Chemical substitution is an effective strategy to control the thermal expansion properties in solid solutions. In this work, a series of solid solutions Cu2-xZnxP2O7 (0 ≤ x ≤ 2) were synthesized by solid state reaction methods. The thermal expansion in Cu2-xZnxP2O7 is tuned from strong negative thermal expansion (αv ∼ -33.5×10−6 K−1, 100 - 375K) to near zero thermal expansion (αv ∼ -2.78×10−6 K−1, 100 - 225K), and then to positive thermal expansion gradually with increasing content of Zn2+ substitution. The direct experiment results reveal that the Zn2+ substitution diminishes the rigidity of Cu/Zn-O and P-O bonds and the transverse vibrations of O atoms arousing negative thermal expansion. The present work achieves the regulation of thermal expansion from negative to near zero and finally to positive in the Cu2P2O7 system.

Tuning thermal expansion from strong negative to zero to positive in Cu2-xZnxP2O7 solid solutions

Sanson A.;Venier A.;
2022

Abstract

Chemical substitution is an effective strategy to control the thermal expansion properties in solid solutions. In this work, a series of solid solutions Cu2-xZnxP2O7 (0 ≤ x ≤ 2) were synthesized by solid state reaction methods. The thermal expansion in Cu2-xZnxP2O7 is tuned from strong negative thermal expansion (αv ∼ -33.5×10−6 K−1, 100 - 375K) to near zero thermal expansion (αv ∼ -2.78×10−6 K−1, 100 - 225K), and then to positive thermal expansion gradually with increasing content of Zn2+ substitution. The direct experiment results reveal that the Zn2+ substitution diminishes the rigidity of Cu/Zn-O and P-O bonds and the transverse vibrations of O atoms arousing negative thermal expansion. The present work achieves the regulation of thermal expansion from negative to near zero and finally to positive in the Cu2P2O7 system.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3413259
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