文摘
The search for high piezoelectric and electromechanical properties near morphotropic phase boundaries (MPB) in lead-free ceramics has attracted considerable interest. The MPB can be obtained in the composition-temperature phase diagram by combining stabilized rhombohedral (R) and tetragonal (T) ends, which possess cubic (C) to R or C to T transitions, respectively. The R-end is usually realized by doping ions class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0009.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=9c96d60d5277a6f56d11ec2c87eef5e2" title="Click to view the MathML source">Zr4+class="mathContainer hidden">class="mathCode">, class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0010.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=1e64e25b6ecda075ac705da8f8e2862d" title="Click to view the MathML source">Hf4+class="mathContainer hidden">class="mathCode"> or class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0011.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=1fb40c1a3f45f92a4435405f9de5f7fd" title="Click to view the MathML source">Sn4+class="mathContainer hidden">class="mathCode"> at the class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0012.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=09fbab13e38a2dc9a07d4f16c96b4625" title="Click to view the MathML source">Ti4+class="mathContainer hidden">class="mathCode"> site, whereas the T-end can be generated by class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0013.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=c814492dfd1eb9f56d067ae495440f0d" title="Click to view the MathML source">Ca2+class="mathContainer hidden">class="mathCode"> doped at the class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0014.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=4a8568baae410be5d5b8ad989faa1027" title="Click to view the MathML source">Ba2+class="mathContainer hidden">class="mathCode"> site of class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0015.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=dcfcd2127dfaacc6a4b8820446a918c8" title="Click to view the MathML source">BaTiO3class="mathContainer hidden">class="mathCode">. Our recent computational work (Phys. Rev. B. 93, 144111, 2016) showed that class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0016.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=bd045991cb0ea61d7e2d8dfacb85f791" title="Click to view the MathML source">Cd2+class="mathContainer hidden">class="mathCode"> doped class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0017.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=f23f9ef486a37c95d15d87d9b464dcda" title="Click to view the MathML source">BaTiO3class="mathContainer hidden">class="mathCode"> can be considered as a potential T-end. In the present study, we synthesized class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0018.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=1ce20fd0b2ef4a55c230b333c94e32f4" title="Click to view the MathML source">(Ba1−xCdx)TiO3class="mathContainer hidden">class="mathCode"> ceramics to investigate the effects of class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0019.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=d278aa445919e6e619021258638380c7" title="Click to view the MathML source">Cd2+class="mathContainer hidden">class="mathCode"> on the phase transition, dielectric, ferroelectric and piezoelectric properties of the ceramics. Although our results show that class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0020.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=4decbb60ba24ee7668604dd40b542ebf" title="Click to view the MathML source">Cd2+class="mathContainer hidden">class="mathCode"> fails to stabilize the T phase, i.e., the transition temperatures vary little with class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0021.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=0109223bd9166e64c83c62b861bcc172" title="Click to view the MathML source">Cd2+class="mathContainer hidden">class="mathCode"> concentration, the electrical properties are found to be optimized for class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318168&_mathId=si0022.gif&_user=111111111&_pii=S0272884216318168&_rdoc=1&_issn=02728842&md5=817b074b3d70ba331de8a2f8e05fea19" title="Click to view the MathML source">Cd2+class="mathContainer hidden">class="mathCode">% of 5%. The optimization of the properties is related to the microstructural features including grain size and sample density.