NNR IN RAPIDLY ROTATED METALS By - Nottingham eTheses ...

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Entrance Region f fý % Uniform Gap i i 010 FIGURE 4.3. : The action of a self acting foil bearing f Exit Region 00 r i Foil in Tension
Ip IJýi O 1 t - 1 - 1 p OI ý I ýd Rotor Foil in 1'` I 1 D I'i FIGURE 4.4. : The cylindrical titanium foil bearing rotor (three times size) 1 1 :i Pins
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NNR IN RAPIDLY ROTATED METALS By R.
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I wish to express my thanks to: ACK
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quadrupole relaxation. However theo
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2.3.5 Quadrupole Relaxation 26 (i)
Page 9 and 10:
5.9 Sample Preparation 71 5.9.1 Cup
Page 11 and 12:
1.1 BASIC THEORY -i- CHAPTER 1 INTR
Page 13 and 14: -3- Transforming to the rotating fr
Page 15 and 16: -5- lattice and T2 is the spin-spin
Page 17 and 18: and -7- Vd(t) f(w1)cos w't dw Sao -
Page 19 and 20: -9- where the terms represent the Z
Page 21 and 22: - 11 - If rii = nrij = (Xli + X2j +
Page 23 and 24: - 13 - In powdered samples a weak i
Page 25 and 26: - 15 - This contact term manifests
Page 27 and 28: - 17 - where 0 is the angle between
Page 29 and 30: - 19 - termed pseudo-dipolar. It is
Page 31 and 32: - 21 - the non-secular terms of the
Page 33 and 34: - 23 - to the lattice directly via
Page 35 and 36: - 25 - (2.25), can then be assumed
Page 37 and 38: - 27 - quadrupole moments to produc
Page 39 and 40: - 29 - where En are the Zeeman ener
Page 41 and 42: 3.1 INTRODUCTION - 31 - CHAPTER 3 N
Page 43 and 44: Aý T. B a A"T"B " - 33 - It is a g
Page 45 and 46: (-Ur Ho FIGURE 3.1. : Co-ordinate s
Page 47 and 48: D, (t) = 331 2 + 3YI2 sin 2a 4 - 36
Page 49 and 50: - 38 - X (t) = cos a cos ßp + sin
Page 51 and 52: - 40 - 3.7 THE EFFECT OF ROTATION O
Page 53 and 54: - 42 - observations are inconsisten
Page 55 and 56: - 44 - that it apparently offered n
Page 57 and 58: - 46 - bearings suffer from instabi
Page 59 and 60: SI FIGURE 4.1 SCALE il cm : The con
Page 61 and 62: N to 9 . ýC 8 Ü7 Z w D 06 w ax U.
Page 63: - 50 - The rotors used in this work
Page 67 and 68: - 52 - at rotation speeds around 4
Page 69 and 70: - 53 - the manufacture of which was
Page 71 and 72: PTFE Tape_ FIGURE 4.7 rotors SCALE
Page 73 and 74: 4.4.4 COMMENTS - 55 - For completen
Page 75 and 76: Clamp Pf-£-- SECTION II SECTION 11
Page 77 and 78: 5.1 EQUIPMENT - 58 - CHAPTER 5 EXPE
Page 79 and 80: - 59 - the range ±1 V are digitise
Page 81 and 82: SCALE 3 cm j Cooling Gas ; tainiess
Page 83 and 84: Trensmitter EXL, FIGURE 5.3 : The s
Page 85 and 86: FIGURE $. 4 s The spectrometer prob
Page 87 and 88: Gas Tuning ransmi tter Input Receiv
Page 89 and 90: - 64 - phase can then be set so tha
Page 91 and 92: -66- The transient nuclear signals
Page 93 and 94: - 68 - 5.7.1 THE SOLID ECHO PULSE S
Page 95 and 96: - 70 - sequence may be repeated. In
Page 97 and 98: a° P/'rvu - 72 - p is the resistiv
Page 99 and 100: - 74 - combined with a low viscosit
Page 101 and 102: 6.2 RESULTS AND DISCUSSION - 76 - A
Page 103 and 104: IC 1 I. FIGURE 6.2 : Measured T1 va
Page 105 and 106: - 78 - TABLE 6.1. DEBYE TEMPERATURE
Page 107 and 108: - 80 - TABLE 6.2. RATIO OF TI VALUE
Page 109 and 110: - 82 - TABLE 6.3. DEPENDENCE OF T1
Page 111 and 112: - 84 - provides further evidence th
Page 113 and 114: - 86 - CHAPTER 7 EXPERIMENTAL RESUL
Page 115 and 116:
- 88 - Lorentzian NMR lineshape of
Page 117 and 118:
- 90 - at the top with epoxy glue.
Page 119 and 120:
- 92 - (c) Bulk Susceptibility Effe
Page 121 and 122:
- 94 - aluminium nuclei in the meta
Page 123 and 124:
FIGURE 7.1 : 27A1 F. I. Ds and corr
Page 125 and 126:
- 97 - TABLE 7.1. COMPUTED SECOND A
Page 127 and 128:
- 99 - and Slichter(104) reported t
Page 129 and 130:
- 101 - of this value would be requ
Page 131 and 132:
N JL I F- 0 z J I0 0123456789 ROTAT
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-103- results obtained at a tempera
Page 135 and 136:
T10 ms 3. O 2.5 2'C H 1"C o.. v 234
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0 - 106 - CHAPTER 8 MEASUREMENTS ON
Page 139 and 140:
- 108 - process for vanadium the me
Page 141 and 142:
- 109 - in the same way to the prec
Page 143 and 144:
Qv == , 2 28 kHz -111- which is sli
Page 145 and 146:
- 113 - from Cerac Inc. (USA). The
Page 147 and 148:
- 115 - 8.4.3 SPIN-LATTICE RELAXATI
Page 149 and 150:
tv D Xm =o N O Ul- X- z N O FIGURE
Page 151 and 152:
which gives K=0.048 an ± 0.002 - 1
Page 153 and 154:
- 118 - Lifetime broadening alone g
Page 155 and 156:
- 120 - cannot be spun at low tempe
Page 157 and 158:
- 122 - 11. L. E. Orgel, J. Phys. C
Page 159 and 160:
- 124 - 59. P. J. Randall, Ph. D. T
Page 161 and 162:
- 126 - 101. H. R. Khan, J. M. Reyn
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