1. Cawley JD (1984) Overview of Zirconia With Respect to Gas Turbine Applications. NASA Technical Paper 2286, March 1984, pp 01–30
2. Cao X Development of new thermal barrier coating materials for gas turbines. Berichte des Forschungszentrums Jülich 4127:1–117
3. Cao XQ, Vassen R, Stoever D (2004) Ceramic materials for thermal barrier coatings. J Eur Ceram Soc 24:1–10
4. Cao XQ, Vassen R, Tietz F, Stoever D (2006) New double-ceramic-layer thermal barrier coatings based on zirconia–rare earth composite oxides. J Eur Ceram Soc 26:247–251
5. Vassen R, Tietz F, Kerkhoff G, Stoever D (1998) New materials for advanced thermal barrier coatings. In: Lecomte-Beckers J, Schuber F, Ennis PJ (eds) Proceedings of the 6th Lie ´ge conference on materials for advanced power engineering (Universite de Lie ´ge, Belgium, November 1998). For- schungszentrum Julich GmbH, Julich, pp 1627–1635