From Prussian blue to iron carbides: high-temperature XRD monitoring of thermal transformation under inert gases

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F17%3A73583084" target="_blank" >RIV/61989592:15310/17:73583084 - isvavai.cz</a>
Result on the web
<a href="https://www.cambridge.org/core/journals/powder-diffraction/article/from-prussian-blue-to-iron-carbides-hightemperature-xrd-monitoring-of-thermal-transformation-under-inert-gases/F1AC86BCD9AD1467FE6B071564137C37" target="_blank" >https://www.cambridge.org/core/journals/powder-diffraction/article/from-prussian-blue-to-iron-carbides-hightemperature-xrd-monitoring-of-thermal-transformation-under-inert-gases/F1AC86BCD9AD1467FE6B071564137C37</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1017/S0885715617000471" target="_blank" >10.1017/S0885715617000471</a>

Result language
angličtina
Original language name
From Prussian blue to iron carbides: high-temperature XRD monitoring of thermal transformation under inert gases
Original language description
The thermal behavior and decomposition reaction of Prussian blue (PB) (Fe-4(3+)[Fe2+(CN)(6)](3)center dot xH(2)O) was studied under inert atmosphere of argon by simultaneous thermogravimetry and differential scanning calorimetry, from room temperature up to 900 degrees C, with a heating rate of 5 K min(-1). Parallel to the thermogravimetric measurements, the thermal process was monitored by in situ X-ray powder diffraction (XRD) technique under nitrogen atmosphere. The thermogravimetric data show six steps, corresponding to different stages of the decomposition reaction; comparable results are also obtained by in situ XRD. In addition, a set of PB samples heated up to selected temperatures (190, 300, 370, 540, 680, and 790 degrees C) were ex situ analyzed by powder XRD and Mossbauer spectroscopy. It is found that PB exhibits a negative thermal expansion prior to the water release from its crystalline lattice. Above 300 degrees C, the decomposition is based on the release of cyanogen gas from the PB structure. At 370 degrees C, a cubic iron cyanide compound is formed, while at higher temperatures several iron carbides were found. The subsequent thermal treatment of these carbides leads to the formation of metallic iron and graphite.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10403 - Physical chemistry

Project
<a href="/en/project/LO1305" target="_blank" >LO1305: Development of the center of advanced technologies and materials</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)