Rc Ropp

Rc Ropp
Rutgers, The State University of New Jersey | Rutgers · Department of Chemistry (Newark)

PhD

About

77
Publications
34,610
Reads
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1,234
Citations
Citations since 2016
7 Research Items
338 Citations
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
Additional affiliations
June 1971 - June 1981
Rutgers, The State University of New Jersey
Position
  • Staff Member
March 1963 - December 1967
Westinghouse Electric Company (1968-70)
Position
  • Consultant to Chief Engineer

Publications

Publications (77)
Book
Full-text available
Book
This book is an ongoing manuscript with each chapter being added as it is completed. It is meant to be used by readers who wish to know the complete review of alkali metalloids and the alkali compounds known to date (when the manuscript is finished).
Preprint
Full-text available
This Encyclopedia of the alkali elements lists all of the known compounds to date in a form easy to compare Li to Cs. It begins with intermetallics and now the oxyides (all 100+) have just been finished. Next- sulfur. Data is meant to be used as needed in any way. R C Ropp
Book
Full-text available
This book was written in order to describe how the original, basic ideas relating to communication, numbering and writing, as developed by Mankind, evolved into our present day complexity wherein the computer (in many forms) has become ubiquitously entrenched in our modern-day living. This is manifest in the universal usage of “wireless” portable t...
Article
Full-text available
This manuscript describes a new type of glass whose serendipitous experimental observation several years ago intrigued the author. He later resumed work that culminated in this manuscript. Phosphate glasses are notorious in their susceptibility to degradation by water in any form. It has been established that alkaline earth orthophosphate glasses,...
Data
Full-text available
Experiment Findings
Full-text available
Research
Full-text available
This book is a free but copy-righted edition.
Book
Full-text available
Preface This book was written in order to describe how the original, basic ideas concerning communication, numbering and writing, as developed by Man, evolved into our present day complexity wherein the computer (in many forms) has become ubiquitously entrenched in our modern-day living. This is manifest in the universal usage of "wireless" portabl...
Data
Presents the reasons why a chemical stimulation of oil wells was developed
Data
ABSTRACT Generation of hydrocarbon gas volumes from crude oil, when performed under laboratory conditions, using a proprietary chemical formulation, follows a positive asymptotic, exponential law. This occurs when the volumes of reacting chemical and crude oil are about equal. When crude oil volume is in excess (a condition usually encountered in...
Book
Full-text available
These are topics to be found in Book
Book
Full-text available
Presenting a concise summary of all known alkaline earth inorganic compounds and their properties, Encyclopedia of the Alkaline Earth Compounds will be an excellent reference for students and researchers who wish to determine what is known about a specifi c compound. Encyclopedia of the Alkaline Earth Compounds is a compilation describing the physi...
Book
Full-text available
I wrote this book to document what is known concerning the Past, some of my experiences in the Present and what may happen in the Future.
Book
Full-text available
This book addresses the factors that involve why and how glass fractures. If you wish to receive a paper-back copy, send a check for $ 149.00 (USD) to: Dr. R C Ropp - 138 Mountain Ave - Warren, NJ, 07059-5260 - USA (This includes postage and Handling) For a .pdf copy on a 2.0 GB Flash-Drive memory stick, send $ 69.00 to the above address. Include...
Article
Synthesis of LaAl11O18 by the solid-state reaction of La2O3 and Al2O3 occurs in two stages, i.e. LaAlO3 forms immediately at 1450°C in air but LaAl11O18 formation is very slow and requires up to 141 days. First-order kinetics were observed and an activation energy of 118±4 kcal was calculated. Formation of LaAl11O18 depends on external O2-gas parti...
Article
Of the two formulas previously reported for the compound on the alumina-rich side of the system La2O3-Al2O3, present experimental results indicate that LaAl11 O18 is correct. This compound melts congruently at ∼2000°C and has a hexagonal structure with lattice parameters of a0= 5.561± 0.007 Å and c0=22.041± 0.004 Å. Compositions fired at 1650° show...
Book
The point defect-mechanisms of solid state reactions-particle size-growth of single crystals-design of phosphors
Chapter
This chapter explores the reaction of solids that includes the mechanisms involved when solids form by reaction from constituent compounds. The chapter also describes some methods of measurement and how one determines extent and rate of the solid state reaction actually taking place. It shows how the presence and/or formation of point defects affec...
Chapter
This chapter deals with the phase chemistry of solids. To understand the solid state, one must first understand how matter exists. The best way to understand phase changes is to examine those observed with water, i.e.- those involving the molecule, H2O. Reversible transformations between the three forms of matter are known as “Changes of State.” In...
Chapter
This chapter examines how the solid actually occurs in Nature and explains the defects of solids. Chemical properties of the solid are not determined solely by the structure but also by the nature of chemical composition and in particular by any defects that are present. Some defects are related to the entropy of the solid. Entropy effects are gene...
Chapter
This chapter explains the structure of solids and describes how to determine the structure of solids. It describes how atoms or ions fit together to form a solid phase. The chapter reviews how one goes about actually determining the structure of a given solid. There are two factors that are needed to be considered: (1) what are the steps required i...
Chapter
This chapter delineates growth of crystals. Many of the devices that are used on a daily basis employ a single crystal element as the heart of the mechanism. A good example is the “quartz crystal” watch. A quartz crystal is made to vibrate under an applied voltage. Its vibrations are coupled to a sensing circuit and translated into seconds, minutes...
Book
Solid State Chemistry is a general textbook, composed for those with little background knowledge of the subject, but who wish to learn more about the various segments of solid state theory and technology. The information is presented in a form that can easily be understood and will be useful to readers wishing to build on their own store of knowled...
Article
Absorption and fluorescene spectra and fluorescence lifetimes of Nd3+ ions were measured for the following polymeric metaphosphate glasses: [M(PO3)2]n, where M = Mg, Ca, Sr, Ba, Zn, Cd, and Al(PO3)3. Judd-Ofelt intensity parameters for f-f transitions were derived from the integrated absorption spectra and used to calculate the spontaneous emission...
Article
Die zu LaAlu O18 führende Festkörperreaktion zwischen La2O3 und Al2O3 läuft in den Stufen A und B ab.
Article
Für die im System La2O3-Al2O3 im Bereich 93-94 mol-% Al2O3 auftretende Verbindung wird die korrekte Formel LaAl11O18 (F. ca. 2000°C) aufgestellt.
Article
Of the two formulas previously reported for the compound on the alumina-rich side of the system La//2O//3-Al//2O//3, present experimental results indicate that LaAl//1//1O//1//8 is correct. Compositions fired at 1650 degree showed invariant powder diffraction patterns whereas those fired at 1450 degree C exhibited X-ray patterns which varied both i...
Article
The chemistry of vanadium in solution has been investigated over the entire pH range, with special emphasis on rare earth precipitates. Whereas prior investigators were confronted with an instability range between pH 5.5–7.5 due to precipitation of hydrous V2O5, the present work did not encounter such a barrier. Thus, the complete pH range could be...
Article
The overlap, or separation, of intershell (4f-5d) and charge transfer (CT) spectra of trivalent rare earths depend upon properties of the host, not upon the rare earths themselves.
Article
There are three possible energy processes involving change in electronic states for the trivalent rare earths in oxygen-dominated hosts. These are intrashell (4f-4f), intershell (4f-5d), and charge transfer (CT) transitions. It is possible to differentiate between these processes on the basis of band width and number of components present even thou...
Article
Abweichungen von der Vegardschen Regel bei YVO4 -YPO4 sind eine Folge der Nebenreaktionen, die bei der Herstellung der festen Lösung auftreten.
Article
Previously reported deviations from Vegard's law for the YVO4-YPO4 system have now been demonstrated to be due to side reactions occurring during the preparation of the solid solution. Several methods of preparation were investigated and their solid solution yields were evaluated. An aqueous coprecipitation method offers a 100% yield. Using precipi...
Article
When YVO4 melts at 1810°C, it decomposes to form YVO3, a black semi-conducting compound. Between about 1500°C and its melting point, YVO4 also reacts to form Y8V2O17 plus V2O5. The melt actually consists of a ternary system whose composition changes with time. Reoxidation of YVO3 to YVO4 can be accomplished below the melting point by annealing in o...
Article
LaVO4 has been found to be dimorphic, the crystalline form depending upon the mode of preparation. Precipitation from solution yields a tetragonal form, isomorphous to the other rare earth vanadates with a0 = 7·441 and c0 = 6·503. Heating the lanthanum precipitate above approximately 300°C converts tetragonal LaVO4 to its well known monoclinic form...
Article
The calculated free-ion energy levels of the rare earths, in the form of Grotrian diagrams, have been compared with the experimental values for the phosphates, borates, titanates, and oxides. Compounds were used in pure form. The resolution of the powder reflectance data was more than sufficient to resolve the Stark components. Crystal field effect...
Article
The luminescent emission spectra of YPO4:Ce phosphors are shown to depend on method of preparation. The differences in spectra are explained in terms ofstructure and stoichiometry affecting the symmetry of the Ce+3 site.
Article
A crystalline optical convertor, adapted to improve the efficiency of a resonant cavity of a laser cavity system, includes: neodymium ions used as lasing ions, a host for the neodymium ions which is used as a laser rod, convertor ions, and a crystalline convertor host. The convertor ions are selected from the group consisting of trivalent dysprosiu...
Article
It is possible to obtain resolution of the order of 1–2 Å in the reflectance spectroscopy of powders by carefully controlling the experimental measuring techniques. One can then identify; optically, broad bands and narrow bands of the rare earths as being upper energy states and unperturbed 4f transitions. It is even possible to show various degree...
Article
Because does not absorb at wavelengths longer than about 2000Aå, the rare earth phosphates, , where Ln is any rare earth (other than La, Pm, or Lu), represent an ideal system for the study of rare earth absorption. Reflectance spectra of all compounds are presented for wavelengths between 2000 and 8000Aå. Only and produce luminescence when excited...
Article
Spectra of some rare earth activated phosphors, where may be Y, Gd, or La, are presented. The most efficient phosphors, particularly in the matrix, are those activated by Sm⁺³, Eu⁺³, and Dy⁺³. It is shown that has an output efficiency comparable to commercial phosphors. , when properly prepared, has an output intensity exceeding that of . The major...
Article
Dysprosium- and samarium-activated yttrium vanadates, when properly prepared, are phosphors with constant quantum yield over the range of 2000 to 3450 Å. Correlation of stoichiometry and reflectance is given and an explanation of the possible energy processes is also presented.
Article
When excited by the proper wavelength, Tb+3 in Y2O3 transfers some of that energy to Eu+3 centers which subsequently emit 6125-Å light. The actual mechanism involves an initial high-energy excitation state (a broad band, indicating a perturbed activator state) which relaxes to one of the 5Dj states, from which emission occurs in about 1.0 msec. The...
Article
A detailed study of a rare-earth oxide ternary system activated by Eu+3 has shown that these phosphors are host-sensitized. There are matrix excitation bands present as well as a band attributed to perturbation of excited states of Eu+3. An exciton mechanism is believed responsible for the matrix band and the field perturbation of the excited Eu+3...
Article
A study of rare earth oxide phosphors activated by rare earths revealed that fluorescence occurs only in those matrices where the cation possesses no unpaired electrons. The fluorescent intensities of the rare earth activators were divided into three categories, strong, medium, and weak, each having a characteristic excitation spectrum. (auth)
Article
Spectral properties of the alkaline earth pyrophosphates and a condensed strontium phosphate, all activated by copper, are described. Of the pyrophosphates, only α-Ca2PaO7, β-Ca2P2O7, and δ-Ba2P2O7 produce moderately intense emission when activated by copper. In the condensed phosphate systems, only Sr5(P3O10)2:Cu produces intense luminescence. An...
Article
A study of the utilization of CdCl2 in the formation of Cd5Cl(PO4)3: Mn revealed that the quantum efficiency of luminescence can be related to the amount of incorporated chloride. The absorption site probably involves a charge transfer complex between a chloride on the Co axis and one of the neighboring cadmium atoms.
Article
The thermal analyses of several phosphor raw materials are given to ; illustrate the methods as well as to show limitations and means of circumventing ; experimental difficuIties. The data show that a combination of differential ; thermal analysis and thermogravimetric analysis is often needed to establish ; reaction temperatures and products of fo...
Article
The x-ray powder patterns of 10 cadmium ortho- and pyrophosphates are reported for their value in the identification of phosphate materials and in the elucidation of the reactions of the cadmium phosphates. Three condensed phosphates obtained from thermal treatment of monobasic cadmium orthophosphate were also isolated, but their chemical nature re...
Article
Copper may be determined in solution by adsorption on silver-activated zinc sulfide, followed by heating to induce copper activation of the phosphor. The intensity of the induced green fluorescence, observed along with the original blue fluorescence, is directly proportional to the copper content and may be compared to standards containing known am...
Article
The phosphate, Cd5H2(PO4)4(H2O) 4, is stable over wide concentration, temperature and pH limits, converting in the presence of ammonia at pH 7.5 or above to one of two forms of cadmium ammonium phosphate hydrate, depending on ammonia concentration. In contrast to earlier results, no other basic phosphates could be precipitated, although cadmium hyd...
Article
The preparation and properties of the Group II metal pyrophosphates activated by tin are described. It is shown that the fluorescent emission is strongly dependent on the matrix shifting toward higher wave lengths with increasing size of the cation of the pyrophosphate. Excitation and emission spectra of many of the phosphors are given. The most us...
Article
A compound shown to be CdO2 has been prepared and some of its properties are given. The crystal structure of this material has been studied by powder diffraction methods. Patterns were indexed on the basis of a cubic pyrites-type lattice with the cadmium atoms occupying the fee positions. A value for a0 of 5.313 ± 0.003 Å. and an oxygen-oxygen pero...
Article
The x-ray powder patterns of 12 strontium phosphates have been reported for their value in the identification of phosphate materials and in the elucidation of the reactions of strontium phosphates. Chemically, strontium phosphates are similar in their reactions to the calcium phosphates.
Article
A study of the strontium phosphates has disclosed the existence of two crystalline modifications of dibasic strontium phosphate. These modifications behave similarly in the presence of water; but on firing to convert to the pyrophosphates, they follow separate reaction paths dependent upon the original crystal structure Analogies to the crystal str...

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Projects (3)
Project
This is the complete First Part
Project
A new type of glass is described and delineated. Chemical preparation requires adherence to a new set of rules to obtain a glass resistent to attack by water. Data in this manuscript shows that such a polyphosphate glass is nearly inert when exposed to boiling water for 96 hours.