Optimized negative thermal expansion property in low-cost Mg2P2O7-based bulk material

Control of Thermal Expansion in TaVO5 by Double Chemical Substitution

“…The progressive substitution of Ni by Mn atoms reduces the NTE phase-transition temperature from 820 K of Ni 2 P 2 O 7 to 180 K of Ni 1.4 Mn 0.6 P 2 O 7 until obtaining a ZTE in Ni 1.4 Mn 0.6 P 2 O 7 (α l = −0.97 × 10 –6 K –1 ) . Additionally, it can also be observed that in Mg 2– x Cu x P 2 O 7 , the NTE temperature range was expanded from 14 K of Mg 2 P 2 O 7 to 173 K of Mg 1.8 Cu 0.2 P 2 O 7 , with a ZTE behavior (α l = −0.57 × 10 –6 K –1 ) for the latter composition …”

The formation energy, phase transition, and negative thermal expansion of Fe2−xScxW3O12

“…However, NTE materials still have some disadvantages in practical applications, such as hygroscopicity, 18 toxicity, 19 a narrow NTE temperature range, 20 sensitivity toward high temperatures, 21 negative environment impacts, 22 and difficult synthesis. 23…”

“…In recent years, significant progress has been made in NTE materials, such as framework oxides, [1][2][3][4][5][6][7][8][9] fluorides, [10][11][12] and cyanides. [13][14][15][16][17] However, NTE materials still have some disadvantages in practical applications, such as hygroscopicity, 18 toxicity, 19 a narrow NTE temperature range, 20 sensitivity toward high temperatures, 21 negative environment impacts, 22 and difficult synthesis. 23 Oxide-based NTE materials with a stable structure and wide NTE temperature range offer an excellent platform for designing novel NTE materials with the desired properties for potential applications.…”

Origin of Near-Zero Thermal Expansion in A2O(PO4)2 Oxides over an Ultrawide Temperature Range

“…Since then, several NTE materials have been discovered, such as framework fluorides, , oxides, − cyanides and Prussian blue analogues, − manganese nitrogen compounds, , metal–organic frameworks, , etc. Different mechanisms have been discovered to be involved in the NTE behavior, including anharmonic phonon vibrations, , charge transfer, , magnetovolume effect, , phase transformation, , and so on. For these NTE materials, different methods have been proposed to control their thermal expansion behavior, such as chemical substitution, multiple material composites, introduction of guest species, and local structure breaking …”