Pub Date : 1987-12-31DOI: 10.1515/9783112485620-006
R. Flagmeyer, B. Schumann
{"title":"Characterization of Epitaxial Group II Fluoride Films on (100)-Oriented GaAs Substrates by Ion Backscattering and Channeling","authors":"R. Flagmeyer, B. Schumann","doi":"10.1515/9783112485620-006","DOIUrl":"https://doi.org/10.1515/9783112485620-006","url":null,"abstract":"","PeriodicalId":17719,"journal":{"name":"July 2019","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1987-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80783602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The behaviour of electrical conductivity of four ferrite semiconductor systems viz., Li-Ni, Mn-Mg, Co-Zn and Ni-Zn having different compositions has been studied in the vicinity of magnetic transformation temperature. Contrary to the predictions of an empirical formula (PARKER's) all the ferrites under investigation have exhibited marked and clear transitions at the Curie Point.
{"title":"Electrical Conductivity of Some Mixed Ferrites at Curie Point","authors":"P. V. Reddy, K. Pratap, T. S. Rao","doi":"10.1002/CRAT.2170220718","DOIUrl":"https://doi.org/10.1002/CRAT.2170220718","url":null,"abstract":"The behaviour of electrical conductivity of four ferrite semiconductor systems viz., Li-Ni, Mn-Mg, Co-Zn and Ni-Zn having different compositions has been studied in the vicinity of magnetic transformation temperature. Contrary to the predictions of an empirical formula (PARKER's) all the ferrites under investigation have exhibited marked and clear transitions at the Curie Point.","PeriodicalId":17719,"journal":{"name":"July 2019","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84059708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Specimens made of Armco iron were electroplated with cobalt and then boronized with 2.2 vol% BCl3 in H2 at 1223 K. The boride layers obtained show the sequence of crystallographic phases which is (Co, Fe)B, FeB, Fe2B, substrate material. Proben aus Armco-Fe wurden mit einer galvanischen Kobaltschicht versehen und mit 2.2 Vol% BCl3 in H2 bei 1223 K boriert. Die dabei entstehenden Boridschichten weisen die Phasenfolge (Co, Fe)B, FeB, Fe2B, Substratwerkstoff auf.
2.2 b . 1223 K纽约2的时好时坏这一层就是黄道夹板。
{"title":"Phase Structure of Boride Layers on Iron Substrates with Electroplated Cobalt Layers","authors":"G. Bochmann, E. Klaus, G. Fritsche, W. Wagner","doi":"10.1002/CRAT.2170220716","DOIUrl":"https://doi.org/10.1002/CRAT.2170220716","url":null,"abstract":"Specimens made of Armco iron were electroplated with cobalt and then boronized with 2.2 vol% BCl3 in H2 at 1223 K. The boride layers obtained show the sequence of crystallographic phases which is (Co, Fe)B, FeB, Fe2B, substrate material. \u0000 \u0000 \u0000 \u0000Proben aus Armco-Fe wurden mit einer galvanischen Kobaltschicht versehen und mit 2.2 Vol% BCl3 in H2 bei 1223 K boriert. Die dabei entstehenden Boridschichten weisen die Phasenfolge (Co, Fe)B, FeB, Fe2B, Substratwerkstoff auf.","PeriodicalId":17719,"journal":{"name":"July 2019","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84858788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A theory of grain size distribution in nucleation and growth reactions described by the KOLMOGOROV model is developed. The distribution of agglomerates of growing and impinging nuclei is explicitely calculated for the two cases of heterogeneous and homogeneous nucleation. The results are compared and discussed with respect to the investigation of the nucleation mechanism in crystallization processes. Es wird eine Theorie der Korngrosenverteilung entwickelt fur Keimbildungs- und Wachstumsprozesse, die durch das KOLMOGOROV-Modell beschrieben werden. Fur die zwei Falle der heterogenen und der homogenen Keimbildung werden die Verteilungen der Agglomerate ineinanderwachsender Keime explizit berechnet. Die Ergebnisse werden verglichen und bezuglich ihrer Anwendung auf die Untersuchung des Keimbildungsmechanismus in Kristallisationsprozessen diskutiert.
{"title":"Grain Size Distribution in the Kolmogorov Model for Nucleation and Growth: Heterogeneous versus Homogeneous Nucleation","authors":"B. Lorenz","doi":"10.1002/CRAT.2170220702","DOIUrl":"https://doi.org/10.1002/CRAT.2170220702","url":null,"abstract":"A theory of grain size distribution in nucleation and growth reactions described by the KOLMOGOROV model is developed. The distribution of agglomerates of growing and impinging nuclei is explicitely calculated for the two cases of heterogeneous and homogeneous nucleation. The results are compared and discussed with respect to the investigation of the nucleation mechanism in crystallization processes. \u0000 \u0000 \u0000 \u0000Es wird eine Theorie der Korngrosenverteilung entwickelt fur Keimbildungs- und Wachstumsprozesse, die durch das KOLMOGOROV-Modell beschrieben werden. Fur die zwei Falle der heterogenen und der homogenen Keimbildung werden die Verteilungen der Agglomerate ineinanderwachsender Keime explizit berechnet. Die Ergebnisse werden verglichen und bezuglich ihrer Anwendung auf die Untersuchung des Keimbildungsmechanismus in Kristallisationsprozessen diskutiert.","PeriodicalId":17719,"journal":{"name":"July 2019","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80723383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A rather simple method of lead salt diode laser fabrication is described. The optimization of the diffusion process forming the pn-junction is especially discussed with regards to the various carrier concentrations of the as-grown crystals. Liquid nitrogen cooled lead salt diode lasers of the described type meet all demands of a laser based air pollution monitoring device. Es wird eine verhaltnismasig einfache Methode der Bleisalzdiodenlaserherstellung erlautert. Insbesondere die Frage der Optimierung des Diffusionsprozesses, der den pn-Ubergang erzeugt, in Abhangigkeit von der Ausgangsladungstragerkonzentration der Kristalle wird diskutiert. Halbleiterinjektionslaser des beschriebenen Typs entsprechen voll allen Anforderungen, die an ein mit flussigem Stickstoff gekuhltes, mit Bleisalzalasern arbeitendes Schadstoffmesgerat gestellt werden.
{"title":"Some Aspects of the Technology of Lead Salt Diode Lasers Used in Gas Monitoring Systems","authors":"J. Tomm, B. Sumpf, K. Herrmann, A. Szczerbakow","doi":"10.1002/CRAT.2170220719","DOIUrl":"https://doi.org/10.1002/CRAT.2170220719","url":null,"abstract":"A rather simple method of lead salt diode laser fabrication is described. The optimization of the diffusion process forming the pn-junction is especially discussed with regards to the various carrier concentrations of the as-grown crystals. Liquid nitrogen cooled lead salt diode lasers of the described type meet all demands of a laser based air pollution monitoring device. \u0000 \u0000 \u0000 \u0000Es wird eine verhaltnismasig einfache Methode der Bleisalzdiodenlaserherstellung erlautert. Insbesondere die Frage der Optimierung des Diffusionsprozesses, der den pn-Ubergang erzeugt, in Abhangigkeit von der Ausgangsladungstragerkonzentration der Kristalle wird diskutiert. Halbleiterinjektionslaser des beschriebenen Typs entsprechen voll allen Anforderungen, die an ein mit flussigem Stickstoff gekuhltes, mit Bleisalzalasern arbeitendes Schadstoffmesgerat gestellt werden.","PeriodicalId":17719,"journal":{"name":"July 2019","volume":"237 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75752174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Investigation of Calcium Distribution in GGG Single Crystals by Means of Radiotracer Methods","authors":"H. Jaskólska, L. Waliś, C. Janusz","doi":"10.1002/CRAT.2170220720","DOIUrl":"https://doi.org/10.1002/CRAT.2170220720","url":null,"abstract":"","PeriodicalId":17719,"journal":{"name":"July 2019","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90330235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Crystal structure determination of polytypes with diffraction methods can be divided into two steps. The first step is the structure determination of the building unit of the polytypic substance (in most cases layers). The second step is the determination of the stacking sequence of the corresponding building units. The stacking can be ordered as well as disordered. Various methods for solving these problems are described. The aim of this paper is to treate these methods from a uniform point of view. Die Kristallstrukturbestimmung mit Beugungsmethoden von Polytypen kann in zwei Schritte eingeteilt werden. Der erste Schritt ist die Strukturbestimmung der Baueinheit der polytypen Substanz (in den meisten Fallen Schichten). Der zweite Schritt besteht in der Bestimmung der Stapelfolge der entsprechenden Baueinheiten. Die Stapelung kann sowohl geordnet als auch fehlgeordnet sein. Verschiedene Methoden zur Losung dieser Probleme sind beschrieben worden. Das Ziel dieser Arbeit ist es, diese Methoden von einem einheitlichen Standpunkt zu behandeln und zu vergleichen.
{"title":"Structure Determination of Polytypes (II)","authors":"P. Sedláček, R. Kuban, K. Backhaus","doi":"10.1002/CRAT.2170220610","DOIUrl":"https://doi.org/10.1002/CRAT.2170220610","url":null,"abstract":"Crystal structure determination of polytypes with diffraction methods can be divided into two steps. The first step is the structure determination of the building unit of the polytypic substance (in most cases layers). The second step is the determination of the stacking sequence of the corresponding building units. The stacking can be ordered as well as disordered. Various methods for solving these problems are described. The aim of this paper is to treate these methods from a uniform point of view. \u0000 \u0000 \u0000 \u0000Die Kristallstrukturbestimmung mit Beugungsmethoden von Polytypen kann in zwei Schritte eingeteilt werden. Der erste Schritt ist die Strukturbestimmung der Baueinheit der polytypen Substanz (in den meisten Fallen Schichten). Der zweite Schritt besteht in der Bestimmung der Stapelfolge der entsprechenden Baueinheiten. Die Stapelung kann sowohl geordnet als auch fehlgeordnet sein. Verschiedene Methoden zur Losung dieser Probleme sind beschrieben worden. Das Ziel dieser Arbeit ist es, diese Methoden von einem einheitlichen Standpunkt zu behandeln und zu vergleichen.","PeriodicalId":17719,"journal":{"name":"July 2019","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81518603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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