FUJITA Shigetaka

KAKIMOTO Ken-ichi

MASUDA Yoichiro

English

KAKIMOTO, Ken-ichi

6117

FUJITA, Shigetaka

藤田, 成隆

フジタ, シゲタカ

MASUDA, Yoichiro

増田, 陽一郎

マスダ, ヨウイチロウ

Hachinohe Institute of Technology Repository / 八戸工業大学学術リポジトリ

Ferroelectric SrχBal_χNb206 Synthesized byYAG Laser DepositionKen―ichi KAKIMOTO・,Shigetaka Fu」ITA半半and Yoichiroヽ江ASUDAホ*AbstractTungsten―bronze type tetragonal SrズBal_.Nb206(SBN)ceranlics have been synthesized bypressure―less sintering at l,250°C hrough a Hlixed―oxide rOute, 帝ヽアi h increasing π value in therange fron1 0 3 to 0 6,the Curie temperature shifted to lo、ver temperature,bu  the correspondingmaximum dielectric constant increased  Further, Sr。3Ba07Nb20C thin il ns have been formedby pulsed YAG laser deposition(PLD)technique using a selected SBN bulk target ttrith variouschoices of the deposition parameters  ヽヽ′‐hen Pt―co ted Si ubstrates were used for PLI), apreferential c―axis―ordered structure覇ァas obs rved in the films deposited、v th the energy densityabove 2 0」/cm2,at Substrate temperature above 650°C,and in Oxygen partial pressure belo都/7Pa  The thin nlln demonstrated a rhomboidal P―ぞ hysteresis ioop, nd showed a remanentpolarization(Pr)of31μC/cm2 and COercive neld(どじ)。f128 kV/cmK9ypοrtrs i thin lilm, niobates, tungsten bronze structure, YAG laser ablation, crystalorientation,ferroelectric properties,P―E hysteresis ioop1,  IntroductionStrontium barium niobate SrχBal_メNb206(SBN,025<χ<075)is beheved a sohd solutionin the SrNb206~BaNb206 pseudobinary syste■11)and exhibits a crystal structure closely relatedto the tetragonal tungsten bronze structure(4mm)with a unit cell formula of[(Al)4(A2)2C4B10030]・分 This structure consists of a framework of Nb06 0Ctahedra including direrent typesof interstitial sites: Al site for a coordination number of 15,A2site of 12,C site of 9 and 13 siteof 6.  T、vo of such interstitial sites Al and A2 are generally occupied by Sr/Ba cations,whileC site is vacant  However,Sr/Ba cations in actual SBN materials are considered to be notdistributed regularly at those sites,but seems to forHl various iocal coordination depending onthe χ value.SBN is 、アell known in particular that it exhibits an extremely high electro―opticcoefncient3)and Strong photorefractive effects4,5)aS a Similar degree to BaTi03, SinCe thecrystal is transparent over a wide 、アave length range.  Further, SBN should demonstrateexcenent ferroelectric properties due to the fact that spontaneous polarization occurs along thec―axis of the tetragonal structure and the Curie temperature can be continuously shifted in therange from 50 to 250°C by controlling the χ value.6) various fabrication techniques can be usedfor successful synthesis of SBN.  The methods reported so far include the Czochralski rnethod平成 12年10月13日受理本日本学術振興会未来開拓学術研究プロジェクト・研究員卒本電気電子工学科・教授-61-

Ferroelectric SrxBa1_xNb2O6 Synthesized by YAG Laser Deposition

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Ferroelectric SrxBa1_xNb2O6 Synthesized by YAG Laser Deposition

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