Thermal decomposition of the hydrated basic carbonates of lanthanides and yttrium

D’Assunção, Lázaro Moscardini; Giolito, I.; Ionashiro, Massao

doi:10.1016/0040-6031(89)87224-7

Cited by 83 publications

(19 citation statements)

References 6 publications

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“…The anhydrous compound is thermally stable up to 497 K. Above this temperature, the final decomposition takes place in a single step up to 724 K, corresponding to the exothermic peak at 685 K attributed to the oxidation reaction of Ce(III) to Ce(IV) together with the oxidation of the organic matter. This smaller thermal stability has already been observed for other kinds of cerium compounds [37][38][39]. The total mass loss up to 724 K (Calcd.…”

Section: Cerium Nalidixatesupporting

confidence: 60%

Synthesis, thermal behavior, and spectroscopic study of the solid nalidixate of selected light trivalent lanthanides

Návia

Gálico

Caires

et al. 2018

J Therm Anal Calorim

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Solid-state [Ln(nal) 3 ]ÁnH 2 O compounds, where Ln represents light trivalent lanthanide (La to Sm, except Pm), nal is nalidixate (C 12 H 11 N 2 O 3 ), and n is the number of water molecules, were synthesized. Characterization and investigation were made by means of complexometry, elemental analysis, powder X-ray diffraction, Fourier transform infrared, near infrared (NIR) and diffuse reflectance spectroscopies, simultaneous thermogravimetry and differential thermal analysis, and differential scanning calorimetry. The dehydration process occurs in a single step up to 453 K. The final temperature of dehydration decreases from Pr(III) to Sm(III), and the thermal stability of anhydrous compounds increases from La(III) to Sm(III) (except Ce), and these behaviors are related to the decrease in the ionic radius of the lanthanide ion. The thermal decomposition of the anhydrous compounds occurs in three, four, or five consecutive steps, with formation of the respective oxides CeO 2 , Pr 6 O 11 , and Ln 2 O 3 (Ln = La, Nd, and Sm) as final residues. The results also provide information concerning the composition and thermal behavior of these compounds. Spectroscopic studies in the UV-Vis and NIR regions provide information about the characteristics 4f-4f transitions for the Pr(III), Nd(III), and Sm(III) compounds, as well as the NIR region characteristic overtone and combination bands of the compounds.

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Section: Cerium Nalidixatesupporting

confidence: 60%

Synthesis, thermal behavior, and spectroscopic study of the solid nalidixate of selected light trivalent lanthanides

Návia

Gálico

Caires

et al. 2018

J Therm Anal Calorim

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“…Of the wide range of inorganic salts of rare earth elements, compounds in which REE ions have an oxidation state of +3 are the most widespread. They are mainly represented by neutral and basic salts, including the well‐studied compounds CeOHCO 3 and CeOHSO 4 …”

Section: Introductionmentioning

confidence: 99%

“…They are mainly represented by neutral [2] and basic salts, [3][4] including the well-studied compounds CeOHCO 3 and CeOHSO 4 . [5][6][7] Among REE, cerium has as pecial place, as it can easily change its oxidation state (+ 3$ + 4). In addition, cerium is the only REE that forms stable, water-soluble, inorganic compoundsi nt he oxidation state of + 4.…”

Section: Introductionmentioning

confidence: 99%

Meet the Cerium(IV) Phosphate Sisters: Ce^IV(OH)PO₄ and Ce^IV₂O(PO₄)₂

Kozlova

Миронов

Istomin

et al. 2020

Chemistry A European J

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Two new cerium(IV) phosphates were obtained: cerium(IV) hydroxidophosphate, Ce(OH)PO4, and cerium(IV) oxidophosphate, Ce2O(PO4)2, which were shown to complement the classes of isostructural compounds M(OH)PO4 and R2O(PO4)2, where M=Th, U and R=Th, U, Np, Zr. Ce2O(PO4)2 oxidophosphate is formed by elimination of H2O from the crystal structure of Ce(OH)PO4 during its thermal decomposition. The structures of Ce(OH)PO4 and Ce2O(PO4)2 are related to each other with the same Cmce space group and similar unit cell parameters (a=6.9691(3) Å, b=9.0655(4) Å, c=12.2214(4) Å, V=772.13(8) Å3, Z=8; a=7.0220(4) Å, b=8.9894(5) Å, c=12.544(1) Å, V=791.8(1) Å3, Z=4, respectively).

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“…Significant mass loss occurs for temperatures lower than 1350°C but it remains in the same order of magnitude for all samples (ie around 0.1%). It is suggested from other studies that such mass loss should correspond to the degradation of residual rare‐earth carbonates in the primary rare‐earth oxide powder, especially Nd 2 O 3 which carbonates should decompose at 900‐1000°C. For temperatures higher than 1350°C, it is clearly evidenced that the mass loss of 0.3wt.% silica‐doped Nd:YAG ceramics is higher than for pure Nd:YAG sample.…”

Section: Resultsmentioning

confidence: 99%

Silica reactivity during reaction‐sintering of Nd:YAG transparent ceramics

et al. 2016

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Silica (SiO2) is widely used as sintering aid during vacuum sintering of YAG (Y3Al5O12)‐based transparent ceramics. These ceramics are mainly used for laser applications when they are doped with rare‐earth luminescent elements such as Yb3+ or Nd3+. By means of microstructural, chemical, dilatometry, and thermogravimetry analyses, this study has evidenced that sufficiently high amount of silica (ie above the solubility limit in YAG) forms intergranular transient liquid phase of mixed composition Y‐Al‐Si‐O that vaporizes rapidly for temperatures higher than 1350°C. As a result, silica content after sintering remains always lower than the solubility limit in YAG ceramics (ie lower than 900 ppm). Finally, vacuum sintering with an external source of gaseous Si was proven to be suitable to manufacture highly transparent Nd:YAG ceramics.

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Thermal decomposition of the hydrated basic carbonates of lanthanides and yttrium

Cited by 83 publications

References 6 publications

Synthesis, thermal behavior, and spectroscopic study of the solid nalidixate of selected light trivalent lanthanides

Synthesis, thermal behavior, and spectroscopic study of the solid nalidixate of selected light trivalent lanthanides

Meet the Cerium(IV) Phosphate Sisters: Ce^IV(OH)PO₄ and Ce^IV₂O(PO₄)₂

Silica reactivity during reaction‐sintering of Nd:YAG transparent ceramics

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Thermal decomposition of the hydrated basic carbonates of lanthanides and yttrium

Cited by 83 publications

References 6 publications

Synthesis, thermal behavior, and spectroscopic study of the solid nalidixate of selected light trivalent lanthanides

Synthesis, thermal behavior, and spectroscopic study of the solid nalidixate of selected light trivalent lanthanides

Meet the Cerium(IV) Phosphate Sisters: CeIV(OH)PO4 and CeIV2O(PO4)2

Silica reactivity during reaction‐sintering of Nd:YAG transparent ceramics

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Meet the Cerium(IV) Phosphate Sisters: Ce^IV(OH)PO₄ and Ce^IV₂O(PO₄)₂