary
Strontium stannate exhibits unexpected phase transitions at 160 K and 270 K, challenging its use as an ultra-stable dielectric material for low-temperature microelectronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Strontium stannate is investigated for its potential as a highly stable dielectric material.
- Its dielectric constant is known to be stable across a wide temperature range (27 K to room temperature).
Purpose of the Study:
- To investigate anomalies observed in the physical properties of strontium stannate.
- To identify and characterize potential structural phase transitions in strontium stannate.
Main Methods:
- Raman spectroscopy
- Dielectric response measurements
- Differential thermal analysis (DTA)
- Calorimetry
- X-ray powder diffraction (XRD)
Main Results:
- Anomalies in Raman spectra, dielectric response, and DTA indicate a phase transition at 160 K.
- Calorimetric and Raman data suggest a second phase transition around 270 K, not observed in dielectric measurements.
- Preliminary XRD confirms a minor change in the pseudo-cubic lattice constant at the 160 K transition.
Conclusions:
- Strontium stannate undergoes structural phase transitions at 160 K and 270 K.
- These transitions impact its suitability as an ultra-stable dielectric material for low-temperature microelectronic applications.
- Further research is needed to fully understand the nature and implications of these phase transitions.
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