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Leslie Glasser   Professor  University Educator/Researcher 
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Leslie Glasser published an article in July 2017.
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Leslie Glasser

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(1979 - 2017)
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6
 
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Article 0 Reads 1 Citation Systematic Thermodynamics of Layered Perovskites: Ruddlesden–Popper Phases Leslie Glasser Published: 24 July 2017
Inorganic Chemistry, doi: 10.1021/acs.inorgchem.7b00884
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Perovskite, CaTiO3, is the prototype of an extensive group of materials. They are capable of considerable chemical modification, with the further capability of undergoing structural modification by the intercalation of thin sheets of intrusive materials (both inorganic and organic) between the cubic perovskite layers, to form a range of "layered" perovskites. These changes bring about alterations in their electronic, structural, and other properties, permitting some "tuning" toward specific ends. This paper collects the limited known thermodynamic data for layered perovskites of various chemical compositions and demonstrates by example that the thermodynamic layer values are substantially additive. This additivity may be exploited by summing properties of the constituent oxides, by adding differences between adjacent compositions within a series, or even by substitution of oxides for one another, thus permitting prediction beyond the known range of compositions. Strict additivity implies full reversibility so that the additive product may be unstable and may undergo structural changes, producing materials with new and potentially useful properties such as ferroelectricity, polarity, giant magnetoresistance, and superconductivity.
Article 0 Reads 1 Citation Correct Use of Helmholtz and Gibbs Function Differences, Δ A and Δ G : The van’t Hoff Reaction Box Leslie Glasser Published: 10 March 2016
Journal of Chemical Education, doi: 10.1021/acs.jchemed.5b00925
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Article 0 Reads 4 Citations Crystallographic Information Resources Leslie Glasser Published: 05 November 2015
Journal of Chemical Education, doi: 10.1021/acs.jchemed.5b00253
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Crystallographic information provides the fundamental basis for understanding the properties and behavior of materials. This data, such as chemical composition, unit cell dimensions, space group, and atomic positions, derives from the primary literature–that is, from published experimental measurement or theoretical calculation. Although the major crystallographic journals provide their published data in the form of computer-readable *.cif text files, finding and accessing this material directly is often difficult and certainly time-consuming. On the other hand, we are fortunate to have ready access through the Internet to extensive crystallographic databases, both academic/commercial and free, where the former databases are critically compiled and of the highest quality. The available databases generally specialize, as for inorganic or organic materials, or minerals, etc. The current paper is directed at the occasional user of crystallographic information, and examines methods of searching for and obtaining crystallographic information (mainly inorganic and minerals, but also organic, biological and metallic) from some important free databases; namely: NIMS AtomWorks for inorganics; the Crystallography Open Database (COD) for both inorganics and organics; WWW-Mincryst for minerals; the Protein Databank (PDB) for proteins and nucleic acids; and the Database of Zeolite Structures. An example of a search repeatedly used here demonstrates the changes in information provided from the first X-ray structural determination (of halite by the father-and-son Braggs) to modern representations. The professional researcher is best served by the academic/commercial databases: Inorganic Crystal Structure Database (ICSD); Cambridge Structure Database (CSD) for organics; Pearson’s Crystal Data (PCD) for inorganics; Crystmet for metallic systems, etc. However, free demonstration versions of these important databases provide user introductions and, indeed, usable data for a limited range of materials. A Table provides information and rapid access details for 11 of the major crystallographic databases. This text is directed toward the search for data, but some indication is given as to how the data collected may be used.Keywords: Continuing Education; Graduate Education/Research; Internet/Web-Based Learning; Chemoinformatics; Crystals/Crystallography; Enrichment/Review Materials; X-ray Crystallography; Solids
Article 0 Reads 0 Citations Illusions of Space: Charting Three Dimensions Leslie Glasser Published: 21 October 2014
Journal of Chemical Education, doi: 10.1021/ed5003459
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Article 0 Reads 0 Citations Thermodynamic Consistencies and Anomalies among End-Member Silicate Garnets Leslie Glasser Published: 13 August 2014
Inorganic Chemistry, doi: 10.1021/ic501442g
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Materials with the garnet crystal structure include silicate minerals of importance both in geology, on account of their use in geothermobarometry, and industrially as abrasives. As a consequence of the former, there is considerable published thermodynamic information concerning them. We here examine this thermodynamic information for end-member silicate garnets (some of which are synthetic since not all occur in nature) for consistencies and anomalies, using thermodynamic relations between thermodynamic properties that we have established over recent years. The principal properties of interest are formula volume, heat capacity, entropy, formation enthalpy (from which the Gibbs energy may be obtained), and isothermal compressibility. A significant observation is that the ambient-temperature heat capacities of the silicate garnets are rather similar, whereas their ambient-temperature entropies are roughly proportional to their formula volumes. Evaluation of their Debye temperatures implies that their vibrational contributions to heat capacity are fully excited at ambient temperatures. The relatively small isothermal compressibilities of these garnets is related to the rigidity of their constituent silicate tetrahedra. We here establish additive single-ion values for each of the thermodynamic properties, which may be applied in estimating corresponding values for related materials.
Article 0 Reads 1 Citation Thermodynamics of Inorganic Hydration and of Humidity Control, with an Extensive Database of Salt Hydrate Pairs Leslie Glasser Published: 04 February 2014
Journal of Chemical & Engineering Data, doi: 10.1021/je401077x
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