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Abstract
from the obtained results and discussion one can conclude the
following:-
1. Alkali sulfate based solid electrolytes of 2M2CO3 : H2SO4 :
H3PO4 system, M = Cs, K and NH4 , crystallize in an
orthorhombic unit cell without any change in the structure
fingerprint of alkali sulfates due to the perturbation in the
bonding scheme by hydrogen or phosphorus.
2. Alkali sulfate based solid electrolytes undergoes ferroelectric
- paraelectric phase transition near to the room temperature
due to introducing interstitial hydrogen into the structure.
3. Electrical and dielectric properties of PMMA / alkali sulfate
based solid electrolytes composites are very sensitive to the
ferroelectric - paraelectric phase transition of the solid
electrolyte.
4. Cesium sulfate based solid electrolyte is attractive alternative
to potassium hydroxide alkaline electrolyte solution for
Nickel metal hydride battery.
5. The partial replacement of sulfur with phosphorus ions in the
scheme of ammonium sulfate downward the superprotonic
transition temperature from 440 K for pure ammonium
sulfate to 400 K for ammonium sulfate based solid
electrolyte. This nominates ammonium sulfate based solid
electrolyte to be a promising inorganic solid electrolyte for
fuel cells systems that work at relatively low temperatures.