Calcium stannate
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| General | ||||||||||||||||
| Surname | Calcium stannate | |||||||||||||||
| other names |
Calcium tin trioxide |
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| Molecular formula | CaO 3 Sn | |||||||||||||||
| Brief description |
white odorless solid |
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| properties | ||||||||||||||||
| Molar mass | 206.78 g mol −1 | |||||||||||||||
| Physical state |
firmly |
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| density |
2.55 g cm −3 |
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| solubility |
practically insoluble in water (<0.5 mg l −1 at 20 ° C) |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||||||||
Calcium stannate is an inorganic chemical compound of calcium from the group of stannates with the formula CaSnO 3 .
Extraction and presentation
Calcium stannate can be obtained by dissolving tin in nitric acid and reacting with calcium nitrate .
It can also be obtained by reacting tin (IV) oxide with calcium oxide .
The synthesis is also possible by reacting a solution of calcium chloride and tin tetrachloride in hydrochloric acid with hydrogen peroxide and ammonia in water. The resulting and dried intermediate product CaSnO 2 (O 2 ) · 3H 2 O, a mixed oxide - peroxide , is then converted to calcium stannate at 900 to 1200 ° C.
Other synthetic methods are also known.
It is also produced during lead refining by the Harris process .
properties
Calcium stannate is a white, odorless solid that is practically insoluble in water. It has a distorted orthorhombic perovskite crystal structure with the space group Pbnm (space group no. 62, position 3) . However, other high pressure crystal structures are also known.
use
Calciumstannat is as an additive in barium titanate - ceramic capacitors used to generate a shift of the Curie peak. It is also used as a gas sensor , anode materials for lithium-ion batteries , catalytic converter and photocatalyst .
Individual evidence
- ↑ a b c d e f g Entry on calcium tin trioxide in the GESTIS substance database of the IFA , accessed on April 11, 2019(JavaScript required) .
- ↑ a b c G. L. Lucena, LC de Lima et al. a .: CaSnO 3 obtained by modified Pechini method applied in the photocatalytic degradation of an azo dye. In: Cerâmica. 63, 2017, p. 536, doi : 10.1590 / 0366-69132017633682190 .
- ↑ Abdoljavad Novinrooz, Parvin Sarabadani, Yousef Rezainik: Synthesis and Processing of SnO 2 , CaSnO 3 and Ca 2 SnO 4 Nanopowders by Solid-State Reaction Technique . In: Iran. J. Chem. Chem. Eng. Vol. 28, No. 2, pp. 113-119, 2009.
- ^ A b Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 450 ( limited preview in Google Book Search).
- ↑ Gerhard Pfaff: Chemical synthesis of calcium stannates from peroxo precursors. In: Materials Science and Engineering: B. 33, 1995, p. 156, doi : 10.1016 / 0921-5107 (94) 01188-5 .
- ↑ Abdul-Majeed Azad, Lucia Liew Woan Shyan, Pang Toh Yen: Synthesis, processing and microstructural characterization of CaSnO 3 and SrSnO 3 ceramics. In: Journal of Alloys and Compounds . 282, 1999, p. 109, doi : 10.1016 / S0925-8388 (98) 00808-1 .
- ↑ Gabi Förtsch, Heinz Meinholz: Handbook of operational recycling management . Springer-Verlag, 2014, ISBN 978-3-658-06445-7 , pp. 357 ( limited preview in Google Book search).
- ↑ Data sheet Calcium tin oxide, 99% (metals basis excluding Mg), Mg <1% from AlfaAesar, accessed on April 11, 2019 ( PDF )(JavaScript required) .