Selenium Sulfide SeS2 || Sulfides

Gallium Sulfide or Digallium Trisulfide Ga₂S_3, white solid, density 3.46~3.65g/cm³, melting point of 1090~1255⁰C, molecular mass 235.641, CAS 12259-25-5, is sensitive to moisture, dissolves in water slowly, and easily soluble in concentrated alkaline to form gallate salt but also soluble in hydrochloric acid and nitric acid. Gallium Sulfide yellow layered crystal sublimates at 900-1000⁰C and decompose above melting point. Gallium Sulfide Ga₂S₃ crystal 99.999% purity is yellow colored and transparent, which is synthesized by CVD chemical vapor deposition method. Alpha phase Gallium Sulfide is a semiconductor with an indirect band gap of ~2.6 eV. It is widely used for semiconductor industry and thin film solar cells. 

Germanium Sulfide or Germanium Disulfide GeS₂, white powder, orthorhombic structure, density: 2.19 g/cm³ , melting point 800⁰C, molecular mass 136.77, CAS No. 145114-13-2, is a compound of Germanium and Sulfur. Dry Germanium Sulfide is stable in air. Germanium monosulfide can only be prepared from weak acidic or alkaline solution, which will dissolve again when the acidity increases. It can also react with hydrogen chloride and decompose at room temperature. High purity Germanium Sulfide GeS₂ 99.999%, 99.9999% 5N 6N purity, reddish-yellow, amorphous or rhomb crystal and its related compounds are synthesized by Chemical Vapor Deposition (CVD) process at low temperatures and pressures, which has great utility in solid electrolyte memory elements and other electronic devices.

Tin Sulfide or Tin Disulfide SnS₂, dark-gray or black Crystalline powder or lump, molecular mass 182.84, density 4.5 g/cm³, CAS No.1314-95-0, boiling point 1202.34°C, is insoluble in water, hydrochloric acid and nitric acid, but soluble in concentrated hydrochloric acid HCl (decomposes), aqua regia and alkaline solution. Tin Sulfide is a compound of Tin and Sulfur by the process of vacuum smelting at high temperature and pressure and zone floating methods. Tin Sulfide or Tin Disulfide SnS₂ crystal 99.995% 99.999% 5N 6N purity by Flux Zone growth is golden yellow crystal appearance, belongs to p-type IV-VI semiconductor with an indirect band gap of ~2.2 eV, which is of interest for use as a nontoxic, inexpensive component in heterojunction photovoltaic devices, Polymerization catalyst. 

Arsenic Sulfide or Diarsenic Trisulfide As₂S₃, red lustrous monoclinic crystal, CAS No.1303-33-9, melting point 360°C, boiling point 707°C, molecular weight 246.04, density 3.5g/cm³, is soluble in acids and alkalis but insoluble in water. Arsenic Trisulfide is also known as ruby arsenic because it is a reddish-orange color, which is used as a depilatory agent, a paint pigment, shot manufacture, pyrotechnics, rodenticide, taxidermy and to make red glass, fireworks etc. Arsenic Sulfide or Arsenic Trisulfide crystalline solid is used as a semiconductor and in photo optic applications.

Sulfide Solid Electrolytes Li₂S+SiS₂+ Al₂S₃ and Li₂S+SiS₂+ Al₂S₃  Chemical batteries play an important role in energy storage and conversion, Lithium ion batteries have proven themselves the main choice of power sources for portable electronics. Besides consumer electronics, lithium ion batteries are also growing in popularity for military, electric vehicle, and aerospace applications. However, traditional lithium-ion batteries usually use organic liquid electrolytes with relatively high ionic conductivity, but there are many disadvantages such as the risk of inflammable and explosive, short life and low energy density.

Compared with the lithium-ion battery with liquid electrolyte, All-solid-state lithium battery with non combustible solid electrolyte can avoid these problems，  meanwhile the solid electrolyte can also effectively inhibit the formation of lithium dendrite, thus improving the service life of the battery. Among which sulfide-based solid electrolytes have become more widespread and attracted significant attention because they possess high conductivities and good mechanical properties for the formation of effective interfaces between solids. The most typical sulfide crystalline solid electrolyte is thio-LISICON, a lithium superionic conductor, the new crystalline material family found in the Li ₂S-GeS₂-P₂S₅ system, the general chemical formula is Li4-xA1-xBxS4 (A=Ge, Si…, B= P, Al, Zn…), which demonstrates the highest lithium-ion conductivity of 2.2 × 10^-3s cm^-1 at room temperature, together with negligible electronic conductivity, high electrochemical stability. Solid electrolyte materials Li₂S+SiS₂+ Al₂S₃ and Li₂S+SiS₂+ Al₂S₃, a novel and promising solid electrolytes, prepared by a high-energy ball-milling process or by a conventional melt-quenching method act as both an ionic conductor and a separating membrane in all-solid-state rechargeable lithium batteries, which have high ionic conductivity, negligible electronic conductivity, wide operating voltage window and good chemical compatibility with the electrode.

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