摘要
采用溶胶-凝胶法在醋酸溶液体系中制备了未掺杂和掺Mn的钛酸锶钡的凝胶和粉末,采用DSC和XRD研究了Mn掺杂对Ba0.7Sr0.3Ti1-xMnxO3(BST)热演变及相组成的影响。结果表明:Mn掺杂强烈影响BST体系的热演变过程特别是晶化过程,由未掺杂BST体系的双相变过程逐渐变成单相变过程;在相同热经历状况下,Mn掺杂BST体系的晶化反应充分完全,BST相结晶性良好;Mn掺杂增大BST晶体(110)晶面间距并细化晶粒尺寸。掺Mn(x=0.10)的BST体系经210～340℃热解2.5h,750℃晶化退火0.5h后可以得到单一的BST相。
Gels and powders of Ba0.7Sr0.3 （Ti1-xMnx）O3 （BST） were prepared by sol-gel technique. Effect of Mn-doping on the pyrolysis evolution and phase constitutes of BST was investigated using DSC and XRD. Results showed that the Mn-doping led to a remarkable change of the crystallizing process of BST, from a double phase-transformation without dopant to a single phase-transformation with Mn-dopant. The crystallizing process of the Mn-doped BST powders proceeded more completely and the crystallinity of BST phase became better with the same thermal history. Mn-doping resulted in an increase in the plane spacing of （110） of BST crystal and a refinement of grain size of BST powder. And nano-scaled single phase BST could be obtained when the level of Mn dopant is 0.10 with a proper fabrication process determined ：sample was first pyrolized at a temperature from 210 ℃ to 340 ℃ for 2.5 hours and then annealed at 750 ℃ for 0.5 h.
出处
《兵器材料科学与工程》
CAS
CSCD
2009年第1期78-82,共5页
Ordnance Material Science and Engineering
