Calcium copper titanate

Calcium copper titanate

Properties
Chemical formula	CaCu3Ti4O12
Molar mass	614.1789 g/mol
Appearance	brown solid
Density	4.7 g/cm^3, solid
Melting point	>1000 °C
Structure
Crystal structure	Cubic
Space group	Im3, No. 204
Except where otherwise noted, data are given for materials in their standard state (at 25 Â°C [77 Â°F], 100 kPa).
Infobox references

Calcium copper titanate (also abbreviated CCTO, for calcium copper titanium oxide) is an inorganic compound with the formula CaCu₃Ti₄O₁₂. It is noteworthy for its extremely large effective relative permittivity of approximately 12,000 at room temperature,^[1] although this value varies widely as a function of particle size.^[2][3] While its intrinsic relative permittivity is about 100, how its large effective permittivity is generated is a matter of debate.^[4]

References

1. Guillemet-Fritsch, S.; Lebey, T.; Boulos, M.; Durand, B. (2006). "Dielectric properties of CaCu3Ti4O12 based multiphased ceramics". Journal of the European Ceramic Society 26: 1245. doi:10.1016/j.jeurceramsoc.2005.01.055.
2. Subramanian, M.A.; Li, D.; Duan, N.; Reisner, B. A.; Sleight, A. W. (2000). "High Dielectric Constant in ACu₃Ti₄O₁₂ and ACu₃Ti₃FeO₁₂ Phases". Journal of Solid State Chemistry 151 (2): 323. Bibcode:2000JSSCh.151..323S. doi:10.1006/jssc.2000.8703.
3. Barber, P.; Balasubramanian, S.; Anguchamy, Y.; Gong, S.; Wibowo, A.; Gao, H.; Ploehn, H. J.; zur Loye, H.-C. (2009). "Polymer Composite and Nanocomposite Dielectric Materials for Pulse Power Energy Storage". Materials 2 (4): 1697–1733. Bibcode:2009Mate....2.1697B. doi:10.3390/ma2041697.
4. Research in Progress 2010, the University of Sheffield.