Thermal and X-Ray investigation of binary cobalto-cobaltic oxide—alkali persulfate systems

Al-Shukry, Ra'ad M.; Jasim, Fadhil

doi:10.1016/0040-6031(80)85010-6

Thermochimica Acta

1980

DOI: 10.1016/0040-6031(80)85010-6

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Thermal and X-Ray investigation of binary cobalto-cobaltic oxide—alkali persulfate systems

Ra'ad M. Al-Shukry

Fadhil Jasim

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1980

1983

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Cited by 14 publications

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“…The action of metal oxides on the thermal transitions of sodium and potassium peroxodisulfates (persulfates) has been the subject of many investigations in this laboratory [1][2][3][4]. The oxides exert different effects on the reactions involved in the persulfate decomposition: some of them catalyze it, whereas others react with intermediates to form stable compounds.…”

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Thermal and X-ray diffraction investigations of vanadium(V) oxide-alkali persulfate binary systems

Jasim

Jaffer

Barbooti

1981

Journal of Thermal Analysis

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Thermoanalytieal investigations of the VzO 5-K2S~O 8 system have revevled that, m the presence of excess amounts of VzO~, the initial decomposition temperature is lowered compared to that of the pure salt, An explanation for this lowering is based on the interaction between V2On and the peroxo group of the persulfate ion. The reaction however, is, not unimolecular. The presence of an unknown potassium sulfate complex of V(V) with a catalytic character is indicated by XRD patterns obtained for samples heated up to 410% It has been found that the formation of KzVOs, KV(SO4)2, K~VsO14 and K4VxoOz7 depends on whether V205 or K2SO 4 is present in excess during thermal decomposition.Sharp d-lines for unknown phases are identified. V~Os is found to behave differently towards sodium and potassium persulfates.Compounds such as a-NaVO3, NaVOs, NaV308 and NaV6Oa5 are obtained on thermal analysis of various molar ratios of the V2Os--Na2S2Os system.

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confidence: 99%

Thermal and X-ray diffraction investigations of vanadium(V) oxide-alkali persulfate binary systems

Jasim

Jaffer

Barbooti

1981

Journal of Thermal Analysis

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Thermal and X-ray diffraction investigations of the binary system chromium(III) oxide — barium perchlorate trihydrate

Jasim

Barbooti

Hussain

1983

Journal of Thermal Analysis

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Chromium(Ill.) oxide reverses the sequence of dehydration of barium perchlorate trihydrate (BP). Between 223 and 310 ~ the oxide reacts with anhydrous BP in a 1:1 molar ratio to give the yellow barium dichromite BaCr204. Between 350 and 430 ~ this material reacts in 1:1 stoichiometry with BP, to give barium chromate BaCrO 4. The products have been identified by X-ray diffraction analysis. The formation of an unkown phase is also reported.Chromium(l I I) oxide has been shown to catalyse the thermal decomposition of the perchlorates and the chlorates of the alkali metals [1][2][3], and to interact chemically to give the metal dichromates [2,3]. The oxide also catalyses the decomposition of alkali metal pyrosulphates to the sulphates through the formation of chromium sulphate or the double sulphates with the alkali metals [4]. Udupa and Srinivasan [5] recently reported that the oxide reacts with barium chlorate via complex stoichiometry to give barium chromate BaCrO4 and barium chloride. On the other hand, the thermal decomposition of barium perchlorate (BP) is catalysed by manganese(IV)oxide and europium(Ill) oxide and the initial decomposition temperature can be lowered from 460 ~ down to 310 ~ by the action of these oxides [6].It is the purpose of the present work, therefore, to study the effects of Cr203 on the thermal decomposition of barium perchlorate. ExperimentalA MOM-photorecording derivatograph was employed for recording TG, DTG and DTA curves under static air atmosphere; a pair of MOM-platinum crucibles was used for sample and reference material (e-AI203); sample size: 100 mg, heating rate: 10 deg/min. §

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Thermoanalytical behaviour of some niobium(V) and tantalum(V) oxide—alkali persulfate binary systems

Al-Shukry

Jasim

1980

Thermochimica Acta

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Thermal and X-Ray investigation of binary cobalto-cobaltic oxide—alkali persulfate systems

Cited by 14 publications

References 6 publications

Thermal and X-ray diffraction investigations of vanadium(V) oxide-alkali persulfate binary systems

Thermal and X-ray diffraction investigations of vanadium(V) oxide-alkali persulfate binary systems

Thermal and X-ray diffraction investigations of the binary system chromium(III) oxide — barium perchlorate trihydrate

Thermoanalytical behaviour of some niobium(V) and tantalum(V) oxide—alkali persulfate binary systems

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