Tailoring Thermal Expansion of (LiFe)0.5Cu2-P2O7 via Codoping LiFe Diatoms in Cu2P2O7 Oxide.Tailoring the thermal expansion coefficient of negative thermal expansion (NTE) materials to achieve near-zero thermal expansion has attracted great attention recently.  With increasing the diatomic LiFe in (LiFe)0.5Cu2-P2O7, new Raman bands corresponding to LiFeP2O7 appear and the NTE coefficient decreases gradually to near-zero thermal expansion at x = 1 (αv = -0.90 × 10-6 °C-1, -100 to 55 °C). 
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