Chemischer Transport intermetallischer Phasen. 2 [1]. Der chemische Transport von Mischkristallen im System Co/Ni

Chemical Vapor Transport of Intermetallic Systems. 2. Chemical Transport of Co/Ni-mixed Crystals By means of chemical transport reaction it is possible to prepare Co/Ni-mixed crystals in a wide range of percentage composition between 5 and 75 weight % Nickel. This is possible using a 3-zone-oven. Thermodynamic considerations allow to understand the experiments.     

Chemischer Transport intermetallischer Phasen. 4. Der chemische Transport von Co5Ge3 und CoGe

Chemical Vapor Transport of Intermetallic Systems. Chemical Transport of Co₅Ge₃ and CoGe By means of transport reaction (900 → 700°C, Iodine as transport agent) pure Co₅Ge₃ or Co₅Ge₃ with CoGe as a by-product can be prepared. Thermodynamic calculations allow to understand the reaction semiquantitatively.     

Der Chemische Transport von Cr(Ge) (Mischkristall), Cr3Ge,Cr5Ge3, Cr11Ge8, CrGe,Cr11Ge19 und Ge(Cr) (Mischkristall)

Chemical Vapor Transport of Intermetallic Systems. Chemical Transport of Cr(Ge) (Mixed Crystal) Cr₃Ge, Cr₅Ge₃, Cr₁₁Ge₈, CrGe, Cr₁₁Ge₁₉ and Ge(Cr) (Mixed Crystal) All intermetallics in the Cr/Ge-system can be prepared by CVT-methods. The composition of the deposited crystals is influenced first and foremost by the composition of the starting material. Thermodynamic calculations allow to understand the process qualitatively.     

Der chemische Transport von Kupfergermaniden und Kupfersiliciden

Chemical Vapor Transport of Intermetallic Systems. 9 Chemical Transport of Copper Germanides and Copper Silicides By means of chemical vapor transport using iodine and bromine as transport agents in the system Cu/Ge the compounds Cu₃Ge (ϵ and ϵ₁), Cu₅Ge (ζ) and copper‐rich mixed crystals Cu(Ge) have been prepared in form of single crystals. Thermodynamic considerations allow to understand the CVT process, especially the unexpected low temperatures. Copper silicides can be prepared under similiar conditions. They are extremely disordered. Their crystallographic characterisation was therefore impossible.     

Der chemische Transport von Ni3Ge,Ni5Ge3, Ni(Ge)-Mischkristall,CoSn, Co3Sn2, Cu41Sn11 (δ-Phase), Cu10Sn3 (ζ-Phase) und Cu(Sn)-Mischkristall

Chemical Vapour Transport of Intermetallic Systems. 7. Chemical Transport of Ni₃Ge, Ni₅Ge₃, Ni(Ge)-mixed Crystal, CoSn, Co₃Sn₂, Cu₄₁Sn₁₁ (δ-phase), Cu₁₀Sn₃ (ζ-phase), and Cu(Sn)-mixed Crystals By means of GaI₃ as transport agent some intermetallics in the Ni/Ge- and Co/Sn-system can be prepared by CVT-methods. Using Iodine Cu–Sn-compounds can be deposited in a similiar way.     

Chemischer Transport intermetallischer Phasen Der chemische Transport von Mischkristallen im System Cu/Ag

Chemical Vapor Transport of Intermetallic Systems Chemical Transport of Cu/Ag-mixed Crystals By means of chemical transport reaction it is possible to prepare Cu-rich and Ag-rich mixed crystals in the Cu/Ag system. The composition of individual deposited crystals was different. Mass-spectrometric analysis of the gas-phase above CuI/AgI has shown the formation of CuAg₂I_3,g und Cu₂AgI_3,g. Thermodynamic computations explain the formation of crystals as well as the reaction conditions.     

Chemischer Transport intermetallischer Phasen. 3 [1]. Der chemische Transport von Mischkristallen im System Mo/W

Chemical Vapor Transport of Intermetallic Systems. 3. Chemical Transport of Mo/W-mixed Crystals Mo/W-mixed crystals can be prepared by means of chemical vapor transport with HgBr₂ (1000°C→900°C). It is known [2] that the transport reaction of tungsten begins hours or even days after starting the experiment. This is the reason for the unusual composition of deposited crystals: EDX-analysis show them to have a Mo-rich nucleus and a W-rich shell.     

Chemischer Transport fester Lösungen. 20 [1] Der Chemische Transport von Mischphasen in den Systemen CdS/CdTe und CdSe/CdTe

Chemical Vapor Transport of Solid Solutions. 20, Chemical Vapor Transport of Mixed Phases in the Systems CdS/CdTe and CdSe/CdTe By means of CVT methods using iodine as transport agent (900 → 800 °C) in the systems CdS/CdTe and CdSe/CdTe mixed crystals could be prepared. The system CdS/CdTe shows a broad miscibility gap. Sulfur rich mixed crystals as well as tellurium rich ones could be prepared. The system CdSe/CdTe shows complete miscibility for all Se/Te ratios. In both systems congruent transport has been observed.     

Der Chemische Transport von Kupfer/Gallium‐ und Silber/Gallium‐Phasen

Chemical Vapor Transport of Intermetallic Systems. 10. Chemical Transport of Copper/Gallium and Silver/Gallium Phases The solid solution of gallium in copper and the ζ‐ and the γ‐phase can be prepared by CVT‐methods using iodine as transport agent. The solid solution of gallium in silver and the ζ‐phase and the ζ′‐phase can also prepared by CVT‐methods. Thermodynamic calculations allow to understand why these phases can be prepared by this manner.     

Der chemische Transport von Titangermaniden

Chemical Vapor Transport of Intermetallic Systems. 8. Chemical Transport of Titaniumgermanides By means of chemical vapor transport using iodine as transport agent in the System Ti/Ge the compounds TiGe₂ and Ti₅Ge₃ have been prepared in form of single crystals. Unexpectedly the phase Ti₆Ge₅ could not be deposited from the vapor phase. The experiments show in contrast to the literature that Ti₆Ge₅ is at 700 °C thermodynamic unstable. Chemical vapor transport is a suitable method to determine coexistence conditions of intermetallic compounds.     

Der Chemische Transport von Mischkristallen im System NiO/ZnO

Chemical Vapor Transport of Solid Solutions. 2 Chemical Transport of NiO/ZnO‐Mixed Crystals By means of chemical vapor transport using HCl as transport agent (900 → 750 °C) it is possible to prepare ZnO‐rich and NiO‐rich mixed crystals in the system Zn/Ni/O. The mixed‐crystals are homogeneous. Thermodynamic calculations allow to understand the experiments.     

Der Chemische Transport von Mischkristallen im System FeS/MnS/ZnS

Chemical Vapor Transport of Solid Solutions. 7. Chemical Vapor Transport of FeS/MnS/ZnS Mixed Crystals By means of chemical vapor transport using iodine as transport agent (900 → 800 °C) it is possible to prepare in the quasiternary system FeS/MnS/ZnS the mixed crystals (Fe,Mn,Zn)S (sphalerite and wurtzite type), (Fe,Mn)S(ZnS) (NaCl type) and FeS(MnS,ZnS) (NiAs type) in form of single crystals. Based on the composition of these phases the phase diagram for the system FeS/MnS/ZnS at 800 °C was drawn up. The incongruent transport process leads to the accumulation of ZnS in the crystallization zone.     

Chemischer Transport fester Lösungen. 27. Mischphasenbildung und chemischer Transport im System ZnSe/GaAs

Chemical Vapor Transport of Solid Solutions. 27. Formation of Solid Solutions and Chemical Vapor Transport in the System GaAs/ZnSe The miscibility of ZnSe and GaAs as a function of temperature has been investigated. At temperatures above 1100 °C GaAs and ZnSe form out a continous crystalline solid solution. The phase diagram of this system is presented. Mixed crystals in the system GaAs/ZnSe can be prepared by means of chemical vapor transport using iodine as transport agent. Mass spectrometric investigations have shown the formation of AsSeI(g), an up to now unknown triatomic molecule. First approximate thermodynamic Data for AsSeI(g) are given. The knowledge of AsSeI and its thermodynamic stability is necessary to understand the transport phenomena.     

Chemischer Transport intermetallischer Phasen. 5 [1]. Der chemische Transport von Ni3Sn und Ni3Sn2

Chemical Vapor Transport of Intermetallic Systems. 5. Chemical Transport of Ni₃Sn and Ni₃Sn₂ The congruent melting intermetallic compounds. Ni₃Sn and Ni₃Sn₂ can be prepared by CVT-methods using Iodine as transport agent. Thermodynamic calculations allow to understand why Ni₃Sn and Ni₃Sn₂ but not Ni₃Sn₄ can be prepared by this manner. Some general rules concerning CVT of intermetallics are given.     

Der Chemische Transport von Mischkristallen in den Systemen MnS/ZnS,FeS/ZnS und FeS/MnS

Chemical Vapor Transport of Solid Solutions. 5 Chemical Transport of MnS/ZnS, FeS/ZnS, and FeS/MnS Mixed Crystals By means of chemical vapor transport it is possible to prepare in the quasibinary systems MnS/ZnS, FeS/ZnS, and FeS/MnS the mixed crystals (Mn,Zn)S (sphalerite- and wurtzite-type), (Fe,Zn)S (sphalerite- and wurtzite-type), (Fe,Mn)S (NaCl-type), MnS(ZnS) (NaCl-type), FeS(ZnS) and FeS(MnS) (both NiAs-type) in form of single crystals. The experiments harmonize with the phase diagrams. Lattice parameters have been determined.     

Der Chemische Transport von Mischkristallen in den Systemen MnO/ZnO,FeO/ZnO und CoO/ZnO

Chemical Vapor Transport of Solid Solutions. 3 Chemical Transport of MnO/ZnO, FeO/ZnO, and CoO/ZnO Mixed Crystals By means of chemical vapor transport using HCl as transport agent (950 → 750 °C) it is possible to prepare solid solutions of MnO, FeO, and CoO in the lattice of ZnO (wurtzite type). Preparation of solutions of ZnO in MnO, FeO resp. CoO however was possible only in the case of FeO. Single crystals up to 10 mm length could be prepared by this way. Lattice parameters have been determined. UV-Vis spectra have been measured and been discussed. Mössbauer spectra of the FeO containining compound have been recorded.     

锗分族元素二元团簇及其与Co形成的团簇离子

通过比较激光烧蚀E1/E2 (代表Ge/Sn， Ge/Pb和Sn/Pb) 和Co/E (E为Ge、Sn、Pb)混合样品形成的二元团簇负离子飞行时间质谱分布和谱峰的相对强度及形成的幻数团簇离子峰，发现E1/E2二元团簇离子中原子量大的锗分族元素在团簇离子中占主要组分，而原子量小的元素则少量掺杂，其组成和分布特点说明其结构和性质与纯E团簇离子相似，可能的结构为该类负离子团簇所有原子都在笼结构的骨架上；对于二元团簇离子GeSn9－、GePb9－和SnPb9－其结构可能是双帽反四棱柱构型，只是每个原子均为骨架的一部分.而对激光烧蚀过渡金属钴与锗分族元素的混合物的研究发现，反应形成了丰富的Co/E二元合金团簇负离子，分析发现该类簇离子为钴内包覆于E(锗分族元素)笼状结构.幻数离子CoGe10－、CoSn10－和CoPb10－可能具有双帽四角反棱柱结构，而CoPb12－可能具有二十面体构型，钴原子均为笼状结构的中心.     

Chemischer Transport ternärer Oxide in den Systemen Ca/Mo/O und Sr/Mo/O

Chemical Vapour Transport of Ternary Oxides in the Systems Ca/Mo/O and Sr/Mo/O The chemical vapour transport behaviour of ternary phases in the Ca/Mo/O and Sr/Mo/O systems has been investigated using Cl₂ as transport agent in a temperature gradient 1423 to 1323 K. MMoO₄ (M= Ca, Sr) migrate in the above‐mentioned temperature gradient with rates of 0.1 to 0.2 mg/h. Starting from three phase mixtures crystals of the compounds MMo₅O₈ have been grown (migration rates: M = Ca 0.1 mg/h, M = Sr 0.01 mg/h). The observed transport behaviour is compared with predictions given by thermo dynamical model calculations and the influences of source composition and the moisture contents are described in detail.     

Chemischer Transport fester Lösungen. 24 [1] Bildung von Mischphasen und chemischer Transport im System MnO/MnS

Chemical Vapor Transport of Solid Solutions. 24. [1] Formation and Chemical Vapor Transport of MnO/MnS mixed Crystals In the System MnO/MnS mixed crystals MnS_1?xO_x (x = 0 …0,04) are formend. By means of CVT methods using bromine as transport agent (1000 → 900 °C) MnO, MnS and MnS:O‐mixed phases could be obtained. The role of traces of water is discussed.     

Zum System Zn/Mo/O. II. Chemischer Transport ternärer Zinkmolybdate

On the System Zn/Mo/O. II. Chemical Transport of Ternary Zinc Molybdates The Chemical Transport is a method for preparation of phasepure multinary compounds with defined composition. We report about the possibilities to transport ternary compounds of the Zn/Mo/O system using Cl₂, HCl, Br₂, HBr, and I₂ as an agent. The influence of the solid-gas equilibria on the compositions of solids, the transport direction, and the rate is showed.