Structual and Dielectric Properties of Pb(Zr0.53Ti0.47)O3 Thin Films Grown on LaNiO3 Buffered Si Substrates
Ferroelectric Pb(Zr0.53Ti0.47)O3 thin films with thickness of around 800 nm were prepared on LaNiO3 (LNO) buffered SiO2/Si substrates by sol-gel method. The LNO buffer layer serves as the bottom electrode and the template for growing PZT thin films with preferred orientation. The (110)-textured PZT thin films can be obtained on 250 nm-thick LNO buffered SiO2/Si substrates. Upon using the LNO buffer layer, the annealing temperature of the PZT films is lowered to 600degC. Our results indicate that PZT thin films prepared on LNO buffered Si substrates have good structural and dielectric properties for sensor and actuator applications.
Combined annealing temperature and thickness effects on properties of PbZr0.53Ti0.47O3 films on LaNiO3/Si substrate by sol–gel process
Abstract PbZr 0.53 Ti 0.47 O 3 (PZT) films with different thickness were deposited on LaNiO 3 -coated Si substrate by modified sol–gel process. The thickness effect on structure and properties of PZT films annealed at different temperature have been investigated. Single perovskite-phase PZT films with preferred [1 0 0] orientation and denser columnar structure were obtained, when annealed at a lower temperature of 600 °C, whereas a higher annealing temperature of 700 °C resulted in [1 1 0] preferred orientation and porous structure. The dielectric and ferroelectric properties of PZT films annealed at different temperature were evaluated systemically as a function of thickness, and the dielectric and ferroelectric properties of PZT films were found to greatly depend on both thickness and annealing temperature.
Comparative study of the molecular species of chloropropanediol diesters and triacylglycerols in milk fat
In an effort to establish the origin of the fatty acid esters of 3-chloropropanediol, which recently have been isolated in small amounts from goat milk, we compared the molecular species composition of the chlorohydrin diesters and of goat milk triacylglycerols. The chloropropanediol diesters were found to be composed of molecular species containing C10−C18 fatty acids and corresponded closely in carbon number to those calculated for the long chain sn-1,2-diacyl-glycerol moieties of goat milk triacylglycerols. The molecular species of goat milk total triacylglycerols contained C4−C18 fatty acids. It is suggested that triacylglycerols and chloropropanediol diesters are derived from the same pool of long chain fatty acids. A molecular distillate of bovine milk fat did not contain chloropropanediol diesters, while the available samples of human milk fat were shown to contain alkyldiacylglycerols as the major components of a neutral lipid fraction corresponding in polarity to the chloropropanediol diesters.