Magnetic Properties Essay

In order to synthesize our metal complexes, we were able to make both Copper and Ruthenium metals. From this, we combined each metal complex with DMSO by refluxing the compound. The metal complexes were analyzed through their melting point and IR spectroscopy to determine whether the metal bonded to a Sulfur atom or an Oxygen atom of the DMSO. After analyzing the IR spectrum, it was determined that S=O shifted to a lower wavenumber in CuCl2~2DMSO and that S=O shifted to a higher wavenumber in RuCl2~4DMSO.

The Lithium Nickel Manganese oxide battery is still in its experimental stages. It consists of a 25% nickel substituted in a LiMn2O4 spinel. This is because Manganese will have 4 electrons in its valence shell which will avoid the Jahn-Teller distortion caused due to the Mn3+. Due to the oxidation or reduction of Nickel ions which leads to the transfer of electrons which corresponds to electric current. LiNi0.5Mn1.5O4 takes shape in two conceivable crystallographic structures concurring the cationic sub lattice: the face-focused spinel (S.G. Fd3m) named as "cluttered spinel" furthermore, the straightforward cubic stage (S.G. P4332) named as "requested spinel". This addition allows

PHYSICAL CHEMISTRY LABORATORY REPORT (CHE 414L) Department of Chemical Engineering School of Engineering and Architecture Saint Louis University Group No. 12 Members: DEMOT, Judy Ann SOMERA, Randolf P. TIPAYNO, Samantha TORZAR, Precious Imee I. Signatures: ____________________ ____________________ ____________________ ____________________

CHE 131 Experiment 8, General Chemistry I Lab, 131 Quarter 2014-2015, DePaul University. [Online] https://www.d2l.depaul.edu (March 10, 2015)

The enthalpy and entropy of the Rhodamine β-Lactone Zwitterion Equilibrium, in accordance with the first data set were found to be:

Freezing Pt Depression Lab Purpose- To predict compare the actual and theoretical van’t Hoff Factors for three compounds via freezing point depression Day 1 Procedure Fill a beaker ¾ full with ice from the freezer and add ¼ to ½ inch of table salt. Stir until mixed and check that the temperature is ~≤ -8 ºC. Fill a test tube ½ full with tap water Put the temp probe in the test tube and immerse the test tube in the ice-salt bath. Stir the water in the test tube gently with a thermometer while keeping track of the temperature.

During the increase of temperature from 294K to 980K where α-β transition happens, the unit cell structure is trigon α-FePO4 with Fe in the 3a sites, P at the 3b sites and O in the 6c sites (x, y, z). Looking at the structures between trigon α-FePO4 and hexagonal β-FePO4, they have similar symmetry and their symmetrical relationship structure is similar when compared according to the correct respective axes. From 980K to 1073K, the unit cell structure is hexagonal β-FePO4 with Fe in the 3d sites, P at the 3c sites and O in the 12k sites(x, y, z). In hexagonal unit structure, the lattice parameter recordings are as follows: a = b ≠ c with α = β = 90° and γ = 120°. From the graphs, we note that the tetrahedral tilt angle decrease drastically as the transition temperature is reached.

The heavier elements in these groups are harder to research because of their limited availability and therefore are not studied as much as the lighter elements. However, it has been discovered for the heavier elements, relativity begins to stabilize the s and p orbitals while destabilizing the d and f orbitals, which can alter their properties. For an atom, the number of bonds it can make depends on the free valence electrons and the molecular orbitals. So far, a bond order of six has been the largest amount discovered for an atom and contains two sigma bonds, two pi bonds, and two delta bonds. This is true for most of the elements located in group six of the periodic table, tungsten (W) and the lighter elements chromium (Cr) and molybdenum (Mo). However, the largest element in this group, seaborgium (Sg), has considerably different properties and a bond order of four. Researchers used the wave function and density functional theories to analyze the differences in properties of these group six

The physical properties, such as melting point and color, and chemical properties, such as reactivity with a base or acid, can help determine the type of attractive force or chemical bond a solid has. In this lab, four types of chemical bonds were taken into consideration: metallic, ionic, and polar and nonpolar covalent. Metallic bonding is usually found in metals like zinc and is the force of attraction between mobile valence electrons and metal cations while ionic bonding is between two oppositely charged ions. Covalent bonding is another type of chemical bond and occurs between two or more atoms by a sharing of electrons. These bonds can be identified as either polar or nonpolar. While nonpolar bonds have an equal sharing of electron and

Everything is made up of atoms. Atoms are made of electrons, protons, and neutrons. Electrons shape pairs with the magnetism from the two paired electrons exactly cancelling, in almost all materials. Magnets are not paired up like they are in other materials. The electrons then line up, and scatter around the protons, that develop a magnetic field. Therefore, those atoms are microscopic magnets. Then atoms form a line called crystals. A group of these magnetic crystals form a realm of magnetic fields that form a line in the same magnetic direction.

In the Quantum Free Electron Theory the electrons are considered as waves, so the electrons will have much similar behaviour to waves. The temperature is related to the heat capacitance. So each element will have different heat capacitance.

This article describes the interaction of small cobalt clusters with circumcoronene for several geometric configurations based on density functional theory. Results are in agreement with previous published results for similar systems. Moreover, they propose a possible experiment based on measurements of hyperfine interactions that could allow to distinguish the number of cobalt atoms and their positions on coronene. The topic of the manuscript, theoretical methods used, and its applications may be of interest to the audience of JPC. However, it seems to me that manuscript should be revised accordingly to the following points:

The magnetic field for any temperature below the Tc is given by the follwoing eqution:

The two main methods of studying the order and configuration of alloys are X-rays diffuse scattering and Monte Carlo simulations. The former can be used to study individual “sections” (i.e. short range order) but is extensive as individual experiments on single crystals are needed. In order to study the

1Irving, H and Williams, R. J. P, The Stability of Transition-metal Complexes. 1952, J. Chem. Soc., 1953, 3192-3210 DOI: 10.1039/JR9530003192 http://www.ciens.ucv.ve/eqsol/Inorganica%20II/articulo2.pdf (assessed 20 Oct 2014)