Very low thermal expansion materials operative over selective temperature region by tailoring the tetragonality of PbTiO3

The article deals with the thermal expansion properties of some diluted PbTiO3 (PT) based ceramic compounds. We have tailored the negative thermal expansion (NTE) coefficient of PT by substituting both at the Pb and Ti sites with different elements, with an intention to achieve very low thermal expansion coefficient. The choice of substitutional elements with appropriate proportions gives us materials with very low thermal expansion, operative over a wide range of temperature (from well above the room temperature to well below it). Moreover, we have shown an effective way to select the operative temperature region of their performance, even without performing the actual dilatometric experiment.

Automated summary

The article explores the thermal expansion properties of diluted PbTiO3 (PT) based ceramic compounds, aiming to achieve very low thermal expansion coefficient by substituting elements at specific sites. Through selecting substitutional elements with appropriate proportions, materials with very low thermal expansion operating over a wide temperature range have been successfully developed. Additionally, an effective method to determine the operative temperature region of their performance has been demonstrated without actual dilatometric experiments.