Thermodynamics of formation of double salts M2SO4·M′SO4·6H2O and M2SeO4·M′SeO4·6H2O where M denotes Rb, or Cs and M′ denote Co, Ni, or Zn

Christov, Christomir

doi:10.1016/j.jct.2003.08.004

Cited by 10 publications

(4 citation statements)

References 41 publications

(164 reference statements)

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“…Correspondingly, the surface roughness (peak-to-peak) increases from 4.2 nm to approximately 83 nm within 60 min. Comparing the solubility constant of Zn(OH) 2 (K sp = 1.2 × 10 -17 ) with the solubility constant of ZnSeO 4 ·6H 2 O ( K sp = 2.6 × 10 -2 ) leads to the conclusion that mainly insoluble Zn(OH) 2 is formed at the ZnSe surface, with only small amounts being dissolved . While the formation of Zn(OH) 2 has already been confirmed by IR microscopy, this can also be derived from the AFM images.…”

Section: Resultsmentioning

confidence: 74%

Analysis of Corrosion Processes at the Surface of Diamond-Like Carbon Protected Zinc Selenide Waveguides

et al. 2004

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A detailed surface analytical study on the corrosion behavior of unprotected and diamond-like carbon (DLC)-coated mid-infrared (MIR) waveguides used in remote sensing applications at strongly oxidizing conditions is presented. High-quality DLC films, with a thickness of 100 nm serving as MIR-transparent corrosion barrier, have been produced at the surface of zinc selenide (ZnSe) attenuated total reflection waveguides via pulsed laser deposition techniques. IR microscopy and atomic force microscopy are applied to investigate the chemical inertness of DLC-based membranes against aqueous solutions of hydrogen peroxide. These stability studies show that uncoated ZnSe waveguides are subject to severe chemical surface modifications, while DLC-protected waveguides maintain their optical properties and chemical integrity. In situ studies on the corrosion behavior by a recently developed approach combining scanning electrochemical microscopy (SECM) with Au/Hg amalgam ultramicroelectrodes in a scanning stripping voltammetry experiment provides additional insight into the mechanisms of the corrosion process. It is demonstrated that the combination of surface analytical techniques and, in particular, the innovative application of SECM with amalgam electrodes provides superior information on corrosion processes at the surface of optical waveguides. This detailed study confirms the efficiency of protective DLC coatings deposited onto IR-transparent optical waveguides, rendering this novel concept ideal for sensing applications in harsh environments.

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Section: Resultsmentioning

confidence: 74%

Analysis of Corrosion Processes at the Surface of Diamond-Like Carbon Protected Zinc Selenide Waveguides

et al. 2004

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“…This unstable trend can be explained by higher solubility products of Ni–sulfate than phosphate ones implying weaker interaction between Ni and sulfate. 38,44 Because the previous literature 21 claims that the stability improvement is attributed to the surface-formed charge repulsion layer in sulfate-containing alkaline medium solutions, the charge repulsion theory has been examined at non-extreme pH levels through adding redox probes in the following sections.…”

Section: Resultsmentioning

confidence: 99%

Dynamic stabilization of nickel-based oxygen evolution electrocatalysts in the presence of chloride ions using a phosphate additive

Komiya,

Obata,

Honma

et al. 2024

J. Mater. Chem. A

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“…Christomir Christov [6] proposed that the existence of double salts depends on the possibility of obtaining closest packing of their crystal structures. The double salt structures consist of almost regular Ni(H 2 O) x (SO 4 ) 6-x 2octahedral , SO 4 2tetrahedral and univalent cations occupying holes between them.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

A New Ultraviolet Filter: Growth and Characterization of Sodium Nickel Sulfate Tetrahydrate Single Crystal

Wang

Xing

2011

AMR

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Large single crystal of Na2Ni (SO4)2.4H2O (NNSH) was grown for the first time using method of isothermal decrease of supersaturation. The crystal structure of NNSH is determined by single crystal X-ray diffraction method, which is far different from the structure of known nickel sulfate hexahydrate series compounds. The growth habit, optical transmission spectrum and thermal stability are first reported in this paper. Similar optical transmission spectrum with nickel sulfate hexahydrate (NSH) crystal shows that NNSH crystal can also been used as ultraviolet light filter (ULF). The dehydration temperature (tdh) is 132º, which is much higher than commercial available ultraviolet filters, this is correlate with the unique crystal structure of NNSH crystal.

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Thermodynamics of formation of double salts M2SO4·M′SO4·6H2O and M2SeO4·M′SeO4·6H2O where M denotes Rb, or Cs and M′ denote Co, Ni, or Zn

Cited by 10 publications

References 41 publications

Analysis of Corrosion Processes at the Surface of Diamond-Like Carbon Protected Zinc Selenide Waveguides

Analysis of Corrosion Processes at the Surface of Diamond-Like Carbon Protected Zinc Selenide Waveguides

Dynamic stabilization of nickel-based oxygen evolution electrocatalysts in the presence of chloride ions using a phosphate additive

A New Ultraviolet Filter: Growth and Characterization of Sodium Nickel Sulfate Tetrahydrate Single Crystal

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