CAJ | 학술논문

　　采用溶胶-凝胶法制备Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3陶瓷粉末，以传统陶瓷制备工艺制备Mg元素掺杂的Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3陶瓷．研究MgO掺杂量为1．6％（质量分数）时，MgO固相掺杂和Mg2＋湿化学法掺杂两种不同的掺杂方式对Mg掺杂的Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3陶瓷显微结构及电学性能的影响．研究结果表明，当Mg掺杂量相同时，掺杂方式对Mg掺杂的Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3陶瓷的显微结构和电学特性有显著的影响，相比纯的Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3陶瓷，两种掺杂方式中，Mg2＋湿化学法掺杂相对于MgO固相掺杂，在BSZT陶瓷中的分布更均匀，替位程度更高，所以其对介电常数的影响也相对更大．而MgO固相掺杂相对于Mg2＋湿化学法掺杂明显地促进了陶瓷晶粒的生长，提高了陶瓷的致密性，同时其击穿电场和电阻率也有较大提高．1350℃下烧结的固相MgO掺杂的Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3陶瓷性能较优，介电常数约为590，介电损耗低于0．0005，电阻率为7．78×1013Ω?mm ，击穿场强为6．56 kV/mm ．
　　채용용효-응효법제비Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3도자분말，이전통도자제비공예제비Mg원소참잡적Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3도자．연구MgO참잡량위1．6％（질량분수）시，MgO고상참잡화Mg2＋습화학법참잡량충불동적참잡방식대Mg참잡적Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3도자현미결구급전학성능적영향．연구결과표명，당Mg참잡량상동시，참잡방식대Mg참잡적Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3도자적현미결구화전학특성유현저적영향，상비순적Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3도자，량충참잡방식중，Mg2＋습화학법참잡상대우MgO고상참잡，재BSZT도자중적분포경균균，체위정도경고，소이기대개전상수적영향야상대경대．이MgO고상참잡상대우Mg2＋습화학법참잡명현지촉진료도자정립적생장，제고료도자적치밀성，동시기격천전장화전조솔야유교대제고．1350℃하소결적고상MgO참잡적Ba0．3 Sr0．7 Zr0．18 Ti0．82 O3도자성능교우，개전상수약위590，개전손모저우0．0005，전조솔위7．78×1013Ω?mm ，격천장강위6．56 kV/mm ．
Ba0 .3 Sr0 .7 Zr0 .18 Ti0 .82 O3 (BSZT ) powder was synthesized by sol-gel processing and Mg :Ba0 .3 Sr0 .7 Zr0 .18 Ti0 .82 O3 ceramics with 1 .6% (wt .) MgO doped were prepared by ceramic fabrication traditional technology .The effects of doping method on the characteristics of the microstructure and electric properties of Mg :Ba0 .3 Sr0 .7 Zr0 .18 Ti0 .82 O3 ceramics were investigated experimentally .The Mg element was introduced into the powder by mixing with solid state MgO and by sol-gel processing with Mg2+ , respectively . The results revealed that doping method played an important role in the microstructure and electric properties of Mg :Ba0 .3 Sr0 .7 Zr0 .18 Ti0 .82 O3 ceramics .Compared with pure Ba0 .3 Sr0 .7 Zr0 .18 Ti0 .82 O3 ceramics ,Mg2+ aid distributed more evenly and substituted highlier in the BSZT ceramics than MgO aid ,so it had a great impact on the dielectric constant of ceramics .Moreover , compared to Mg 2+ aid , MgO aid was beneficial to improve the density of the ceramics and the resistivity and breakdown strength were also enhanced . The Mg :Ba0 .3 Sr0 .7 Zr0 .18 Ti0 .82 O3 ceramics doped MgO ,sintered at 1 350 ℃ ,possessed the best electric properties :ε≈590 at 110 M Hz ,tanδ≈0 .000 5 ,ρ≈7 .78 × 1013 Ω?mm ,E≈6 .56 kV/mm .