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选取Ti~(4+)对PbZrO_3进行掺杂改性,采用溶胶-凝胶技术制备了PZ及PZT干凝胶粉。XRD结果表明,单一钙钛矿型PZ的煅烧温度为900℃,而单一钙钛矿型PZT(95/5)的煅烧温度为750℃。SEM观察发现,经900℃煅烧,PZ已被烧结成陶瓷,且晶界明显。而经750℃煅烧,PZT(95/5)的粒径约为150 nm。TEM和EDS结果表明,所制备的粉体为单一钙钛矿型的PZT(95/5)反铁电纳米粉。DSC-TGA结果表明,由于Ti~(4+)的添加,形成大量Ti~(4+)羟基类物质。Ti~(4+)羟基类物质的分解,放出了大量的热,促进了PZT(95/5)的结晶。
Ti 4+ was selected to modify PbZrO 3, and PZ and PZT dry gel powders were prepared by sol-gel technique. The XRD results show that the calcination temperature of a single perovskite PZ is 900 ℃, while the calcination temperature of single perovskite PZT (95/5) is 750 ℃. SEM observation showed that after calcination at 900 ℃, PZ has been sintered into ceramic, and the grain boundaries are obvious. When calcined at 750 ℃, the particle size of PZT (95/5) is about 150 nm. TEM and EDS results show that the prepared powder is a single perovskite PZT (95/5) antiferroelectric nanopowder. DSC-TGA results show that due to the addition of Ti ~ (4 +), a large amount of Ti ~ (4+) hydroxyls are formed. Ti ~ (4 +) hydroxyl substances decomposition, release a lot of heat, and promote the crystallization of PZT (95/5).