title: Thermal stability and thermodynamic characteristics of crystalline hydrates of cobalt(II) fluoride
metadata.name: dc.contributor.author
metadata.value: Badalov, Abdulhayr B.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Nasriddinov, Subhiddin K.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Islamova, Muqaddama S.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2017-03-20T15:44:13Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2017-03-20T15:44:13Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2016-12
metadata.lang: -
metadata.name: dc.identifier.other
metadata.value: 10.21638/11701/spbu04.2016.411
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/6112
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: By interaction of freshly-precipitated cobalt(II) hydroxo-carbonate (CoOH)2CO3 with 35% water
  solution of hydrofluoric acid the cobalt (II) fluoride tetrahydrate CoF2 · 4H2O was synthesized;
  its composition is confirmed by results of chemical analysis. The enthalpies of (CoOH)2CO3
  interactions with hydrofluoric and nitric acids in solutions was determined using the method
  of dissolution calorimetry. On the basis of these data, as well as on the basis of data for byside
  processes observed in the systems considered together with available reference data, previously
  unknown values of enthalpy of formation (ΔH0
  298) of CoF2 · 4H2O and (CoOH)2CO3 have
  been determined, namely −1881 ± 20 and −1428 ± 31 kJ/mol, correspondingly. It has been revealed
  using the tensimetry method with membrane null manometer that thermal dehydration
  of CoF2 · 4H2O takes place in the interval of temperatures ΔT = 295 ÷ 345 K and it means
  the loss of three (from four) moles of crystalline water with the formation of CoF2·H2O. The
  process of CoF2·H2O dehydration occurs within the temperature interval ΔT = 350 ÷ 380 K.
  Using the barograph equations the thermodynamic characteristics of dehydration processes have
  been determined. The thermodynamic characteristics for CoF2 · 4H2O were calculated based on
  the aforementioned data and reference information for the components of these systems, namely:
  ΔH0
  298 = −1865 ± 18 kJ/mol; S0
  298 = 400 ± 21J/(mol·K) were calculated. The same parameters
  for CoF2 · H2O are the follows: ΔH0
  298 = −901±19 kJ/mol; S0
  298 = 229±21 J/(mol·K). Refs 21.
  Tables 6.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: ru
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: St Petersburg State University
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Vestnik of St Petersburg University. Series 4. Physics. Chemistry;Vol. 3 (61); Issue 4
metadata.lang: -
metadata.name: dc.subject
metadata.value: crystalline hydrates
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: cobalt
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: fluorides
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: hydroxo-carbonate
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: calorimetry
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: tensimetry
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: dehydration
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: thermodynamic characteristics
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Thermal stability and thermodynamic characteristics of crystalline hydrates of cobalt(II) fluoride
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 11-Nasriddinov.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/6112/1/11-Nasriddinov.pdf
resources.format: Adobe PDF
resources.size: 291,6 kB