Paragraph 1 FePO4 is distinct from other α-quartz isotypes because its A cation is a transition metal. It is studied at different temperature ranged from 294K to 1073K by neutron powder diffraction. At relatively low temperature‚ it adopts the structure of α-quartz‚ which is tetrahedral and shown below. At high pressures‚ a phase change occurs to a more dense octahedral structure‚ which is known as β-phase. The transition temperature is 980K. During the first-order transition‚ discontinuities
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related phenomena due to the interference of light. 0 Time Christiaan Huygens (~1678) considered light as a wave. Using a wave model he was able to explain all the known phenomena of light mentioned above as well as interference and diffraction of light. Constructive interference results in greater amplitude The dark bands are formed when the two waves arriving at the screen are half a cycle out of phase‚ i.e. wave crest combines with wave trough. This is called destructive interference
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She was already skilled in techniques of crystallography and X-ray diffraction‚ because of time researching other carbon compounds at an institute in Paris. At King’s she improved the X-ray diffraction patterns so they made more detailed measurements than ever before (sharpest X-ray diffraction images of DNA in existence). In addition to this Franklin also produced high quality samples of DNA with the molecules aligned in narrow
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with two different cubic and hexagonal structures. The value of TN was reported to be 350 K by Chamberland et al [ ] corresponding to anti ferromagnetic ordering. However‚ Battle et al [ ] concluded TN to be 278 ± 5 K from Massbauer and neutron diffraction studies on 57Fe doped SrMnO3 which value of TN was expected to be little different from that for undoped one. The variation of electrical conductivity with oxygen stoichiometry and the correlation of high temperature stability with structure were
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Lab 3: Hydrogen Spectrum Abstract When white light is viewed through a diffraction grating‚ we can see each component that makes up the light. However‚ when in an excited state‚ a gaseous element produces bright light of specific wavelengths rather than a continuous spectrum of colors. This phenomenon ultimately lead to the Neils Bohr model of the atom in 1913. Introduction In the middle of the 19th century‚ Robert Bunsen and Gustav Kichoff observed that gases emit spectral lines specific
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GROUP B MODEL ANSWER Howard et al.‚ Temperature-induced structural changes in CaCl2‚ CaBr2 and CrCl2: A synchrotron X-ray powder diffraction Phys. Rev. B 72‚ 214114 (2005). DO NOT PLAGIARISE THIS MODEL ANSWER Paragraph 1 The polymorphs involved are the halides in tetragonal rutile (TiO2) structure and the halides in so-called calcium chloride structure. As the name implies‚ the unit cell of halides in tetragonal rutile structure is tetragonal‚ with the lattice parameters a=b≠c and α=β=γ=90o
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Physics 4052 Spring 2004 Y. Kubota K. Wick Project Proposal for Physics 4052 Introduction You must begin to think about a possible experimental project to carry out next semester (Physics 4052). The reason for this is two-fold: first‚ it will introduce you to the process of proposal writing‚ which is an unavoidable and very important part of modern experimentation‚ and second‚ it will enable us to make any necessary plans for procuring equipment. To start you thinking about this process‚
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amount of nitrogen gas adsorbed at (Ps/Po) 0.99. Micropore surface area was obtained via t-plot analysis. The pore size distributions were determined by density functional theory (DFT) model using nitrogen adsorption data. High resolution X-ray powder diffraction spectra were recorded using a Bucker D8 advance diffractometer with Cu–Kɑ radiation operating at 40 kV and 40 mA. The average crystallite size of samples was calculated using Scherer’s formula. Raman spectra of templated carbons were taken in
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CH1105: Materials Science Crystal Structure Assoc/Prof Timothy Tan Office: N1.2 B2-34 B2Tel: 6316 8829 E-mail: tytan@ntu.edu.sg Semester 1‚ 2013-2014 2013School of Chemical and Biomedical Engineering Why study structure of crystalline solids? To understand how atoms assemble geometrically into solid structures To describe the structure of solids To relate material properties to its structure 2 Energy and Packing Dense‚ regular packing Energy typical neighbor bond length typical
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colloidal system consists of two separate phases: a dispersed phase (or internal phase) and a continuous phase (or dispersion medium). A colloidal system may be solid‚ liquid‚ or gaseous. Many familiar substances are colloids‚ as shown in the chart below. As well as these naturally occurring colloids‚ modern chemical process industries utilize high shear mixing technology to create novel colloids. The dispersed-phase particles have a diameter of between approximately 5 and 200 nanometers.[2] Such
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