- Calcium tungstate
-
- $50.00 / 1KG
-
2025-09-25
- CAS:7790-75-2
- Min. Order: 1KG
- Purity: 99%
- Supply Ability: g-kg-tons, free sample is available
- Calcium tungstate
-
- $0.00 / 1KG
-
2025-06-27
- CAS:7790-75-2
- Min. Order: 1KG
- Purity: 99%
- Supply Ability: 500000kg
- Calcium tungstate
-
- $1.00 / 1KG
-
2020-01-01
- CAS:7790-75-2
- Min. Order: 1KG
- Purity: 99%
- Supply Ability: 1000KGS
|
| | Calcium tungstate Basic information |
| | Calcium tungstate Chemical Properties |
| Melting point | 1620°C | | density | 6.06 g/mL at 25 °C (lit.) | | storage temp. | -20°C | | solubility | Insoluble in H{2}O. Decomposes by hot HCl, HNO{3} | | form | Powder | | Specific Gravity | 6.062 | | color | white | | biological source | rabbit | | Water Solubility | insoluble H2O; decomposed by hot HCl, HNO3 [MER06] | | Merck | 14,1712 | | Solubility Product Constant (Ksp) | pKsp: 8.06 | | Exposure limits | ACGIH: TWA 3 mg/m3
NIOSH: TWA 5 mg/m3; STEL 10 mg/m3 | | CAS DataBase Reference | 7790-75-2(CAS DataBase Reference) | | EPA Substance Registry System | Calcium tungsten oxide (CaWO4) (7790-75-2) |
| WGK Germany | 3 | | TSCA | Yes | | HS Code | 28418030 |
| | Calcium tungstate Usage And Synthesis |
| Chemical Properties | -325 mesh, 10μm or less 99.9% pure; occurs in nature as mineral scheelite; white tetr powder(s), a=0.524 nm, c=1.138 nm; can be prepared by heating tungstic acid and CaO or CaCO3; used in tumor treatment and in luminous paint [KIR83] [STR93] [MER06]
Large orange octahedral scheelite, Ca(WO4), crystal to 4.5 cm on muscovite, KAl2(AlSi3O10)(OH)2. Pingwu Co., Mianyang pref.,
Sichuan prov., China. | | Uses | Calcium tungsten oxide is used as a luminophore. | | Uses | Calcium tungstate can be ued for preparing screens for x-ray observations and photographs; in luminous paints; in scintillation counters. | | Application | Calcium tungstate is well known as the phosphor that emits light in λ: 310–700 nm under the excitation light in λ: 220–300 nm. The peak wavelength is positioned at 440 nm, causing it to give off a blue color. | | Production Methods | A single crystal is grown from melt by the Czochralski method. Rare earth ions are easy to incorporate into the crystal during growth. Fluorescent films are deposited on a glass substrate through vacuum evaporation using a W filament heated at 2000℃ for about 3 min, followed by thermal annealing in oxygen at 550℃ for 2 h. The film becomes crystalline through this thermal annealing.
| | General Description | Calcium tungstate (CaWO4) is an optical material, which can be used as a laser host material for a variety of electronic applications. It has a scheelite structure with luminescence, and thermo-luminescence properties. | | Structure and conformation | The space lattice of CaWO4 belongs to the tetragonal system, and its Scheelite structure has lattice constants of a=0.524 nm and c=1.138 nm. The space group is I41/a, and there are four formula units per unit cell. |
| | Calcium tungstate Preparation Products And Raw materials |
| Raw materials | Calcium hydroxide-->Calcium oxide-->Sodium tungstate dihydrate-->Alkali Metals, plasma standard solution, Specpure, Ba,Be,Ca,Cs,K,Li,Mg,Na,Rb,Sr, 100μg/ml-->Tungsten trioxide |
|