Negative thermal expansion in cuprite-type compounds: A combined synchrotron XRPD, EXAFS, and computational study of Cu2O and Ag2O

Hexakis(urea-κO)zinc(II) dinitrate at 110 and 250 K: uniaxial negative thermal expansion

“…A famous example is the family of cyanide-bridged nanoporous frameworks (Phillips et al, 2008), where transverse vibrations of the cyanide bridges shorten the metal-metal distances. Other framework materials, such as ZrW 2 O 8 , ZrV 2 O 7 and Sc 2 (WO 4 ) 3 , also show strong negative thermal expansion (Evans, 1999), and a framework-based model has also been used to explain the negative thermal expansion observed in the cuprites Cu 2 O and Ag 2 O (Artioli et al, 2006). However, in organic compounds, negative thermal expansion is seldom observed.…”

Displacive phase-transition of cuprite Ag2O revealed by extended x-ray absorption fine structure

“…In the recent years, silver oxide has received much attention after the discovery of its large negative thermal expansion (NTE) which occurs over a temperature range extending up to 500 K [11][12][13]. Many studies were conducted to identify the vibrational properties responsible for its NTE, establishing a connection with the strong perpendicular vibrations of Ag atoms and, at the same time, ruling out the possibility of explaining NTE by a simple rigid unit modes model [14][15][16][17][18][19][20][21].…”

Derivation of Inter-Atomic Force Constants of Cu₂O from Diffuse Neutron Scattering Measurement

“…Cu 2 O and Ag 2 O show negative thermal expansion below 200 K [6,7]. Ag 2 O is one of the components in AgIAg 2 O-V 2 O 5 super-ionic glass [8]; however, AgICu 2 O-V 2 O 5 super-ionic glass has not been synthesized yet.…”