The Baiyangping Cu–Ag polymetallic ore district is located in the northern part of the Lanping-Simao foreland fold belt, between the Jinshajiang-Ailaoshan and Lancangjiang faults, and the deposit can be divided into eastern and western ore zones. Based upon microscope observation of ore minerals and analysis of zinc, copper, and …

Strontium is a Group II alkaline earth metal. Elemental strontium (atomic number 38) is a soft, silver-gray metal that behaves similar to the other alkaline earth metals in group II. Strontium occurs naturally in the earth's mantle as a mixture of four stable isotopes, i.e. Sr-84, Sr-86, Sr-87 and Sr-88 (Gupta et al., 2018a).

Section snippets Preparation of ion-substituted HA. All the samples were synthesized using a one-step hydrothermal method. In brief, Ca(NO 3) 2 ·4H 2 O, AgNO 3, Sr(NO 3) 2, and Na 3 PO 4 were used as the Ca, Ag, Sr, and P sources, respectively. For pure HA nanocrystallite, Ca(NO 3) 2 ·4H 2 O and Na 3 PO 4 with a molar ratio of 10:6 …

In this study, silver (Ag) and strontium (Sr) doped mesoporous bioactive glass nanoparticles (Ag-Sr MBGNs) were prepared by a +modified Stöber process. In this method, Ag & Sr2+ were co-substituted in pure MBGNs to harvest the antibacterial properties of Ag ions, as well as pro-osteogenic potential of Sr2 ions. The effect of the …

Abstract. Strontium isotopes (87Sr/86Sr) are useful to trace processes in the Earth sciences as well as in forensic, archaeological, palaeontological, and ecological sciences. As very few large-scale Sr isoscapes exist in Australia, we have identified an opportunity to determine 87Sr/86Sr ratios on archived fluvial sediment samples from the …

The strontium‐doped variants were synthesized by combining analar grade strontium carbonate (Merck, Darmstadt, Germany) to the calcium silicate using the formula (Ca x,Sr (1‐x)] 3 Si O 5) with a variation X = 0 for substituted and X = 1 for pure tricalcium silicate. After mixing, the product was sintered at 1200°C for 2 h, cooled and ...

These problems have prompted a significant body of research regarding the …

1 day agoTo decarbonize steel production and its high carbon dioxide emissions, …

Similarly to the Group 1 oxides, the hydrides of the Group 1 elements react with water to form a basic solution. In this case, however, hydrogen gas is produced with the metal hydroxide. The general reaction for alkali metal hydrides and water is given below: MH(s) +H2O(l) M+(aq) + OH−(aq) +H2(g) (4)

Incorporation of strontium ions into the apatite structure is a slightly slower process and involves the formation of bonds between phosphate groups and strontium ions [51,52,53,54,55,56,57]. The first reports on this topic appeared as early as 1870, when the incorporation of Sr into bone structure was noted in animals fed with strontium ...

Strontium (Sr), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. It is used as an ingredient in red signal flares and phosphors and is the principal health hazard in …

Strontium (CAS ) compounds are used in making ceramics and glass products, pyrotechnics, paint pigments, fluorescent lights, and medicines. Strontium is a naturally occurring element found in rocks, soil, dust, coal, and oil. It was discovered in 1790. Powdered metallic strontium may constitute an explosion hazard when exposed to flame ...

The nano-HA + silver/strontium coatings often contain Al, P, Cl, Ca, Ti, V, Sr and Ag; among which, elements such as P and Ca are primarily derived from carbonated HA while Sr and Ag are derived from replacement of Ca 2+ ions in HA crystals with Ag + and Sr 2+. Thus, these coatings are suitable for cell proliferation due to the presence of ...

Figure 1. The electronic DOS for slabs with oxygen vacancy, total spin Sz = 1. ( a) V O in the central layer of the slab (space group SG 1); ( b) V O on the surface of the slab (SG 6). α_Total ...

Processing for ceramics. (a) crushing the raw materials (b) shaping them by various means (c) drying and forging (d) finishing operating. glasses. (a) mixing and melting the raw materials in a furnace (b) shaping them in molds. Shape forming processes. Powder pressing, casting, plastic forming. Powder pressing.

In this study, silver (Ag)- and strontium (Sr)-doped mesoporous bioactive glass nanoparticles (Ag-Sr MBGNs) were prepared by a modified Stöber process. In this method, Ag+ and Sr2+ …

Mathematical description. Fungus A. terreus exhibited the highest strontium uptake capacity at 15°C at an initial strontium ion concentration of 876 mg L −1 and an initial pH of 9. Biosorption capacity increased from 219 to 308 mg g −1 with a decrease in temperature from 45°C to 15°C at this initial strontium concentration.

Strontium is also found naturally in soil due to the release of coal ash and industrial wastes. Soluble strontium compounds, through chemical reactions, can transform to insoluble and vice versa. The long half-life of strontium-90 (29 years) can allow airborne particles to move all around the world.

Nickel oxide and silver oxide nanoparticles have wonderful properties that could be employed in numerous applications. Thus, synthesis of nickel silver oxide nanostructures with different characteristics is of great interest. In this review, many synthesis methods were reported such as: electrodeposition, electrochemical method, …

Strontium Mining. Only two minerals, celestite and strontianite, contain strontium in …

Strontium-90, a radioactive isotope of strontium, is a common product of nuclear explosions. It has a half-life of about 28.8 years and decays into yttrium-90 through beta decay. Strontium-90 is especially deadly since it has a relatively long half-life, is strongly radioactive and is absorbed by the body, where it accumulates in the skeletal ...

Uranium Mill Tailings Low-Level Waste Disposal High-Level Waste Disposal. ... (Ag 105) Silver 110m (Ag 110m) Silver 111 (Ag 111) Sodium 22 (Na 22) Sodium 24 (Na 24) Strontium 85 (Sr 85) Strontium 89 (Sr 89) Strontium 90 (Sr 90) Strontium 91 (Sr 91) Strontium 92 (Sr 92) Sulphur 35 (S 35) Tantalum 182 (Ta 182) Technetium 96 (Tc 96)

The use of strontium isotopes in pre-historic mobility studies requires accurate isoscapes for evaluating whether pre-historic individuals are local to the areas in which they were buried or not. Isoscapes are often based on modern-day samples, commonly surface waters. There is, however, growing evidence that modern-day farming …

Strontium isotope ratios of the KYT individual are consistent with having originated from contexts of the Serednii Stih (Sredny Stog) culture sites of the Middle Dnipro Valley. ... Trypillia from Dniester to Dnieper in the second half of the 5th mill. BC: farming colonization, invasions, migrations (possibilities of investigations). Tyragetia ...

DOI: 10.1016/j.matchemphys.2022.126513 Corpus ID: 250656922; Investigation of nano-crystaline strontium hexaferrite magnet powder from mill scale waste by the mechanochemical synthesis: Effect of the annealing temperature

Fact file. Atomic number: 38; atomic weight: 87.62; melting point: 769ºC; boiling point: 1384ºC; density: 2.5 kg l -1 (2.5 g cc -1 ). Strontium is a silvery, white, relatively soft metal, and a member of …

A series of silver-doped strontium hexaferrite with the chemical formula SrAgZFe12-zO19 (0.0 ≤ z ≤ 1.0) were synthesized by the Co-precipitation method. The crystal structure, morphology, and properties of microwave absorption with Ag concentration were studied. The structural analysis by XRD revealed that the samples are crystallized …

In this contribution, we explore the loading and controlled delivery of Ag and …

The ball milling of commercial strontium hexaferrite powder for up to 42 …

The effects of exposure to any hazardous substance depend on the dose, the duration, how you are exposed, personal traits and habits, and whether other chemicals are present. For more information, call the ATSDR Information Center at 1-800-232-4636. This public health statement tells you about strontium and the effects of exposure.