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The present study delves into the significant impact of secondary phases created during the formation process of Y 2 W 3 O 12. Thermomiotic ceramic materials exhibit negative thermal expansion (NTE). Among those ceramics, Y 2 W 3 O 12 is distinct for having phase stability over a high-temperature range as well as high volumetric NTE. These properties make Y 2 W 3 O 12 an unprecedented additive for thermal expansion coefficient (CTE) engineering for high-temperature composites. Synthesis of this material is continuously concluded with a higher thermal expansion than the theoretical. To fully take advantage of this material's unique properties, the origin of the mismatched NTE should be fully understood. In this study, the popular solid-state synthesis approach of Y 2 W 3 O 12 across all synthesis steps was examined in detail. Each secondary Y-W-O phase's contribution to the CTE was calculated, and the final value closely aligns with the measured NTE within 3.7 %, demonstrating the impact of secondary phases on the material's thermal behavior. [ABSTRACT FROM AUTHOR]