Ag Sb Research Articles

Origin and tectonic implications of the Zhaxikang Pb–Zn–Sb–Ag deposit in northern Himalaya: evidence from structures, Re–Os–Pb–S isotopes, and fluid inclusions

The Zhaxikang Pb–Zn–Sb–Ag–(Au) deposits, located in the eastern part of northern Himalaya, totally contain more than 1.146 million tonnes (Mt) of Pb, 1.407 Mt of Zn, 0.345 Mt of Sb, and 3 kilotonnes (kt) of Ag. Our field observations suggest that these deposits are controlled by N–S trending and west- and steep-dipping normal faults, suggesting a hydrothermal rather than a syngenetic sedimentary origin. The Pb–Zn–Sb–Ag–(Cu–Au) mineralization formed in the Eocene as indicated by a Re–Os isochron age of 43.1 ± 2.5 Ma. Sulfide minerals have varying initial Pb isotopic compositions, with (206Pb/204Pb)i of 19.04–19.68, (207Pb/204Pb)i of 15.75–15.88, and (208Pb/204Pb)i of 39.66–40.31. Sulfur isotopic values display a narrow δ34S interval of +7.8–+12.2‰. These Pb–S isotopic data suggest that the Zhaxikang sources of Pb and S should be mainly from the coeval felsic magmas and partly from the surrounding Mesozoic strata including metasedimentary rocks and layered felsic volcanic rocks. Fluid inclusion studies indicate that the hydrothermal fluids have medium temperatures (200–336 °C) but varying salinities (1.40–18.25 wt.% NaCl equiv.) with densities of 0.75–0.95 g/cm3, possibly suggesting an evolution mixing between a high salinity fluid, perhaps of magmatic origin, with meteoric water.

Gold to aurostibite transformation and formation of Au-Ag-Sb phases: the Krásná Hora deposit, Czech Republic

AbstractRare phases of the Au–Ag–Sb system were recognized in the Krásná Hora Sb-Au deposit (Sb 1.5–3 wt.%; Au 3–5 ppm), Czech Republic which correspond to auriferous dyscrasite (up to 7 at.% Au), auriferous allargentum (up to 34 at.% Au), and an unnamed phase with composition similar to the eutectics (E1, E2) of the experimental Au–Ag–Sb system. The dominant ore mineral is stibnite with rare native antimony, native gold and a Ag-Au alloy. Textural relationships are well established: stibnite (early) →gold → aurostibite → native antimony (late). Gold is present in four generations: Au-1 (0–15 at.% Ag) is the most abundant type; Au-2 (20–70 at.% Ag) forms thin rims along intra-grain boundaries of Au-1; Au-3 and Au-4 are rare and almost pure (∼0 at.% Ag). The formationof most of the Au-2 and of Au-Ag-Sb phases is associated with Ag-mobilization coupled with the Au-1 to aurostibite transformation via dissolution-precipitation and solid-state diffusion processes at temperatures <200°C.

Effects of Rapid Solidification on Phase Formation and Microstructure Evolution of AgSbTe₂-Based Thermoelectric Compounds.

We report on rapid solidification of an Ag(16.7)Sb(30.0)Te(53.3) compound using planar flow casting to stabilize the δ-AgSbTe₂ single phase and avoid precipitation of the interconnected Sb₂Te₃ phase, which leads to deterioration of thermoelectric properties. Rapidly solidified samples are in form of flakes with different thickness (60–400 μm). Precipitation of Sb2Te₃ phase is fully inhibited in thin flakes (thickness below 100 μm), which consist of an homogeneous δ-AgSbTe₂ matrix, whereas isolated Sb₂Te₃ precipitates, dispersed throughout the δ-AgSbTe₂ matrix, were found in thick flakes (thickness above 100 μm). The lattice parameter of the δ-AgSbTe₂ phase progressively increases with the cooling rate, indicating progressive supersaturation of the matrix for high degree of supercooling. Bulk specimens were prepared by hot pressing of the rapidly solidified flakes to evaluate thermoelectric properties. After sintering of the rapidly solidified flakes, the differential scanning calorimetry (DSC) traces indicates partial decomposition of the non equilibrium δ-AgSbTe₂ into the stable phases. Measurements of the thermoelectric transport properties indicate the positive effects of rapid solidification on thermal conductivity and Seebeck coefficient and its negative effect on electrical conductivity, suggesting an operative way to improve thermoelectric performance.

Syntheses, crystal structures, and photocatalytic properties of two ammonium-directed Ag–Sb–S complexes

Two novel crystalline Ag–Sb–S complexes show better photodegradation performance on CV than RhB.

Hierarchical Chemical Bonds Contributing to the Intrinsically Low Thermal Conductivity in α‐MgAgSb Thermoelectric Materials

Understanding the lattice dynamics and phonon transport from the perspective of chemical bonds is essential for improving and finding high‐efficiency thermoelectric materials and for many applications. Here, the coexistence of global and local weak chemical bonds is elucidated as the origin of the intrinsically low lattice thermal conductivity of non‐caged structure Nowotny–Juza compound, α‐MgAgSb, which is identified as a new type of promising thermoelectric material in the temperature range of 300–550 K. The global weak bonds of the compound lead to a low sound velocity. The unique three‐centered MgAgSb bonds in α‐MgAgSb vibrate locally and induce low‐frequency optical phonons, resulting in “rattling‐like” thermal damping to further reduce the lattice thermal conductivity. The hierarchical chemical bonds originate from the low valence electron count of α‐MgAgSb, with the feature shared by Nowotny–Juza compounds. Low lattice thermal conductivities are therefore highly possible in this series of compounds, which is verified by phonon and bulk modulus calculations on some of the compositions.

Chimneys in Paleozoic massive sulfide mounds of the Urals VMS deposits: Mineral and trace element comparison with modern black, grey, white and clear smokers

In the Urals, a wide range of well-preserved chimneys are found in VMS deposits, which are associated with ultramafic (Atlantic type: Dergamysh), mafic (Cyprus type: Buribay), bimodal mafic (Uralian type: Yubileynoye, Sultanovskoye, Yaman-Kasy, Molodezhnoye, Uzelga-4, Valentorskoye) and bimodal felsic (Kuroko or Baymak type: Oktyabrskoye, Tash-Tau, Uselga-1, Talgan, Alexandrinskoye) sequences. Chimneys have also been found in the Safyanovskoye deposit (Altay type) that is hosted by intercalated felsic lavas and carbonaceous shales. A combination of geological, mineralogical and trace element data provide a general outline for comparison between chimneys from the Urals deposits and modern vent sites. The chimneys from the Dergamysh deposit show a broad affinity with those from the Rainbow and other vent sites associated with serpentinites of the Mid-Atlantic Ridge. The chimneys from the Buribay deposit are similar to the black smokers of the EPR vent sites including the scarcity of rare minerals. The chimneys from the Urals type of the VMS deposits show some similarities with grey smokers from the Brother Volcano and PACMANUS sites. The chimneys from the Baymak type of the VMS deposits resemble grey and white smokers of the PACMANUS and grey smokers of the Suiyo vent sites. The chimneys from the Safyanovskoye deposit are similar to the black and clear smokers from the Okinawa Trough. Mineral assemblages are controlled by the combination of host rock composition and physico-chemical conditions of the ore-forming processes. Amount of colloform pyrite, isocubanite and pseudomorphic pyrite and marcasite after pyrrhotite decreases in the chimneys across the range from ultramafic and mafic to felsic-hosted deposits and is concomitant with increase in the contents of sphalerite, galena, bornite, fahlores, native gold and barite across this range. The chimneys from the Urals type contain abundant tellurides and sulfoarsenides, while these minerals are rare (except for hessite) in the Baymak type deposits. In the same range, the buffering capacity of host rocks decreases in contrast to the increase in ƒS2 and ƒO2. With the exception of the Safyanovskoye deposit, trace element assemblages in chalcopyrite vary to reflect the host rock: ultramafic (high Se, Sn, Co, Ni, Ag and Au)→mafic (high Co, Se, Mo and low Bi, Au and Pb)→bimodal mafic (high Te, Au, Ag, Bi, Pb, Co, moderate Se, and variable As and Sb)→bimodal felsic (high As, Sb, Mo, Pb, moderate Bi, and low Co, Te and Se). In sphalerite of the same range, the contents of Bi, Pb, Ag, Au and Sb increase versus Fe, Se and Сo. The variations in trace elements in colloform pyrite coincide with these changes. The specific mineral changes in the local ranges from Cu- to Zn-rich chimneys in each VMS deposit are similar to the general changes in the range of host rock classes of the deposits. However, the local T, ƒS2 and ƒO2 changes can broadly be interpreted in terms of contribution of variable oxygenated cold seawater to the subseafloor and seafloor hydrothermal processes.

Identification and mapping of geochemical patterns and their significance for regional metallogeny in the southern Sanjiang, China

The southern Sanjiang region, southwestern China, comprises various continental blocks, tectonic sutures and arcs. This complex structural area is a proper place for the recognition of geochemical patterns and understanding of regional metallogenesis. Considering each individual tectonic unit (i.e., western South China block, Ailaoshan suture, Simao block, Changning–Menglian suture, Baoshan block and Tengchong block) as a statistical unit, this study identifies the distribution patterns of geochemical elements, distinguishes elemental associations for different geological backgrounds (controlled by the regional lithology) and diverse mineralizations, and thereby delineates the mineralized anomalies. To achieve the goals, the kriging interpolation, staged factor analysis and local singularity technology were utilized after the centered logratio (clr) transformation of stream sediment geochemical data. The spatial distributions of metallogenic elements (Au, Ag, Cu, Pb, Zn and Sn) show that not all the areas with high concentrations of elements contain ore deposits. It means that the formation of ore deposits is an independent anomalous geological event, not necessarily related to the original regional abundance of geochemical elements. The different element associations obtained by staged factor analysis of 28 elements are able to reveal the geological backgrounds and metallogenic signatures for different tectonic units. For example, the element associations for the first, second and third factors (Fs) in the western South China block are groups of Ti–Co–V, Sb–Ag–As and Th–U–Be (see text for the detailed element associations), which represent the Emeishan flood basalts, Ag–Pb mineralization and felsic rocks, respectively. Similarly, the element associations Co–V–Cu, Be–U–Th and Sb–Ag–Au for F1, F2 and F3 in the Ailaoshan suture respectively represent the ophiolite complex and mafic rocks, felsic rocks and Au mineralization. The associations from F1 to F4 in the Simao block are Th–U–Sn, V–Co–Cr, Cd–Ag–Pb and Au–Sb, which represent the Linchang batholith, mafic rocks, Ag–Pb–Zn mineralization and Au mineralization, respectively. The distribution patterns of their factor scores can roughly distinguish the anomalies caused by regional backgrounds and mineralizations. The local singularity of factor scores for mineralization can further identify mineralized areas in most of the tectonic units. Nevertheless, an exception occurs in the western South China block where the background element association, Ti–Co–V–Cu–Ni–Cr–P–Mn–Nb–Zn (F1), obscures the Au signature. Therefore, we substituted the single element Au for mineralized element association (F1) to perform singularity mapping, and obtained better result. It was concluded that the combination of staged factor analysis, local singularity and tectonic setting is effective in regional metallogenic potential analysis.

Identifying Enclosed Chemical Reaction and Dynamics at the Molecular Level Using Shell-Isolated Miniaturized Plasmonic Liquid Marble.

Current microscale tracking of chemical kinetics is limited to destructive ex situ methods. Here we utilize Ag nanocube-based plasmonic liquid marble (PLM) microreactor for in situ molecular-level identification of reaction dynamics. We exploit the ultrasensitive surface-enhanced Raman scattering (SERS) capability imparted by the plasmonic shell to unravel the mechanism and kinetics of aryl-diazonium surface grafting reaction in situ, using just a 2-μL reaction droplet. This reaction is a robust approach to generate covalently functionalized metallic surfaces, yet its kinetics remain unknown to date. Experiments and simulations jointly uncover a two-step sequential grafting process. An initial Langmuir chemisorption of sulfonicbenzene diazonium (dSB) salt onto Ag surfaces forms an intermediate sulfonicbenzene monolayer (Ag-SB), followed by subsequent autocatalytic multilayer growth of Ag-SB3. Kinetic rate constants reveal 19-fold faster chemisorption than multilayer growth. Our ability to precisely decipher molecular-level reaction dynamics creates opportunities to develop more efficient processes in synthetic chemistry and nanotechnology.

Thermodynamic study in the Ag–Sb–S system by the EMF method

In this study, thermodynamic properties of AgSbS2 and Ag3SbS3 have been determined by the advanced EMF method. All the measured phases have been carefully synthetized in evacuated quartz glass ampoules. The synthesized phases were analyzed by the SEM–EDS and DSC techniques. Solid state electrochemical cells of the type (Ag|AgI|Ag–Sb–S-compounds in equilibrium) were applied in EMF measurements. Independent experimental apparatuses were applied to prove the reproducibility of the measured EMF values. The measured E vs. T relations were analyzed, and thermodynamic functions of AgSbS2 and Ag3SbS3 have been determined. Accurate thermodynamic properties of both phases including data in new temperature ranges have been obtained. The results were compared with the available literature data and discussed.

Diffusivities and atomic mobilities in Sn–Ag–In and Sn–Ag–Sb melts

The recently developed Arrhenius formula of a modified Sutherland equation was employed to calculate the self– and impurity diffusivities in liquid Sn, Ag, In and Sb. The reliability of the calculated self– and impurity diffusivities was validated by comparing the presently calculated results with the critically reviewed literature data. Based on the reliable tracer and chemical diffusivities available in the literature, the atomic mobility parameters in Sn–Ag–In and Sn–Ag–Sb melts were then evaluated with the aid of the available thermodynamic descriptions for the liquid phase. Comprehensive comparisons show that most of the measured and theoretical diffusivities in Sn–Ag–In and Sn–Ag–Sb melts can be reasonably reproduced by the currently obtained atomic mobilities. Moreover, the atomic mobilities were further verified by comparing the model–predicted concentration profiles with the measured ones in various liquid Sn–Ag–Sb diffusion couples.

Синтез и строение иодотрис(трифенилстибин)серебра [(Ph3Sb)3AgI

Interaction of silver iodide with triphenylstibine in dimethyl sulfoxide has led to the neutral complex iodotris(triphenylstibine)silver (1), whose structure has been established by X-ray diffraction analysis. The silver atom has distorted tetrahedral coordination. The angles SbAgSb and SbAgI equal 106.501(13)°, 109.644(13)°, 111.099(13)° и 103.063(13)°, 111.594(14)°, 114.337(14)°, the bond lengths Ag–Sb and Ag–I equal 2.7291(4), 2.7326(4), 2.8087(4) и 2.7600(4) A.

Effect of Graphene Oxide Nano-Sheets (GONSs) on thermal, microstructure and stress–strain characteristics of Sn-5 wt% Sb-1 wt% Ag solder alloy

Regarding to the development of Sn–Sb–Ag (SSA) lead-free (plain) solders for advance electronic components, the effect of 0.2 wt% Graphene Oxide Nano-Sheets (GONSs) on thermal, microstructure and stress–strain characteristics of Sn-5 wt% Sb-1.0 wt% Ag (SSA510) lead-free solder alloy is investigated. Experimental results showed that addition of GONSs to SSA510 (composite) solder alloy slightly increased the melting temperature. Microstructure investigations revealed that addition of GONSs to SSA510 solder inhibited the growth of the β-Sn grains, SnSb and Ag3Sn intermetallic compounds which subsequently reinforced the strength and increased the resistance to deformation of the SSA510 composite solder. Increasing strain rate resulted in increasing the tensile strength while increasing the testing temperature decreased the strength of both the plain and composite solder alloys. Good and excellent higher values of strength accompanied with high ductility were attained in the composite solder at all test conditions compared with those in the SSA510 plain solder. Thereby, addition of GONSs to the SSA solder makes composite solder joints to be more efficient for industrial applications that can make composite solder endure higher stresses.

A.C. conduction in glassy alloys of Se90Sb10-xAgx

Temperature and frequency dependence of a.c. conductivity is studied in glassy Se90Sb10-xAgx (x=2, 4, 6 and 8) in the temperature range (288–358K) and frequency range (1–500kHz). An agreement between experimental and theoretical results suggests that the behavior of glassy Se–Sb–Ag system can be successfully explained by correlated barrier hopping (CBH) model. The results show that bipolaron hopping dominates over single polaron hopping in present case, which is explained in terms of lower value of potential barrier. By fitting the experimental data to CBH model, the density of charged defect states is calculated for all the glasses studied. The composition dependence of the density of these states is studied and found to show a maxima at 6at% of Ag which is explained in terms of the mechanically stabilized structure at a particular average co-ordination number.

Self-organisation phenomena during electrodeposition of palladium–indium alloys

The present investigation was focussed on determining the appropriate electrolyte for the deposition of palladium–indium alloy in a wide range of indium content and to investigate the possibility of observing spatio-temporal structures on the electrode surface. From polarisation experiments, it was established that the palladium–indium phase deposits at more positive potentials than the pure metals and this results at low current densities (0.1–0.3 A dm−2) in the content of the coatings being about 9–17 wt-% In. In the coatings obtained the formation of spatio-temporal structures during electrodeposition of palladium–indium alloys was observed for the first time. The period of the structures is 50–200 µm. The optically different areas of the structures show similar elemental and phase content as well as similar morphology. X-ray analysis of the sample with spatio-temporal structures shows superposition and coincidence of the spectra of the phases Pd and Pd0.85In0.15. This result is in agreement with those obtained during investigation of other electrodeposited alloys (Аg–In, Ag–Sb, Ag–Cd, In–Co, etc.) with spatio-temporal structures, which appear when simultaneously deposition of two phases with identical crystal lattice takes place.

Thermodynamic study of the Ag–Sb–Te system with an advanced EMF method

In this work, thermodynamic properties of antimony saturated AgSbTe2 (Ag0.22Sb0.28Te0.50) and silver saturated SbxTe1−x (Ag0.08Sb0.49Te0.43) have been determined by solid state EMF technique with Ag+ ion conducting β″-alumina electrolyte, for the first time. The measurements were done by electrochemical cells of type:(−)Pt, Ag|β″-alumina|Sb2Te3+Ag2Te+SbxTe1−x, Re, Pt(+)Over the temperature range 566⩽T/K⩽620.5 and(−)Pt, Ag|β″-alumina|AgSbTe2+Ag2Te+SbxTe1−x, Re, Pt(+)Over the temperature range 620.5⩽T/K⩽710.The phase transition temperature, where Sb2Te3 and Ag2Te form AgSbTe2 at 101.3kPa pressure, was found to be T=620.5K. Standard thermodynamic quantities of SbxTe1−x and AgSbTe2 were calculated from the results obtained as well as Gibbs energies of formation as linear functions of temperature. Each test electrode, containing 3 phases in equilibrium, was synthetized separately inside an evacuated quartz glass ampoule and quenched into ice water. The contents of the test electrodes were confirmed by SEM–EDS analysis. Also, the average solubility of substances in the test electrodes was calculated from the SEM–EDS data obtained. The parasitic thermovoltage involved with the measured EMF was determined by symmetrical cell arrangement and compensated from the experimental values.

(Pb–Sb)-bearing sphalerite from the Čumavići polymetallic ore deposit, Podrinje Metallogenic District, East Bosnia and Herzegovina

Čumavići is a medium– to low–temperature hydrothermal Sb–Zn–Pb–Ag polymetallic vein–type ore deposit in the Srebrenica orefield, part of the Podrinje Metallogenic District, Eastern Bosnia and Herzegovina. The ore deposit occurs in the form of simple and complex veins along faults and fractures, as well as stockworks and disseminations hosted within Neogene volcanic rocks (pyroclastics and andesite lavas of calc–alkaline affinity). The deposit comprises sulfides (sphalerite, galena, stibnite, pyrite, marcasite, chalcopyrite, arsenopyrite, gudmundite, safflorite, löllingite, gersdorffite and acanthite), sulfosalts (berthierite, geocronite, boulangerite, semseyite, plagionite, jamesonite, bournonite, twinnite, andorite, fizéliyte, Ag–bearing tetrahedrite, stephanite, polybasite, pyrargyrite and argyrodite), native gold and silver, tungstates (hübnerite), oxides, and gangue quartz, chalcedony, Mn–siderite, anglesite, smithsonite, fluorite, gypsum and ludlamite. Three generations of sphalerite are recognized in the Čumavići deposit, evolving from Fe–rich to Fe–poor. The most common are yellowish to colorless Fe–poor varieties. Electron Probe Microanalyses of sphalerite free of micro–inclusions of galena and Pb–Sb-sulfosalts revealed wide compositional variations in minor- and trace–element contents (e.g., Fe, Cd, Mn, Cu, Sn, As, and In). Of particular interest are the lead and antimony content of sphalerite, which vary from 0.10 to 3.08, and 0.02 to 1.62wt.%, respectively. Lead– and Pb–Sb-rich zones are the most common in sphalerite, while individual Sb–bearing zones are rare. These zones have fan–like forms with circular to wave-like, micron–scale bands, filled with galena or Pb–Sb sulfosalts. In the Pb–Sb zones, the Sb/Pb atomic ratio ranges between 0.3 and 1.5, similar to ratios between geocronite and jamesonite, thus suggesting the presence of micro– to nano–scale inclusion of sulfosalts within the sphalerite. The mean composition of all sphalerite samples is (Zn0.78–0.99,Fe<0.01–0.21,Cu0.00–0.02,Pb<0.01–0.01,Cd<0.01–0.01,Sb<0.01–0.01,Mn<0.01–0.01)∑0.97–1.03S0.97–1.08 (Sn and As atomic proportions are <0.01 apfu). In all sphalerite samples, excellent negative correlations have been determined between Fe and Zn, and ∑(Fe+Sb) and Zn. The studied mineralization shares many mineralogical and geological characteristics in common to polymetallic Sn–Ag–Sb deposits in Bolivia and elsewhere.

Geoavailability of lithogenic trace elements of environmental concern and supergene enrichment in soils of the Sierra de Aracena Natural Park (SW Spain)

The chestnut grove soils of the Sierra de Aracena Natural Park (SW Spain) are a striking example of geoavailability and pedochemical enrichment with geologically-sourced trace elements, notably Zn, Pb, Ag and Cd, but also As, Sb, Cu and Tl. The data from this study provide evidence that such metal(loid)s were originally bound to reactive sulphides (pyrite, sphalerite and galena) and Ag–Sb–(Pb) sulfosalts residing in the soil parent rock. At the early stages of weathering, these geoavailable elements were easily liberated from the mineralised bedrock through oxidative dissolution reactions, and then transferred to the soil, thus reaching anomalously high concentrations. The most extreme amounts of Zn (12–26gkg−1), Pb (>5gkg−1), As (346mgkg−1), Cd (319mgkg−1), Cu (197mgkg−1), Ag (154mgkg−1), Sb (109mgkg−1), and Tl (82mgkg−1) were measured in soils developed over carbonate-hosted sulphide occurrences and their related gossan outcrops. When compared to the regional pedogeochemical baseline, the soils are largely enriched with all the elements analysed, except Co, Cr and Ni, yielding concentration factors particularly high for Zn (50.8), Cd (49.3), Ag (30.6), Sb (22.5), and Pb (20.8), and geo-accumulation indices that consistently point to strong geogenic contamination. The pedochemical enrichment may be reasonably attributed to the combined result of precipitation as a solid phase (e.g., Zn-vermiculite, hemimorphite, hydrozincite, and plumbogummite) and specific adsorption by soil constituents, mainly organic matter and iron oxy-hydroxides. The survey area can be considered as a hot spot in terms of both valuable metal prospecting and environmental concern. Although the soil acted as a natural sink for lithogenic trace elements, it could eventually turn into a source of potentially hazardous contaminants in response to future land-use changes and biogeochemical alterations.

Electrochemical Study on the Ag–Sb System by Advanced Experimental Method

Electrochemical cells of the type (Ag | Ag+ electrolyte | Ag-Sb-compounds) have been applied to determine the thermodynamic properties of the intermetallic compounds in Ag-Sb system. Both AgI and β”-alumina were used as fast Ag+ ion conducting solid electrolytes. The usage of these two different electrolytes, in their respective ionic conduction domains, allowed emf measurements in the Ag-Sb system over a significantly wide temperature range. For the first time, emf values of the intermetallic compounds in the Ag-Sb system have been measured above 450K. Several different cell arrangements were applied to ensure reproducibility of the experiments and to evaluate the effects of different cell arrangements.The parasitic cell potential contributions to the emf values, resulting from thermovoltage and contact potential differences were measured by using symmetric cells. The results obtained with the symmetric cells were analyzed and compensated from the measured emf values of the actual experimental electrochemical cells.

Preliminary Understanding of Ore Genesis of Zhaxikang Pb–Zn–Ag–Sb Deposit in the North Himalaya

Preliminary Understanding of Ore Genesis of Zhaxikang Pb–Zn–Ag–Sb Deposit in the North Himalaya

ChemInform Abstract: New Quaternary Ge—Se—Sb—Ag Optical Materials: Blue Shift in Absorption Edge and Evaluation of Optical Parameters.

AbstractBulk Ge20Se60Sb20‐xAgx (x = 0, 5, 10, 15, 20) chalcogenide glasses are prepared from the elements (silica ampule, 1273 K, 20 h) and their optical properties are determined by transmittance spectroscopy in the wavelength range of 400 to 2500 nm.