本資料は、掲載誌(URI)等のリンク先にある学位授与機関のWebサイトやCiNii Dissertationsから、本文を自由に閲覧できる場合があります。
博士論文
国立国会図書館館内限定公開
収録元データベースで確認する
国立国会図書館デジタルコレクション
デジタルデータあり
公開元のウェブサイトで確認する
DOI[10.14943/doctoral.k13361]のデータに遷移します
High-Pressure Synthesis, Crystal Structures and Physical Properties of Perovskites in R2O3-Mn2O3 Systems (R = Rare Earth Elements)
- 国立国会図書館永続的識別子
- info:ndljp/pid/11195086
国立国会図書館での利用に関する注記
資料に関する注記
一般注記:
- Perovskite-type manganese oxide has attracted enormous attention for decades because of its useful interplay between spin, charge, and orbital degrees...
資料詳細
要約等:
- Perovskite-type manganese oxide has attracted enormous attention for decades because of its useful interplay between spin, charge, and orbital degrees...
書店で探す
障害者向け資料で読む
全国の図書館の所蔵
国立国会図書館以外の全国の図書館の所蔵状況を表示します。
所蔵のある図書館から取寄せることが可能かなど、資料の利用方法は、ご自身が利用されるお近くの図書館へご相談ください
書店で探す
障害者向け資料で読む
書誌情報
この資料の詳細や典拠(同じ主題の資料を指すキーワード、著者名)等を確認できます。
デジタル
- 資料種別
- 博士論文
- 著者・編者
- 張, 塁
- 著者標目
- 出版年月日等
- 2018-09-25
- 出版年(W3CDTF)
- 2018-09-25
- 並列タイトル等
- R2O3-Mn2O3系ペロブスカイトの高圧合成と結晶構造と物性
- 寄与者
- 武田, 定忠永, 清治山浦, 一成長浜, 太郎
- 授与機関名
- 北海道大学
- 授与年月日
- 2018-09-25
- 授与年月日(W3CDTF)
- 2018-09-25
- 報告番号
- 甲第13361号
- 学位
- 博士(理学)
- 博論授与番号
- 甲第13361号
- 本文の言語コード
- eng
- 著者別名
- 対象利用者
- 一般
- 一般注記
- Perovskite-type manganese oxide has attracted enormous attention for decades because of its useful interplay between spin, charge, and orbital degrees of freedom. It led to discovery of colossal magnetoresistance, spin-driven multiferroics, and other interesting physical properties. In this study, I investigated the perovskite-type manganese oxide in chemical systems between R2O3 (R = rare earth elements) and Mn2O3. Novel compositions were discovered by applying a high-pressure and high-temperature synthesis method, and those crystal structures and fundamental physical properties were clarified. Chapter 1 introduces the general background, and chapter 2 explains the principal technologies used in this study. Chapters 3 to 5 consist of the main outcomesand the conclusion is drawn inchapter 6. Chapter 3 describes unusual five-fold cation/charge ordering in high-pressure-synthesized RMnO3 perovskites of R = Gd-Tm and Y (at 6 GPa and 1673 K). The R3+, Mn2+, and Mn3+ cations are ordered at the perovskite A site in two separate chains consisting of R3+ and alternating Mn2+ (in tetrahedral coordination) and Mn3+ (in square-planar coordination). Mixed-valent Mn3+/Mn4+ cations are ordered in layeres at the perovskite B site; the ordering can be described as [R3+Mn2+0.5 Mn3+0.5]A[Mn3+Mn3.5+]BO6. The triple cation ordering observed at the A site is very rare, and the layered double B-site ordering is also scarcely seen. RMn3O6 crystallizes in space group Pmmn with a = 7.2479(2) Å, b = 7.4525(3) Å, and c = 7.8022(2) Å for DyMn3O6 (at 213 K), being structurally related to CaFeTi2O6. It appeared that they are non-stoichiometric and can be described as R1-δMn3O6-1.5δ with δ = -0.071 to -0.059 for R = Gd, δ = 0 for Dy, δ = 0.05-0.1 for Ho and Y, and δ = 0.12 for Er and Tm. All of them show complex magnetic behaviors with several transitions, and the magnetic properties are highly sensitive to the δ values. Chapter 4 introduces a quadruple perovskite CeCuMn6O12 synthesized under high-pressure and high-temperature conditions at 6 GPa and about 1670 K. CeCuMn6O12 crystallizes in space group Im-3 above 297 K and R-3 below the temperature with the 1:3 (Mn4+:Mn3+) charge and orbital orders. Unusually compressed Mn3+O6 octahedra found in CeCuMn6O12 closely resembles what was found for the -Q3 Jahn-Teller distortion mode in CaMn7O12. Below approximately 90 K, structural instability results in a phase separation andappearance of competing phases; and below 70 K, two R-3 phasescoexist. CeCuMn6O12 exhibits a ferrimagnetic-like transition below Tc of 140 K, and it is semiconducting with the magnetoresistance reaching -40 % (at 140 K and 70 kOe). Chapter 5 reports orthorhombic rare-earth trivalent manganites RMnO3 (R = Er – Lu), which were self-doped with Mn to form (R0.667Mn0.333)MnO3 compositions. The series was synthesized by a high-pressure and high-temperature method at 6 GPa and about 1670 K from R2O3 and Mn2O3. The average oxidation state of Mn is +3 in (R0.667Mn0.333)MnO3. However, Mn enters the A-site in the oxidation state of +2 creating the average oxidation state of +3.333 at the B site. The presence of Mn2+ was confirmed by hard X-ray photoelectron spectroscopy measurements. Crystal structures were studied by synchrotron X-ray powder diffraction. (R0.667Mn0.333)MnO3 crystallizes in space group Pnma with a = 5.50348(2) Å, b = 7.37564(1) Å, and c = 5.18686(1) Å for (Lu0.667Mn0.333)MnO3 at 293 K, and they are isostructural with the parent RMnO3 manganites. By comparing with RMnO3, (R0.667Mn0.333)MnO3 exhibits enhanced Néel temperatures of about TN1 = 106-110 K and canted antiferromagnetic properties. Compounds with R = Er and Tm show additional magnetic transitions at about TN2 = 10-15 K. (Tm0.667Mn0.333)MnO3 exhibits a magnetization reversal effect with the compensation temperature of 15 K. Chapter 6 provides the general conclusion and future prospects.(主査) 教授 武田 定, 教授 忠永 清治, 客員教授 山浦 一成, 准教授 長浜 太郎総合化学院(総合化学専攻)
- DOI
- 10.14943/doctoral.k13361
- 国立国会図書館永続的識別子
- info:ndljp/pid/11195086
- コレクション(共通)
- コレクション(障害者向け資料:レベル1)
- コレクション(個別)
- 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文
- 収集根拠
- 博士論文(自動収集)
- 受理日(W3CDTF)
- 2018-12-03T16:15:19+09:00
- 作成日(W3CDTF)
- 2018
- 記録形式(IMT)
- PDF
- オンライン閲覧公開範囲
- 国立国会図書館内限定公開
- デジタル化資料送信
- 図書館・個人送信対象外
- 遠隔複写可否(NDL)
- 可
- 連携機関・データベース
- 国立国会図書館 : 国立国会図書館デジタルコレクション