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Theoretical Prediction: Local distortion of MnO 6octahedronIntensity(Counts)Intensity(Counts)2600240022002000180016001400120010008006004002000200-200 030002800260024002200200018001600140012001000800600400200-200 0200-200 0La 0.69Ca 0.31Mn 0.91Fe 0.09O 3La 0.61Ca 0.39Mn 0.91Fe 0.09O 320 30 40 50 60 70 802θ (deg.)Table I. B-O Bond lengths and angles of BO 6 octahedron in La 0.69 Ca 0.31 Mn 0.91 Fe 0.09 O 3perovskite. B=Mn or Fe locates at (0,0,0). The positions of O (x,y,z) are in unit of latticeconstants, a, b, and c, respectively, where the lattice constants are a = 5.4739(6) ≈ , b=5.4609(6) ≈ and c = 7.7142(8)≈ . The numbers in parentheses are estimated standarddeviations in the least significant digits.atom1 (x,y,z)B-atom1bond lengths(≈ )atom2 (x,y,z)atom1-B-atom2bond angles (°)O I (-.0740,-.0029,.2500) 1.971(11) O II ( .2236, .2714, .0379) 89.3(1.2)O I (.0740, .0029, -.2500) 1.971(11) O II (-.2764, .2286,-.0379) 90.4(1.1)O II ( -.2764, .2286, -.0379) 1.983(56) O I (-.0740, -.0029,.2500) 89.6(1.1)O II (.2236, .2714, .0379) 1.944(58) O I (.0740,.0029,-.2500) 90.7(1.2)O II (.2764, -.2286, .0379) 1.983(56) O II (-.2236,-.2714,-.0379) 91.3(.5)O II (-.2236,-.2714, -.0379) 1.944(58) O II (-.2764,.2286,-.0379) 88.7(.5)
Local structural distortion of MnO 6 octahedronis indistinguishable for XRDï XRD is sensitive to long-range order, rather than local structureï The time scale of XRD is too large, some dynamic informationmay be neglected.ï A local structural probe, such as Mˆ ssbauer Spectroscopy isrequired.
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The Nobel Prize in Physics 1961 Pre
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一、穆斯堡尔效应ï
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原子跃迁和原子核跃
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原子核 γ 射线的有反
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原子核 γ 射线的有反
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穆斯堡尔的实验 ( 一 )
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穆斯堡尔的实验 ( 一 )
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束缚在晶格中的原子
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穆斯堡尔的实验 ( 二 )
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无反冲分数严格按量
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无反冲分数的各向异
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穆斯堡尔核素有 46 种
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穆斯堡尔效应优点穆
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最原始的穆斯堡尔谱
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速度校准295 K α-Fe 标准
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穆斯堡尔谱仪I=5/2I=3/2I=
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穆斯堡尔谱仪探测器
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穆斯堡尔谱仪单道分
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Mˆ ssbauer SpectrometerVariable Te
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Applications of In-field Mˆ ssbaue
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High Temperature Equipment forMˆ s
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高压穆斯堡尔谱装置
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洛仑兹线形穆斯堡尔
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穆斯堡尔谱拟合方法
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穆斯堡尔谱学 (Mˆ ssbaue
Page 59 and 60: 超精细相互作用和穆
Page 61 and 62: 原子核在激发态和基
Page 63 and 64: 在穆斯堡尔实验中 ,
Page 65 and 66: (2) 核电四极矩作用 -
Page 67 and 68: (2) 核电四极矩作用 -
Page 69 and 70: Ⅲ 磁偶极相互作用 :
Page 71 and 72: Ⅳ. 电和磁超精细相
Page 73 and 74: 四极矩劈裂和四极矩
Page 75 and 76: 超精细磁场来源(a) 轨
Page 77 and 78: 超精细磁场来源(c) 费
Page 79 and 80: 超精细磁场来源ï 对
Page 81 and 82: 同质异能移给出的信
Page 83 and 84: Li 离子电池材料Li Fe 2+
Page 85 and 86: 利用四极矩劈裂确定
Page 87 and 88: H Aµ + Cµhf超精细磁场
Page 89 and 90: B(T)6c9d18f18hP(kBar)
Page 91 and 92: Non-magnetic57Fe(3≈ )56Fe(100≈
Page 93 and 94: 转移超精细磁场确定
Page 95 and 96: 研究原子的择优占位
Page 97 and 98: Phase separation in La 0.5 Ca 0.5 M
Page 99 and 100: 六个吸收峰的相对强
Page 101 and 102: 内转换电子穆斯堡尔
Page 103 and 104: 内转换电子穆斯堡尔
Page 105 and 106: Crystal Structure of Ideal ABO 3 Cr
Page 107 and 108: Jahn-Teller effecte gdx 2-y2d z2E J
Page 109: Jahn-Teller effecte gdx 2-y2d z2E J
Page 113 and 114: Quadrupole splitting (∆) and crys
Page 115 and 116: Previous workOur resultsLa 0.69Ca 0
Page 117 and 118: Difficulty in obtaining reliable A
Page 119 and 120: Connection between Jahn-Teller coup
Page 121 and 122: Summaryï It is difficult to detect
Page 123 and 124: Magnetocaloric effect and magnetic
Page 125 and 126: Magnetic Entropy in Magnetic Materi
Page 127 and 128: Giant Magnetic entropy-∆S(J/kg.K)
Page 129 and 130: Magnetic Phase Transition and MCEEv
Page 131 and 132: Field-induced Magnetic Phase Transi
Page 137 and 138: 总结与展望穆斯堡尔
Page 139 and 140: 等加速模式穆斯堡尔
Page 141 and 142: 穆斯堡尔参数给出的
Page 143 and 144: 穆斯堡尔波谱学的应
Page 145 and 146: 结束语穆斯堡尔谱学
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