SrSnO3:Nd obtained by the polymeric precursor method

Souza, Soraia Carvalho de; Alves, Mary Cristina Ferreira; Oliveira, André Luiz Menezes de; Longo, Elson; Vieira, F. T. G.; Gomes, Rodinei Medeiros; Soledade, L. E. B.; Souza, A. G.; Santos, I. M. G.

doi:10.1007/s10973-009-0239-5

Cited by 12 publications

(8 citation statements)

References 17 publications

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“…6,84 The thermal degradation of polyamides in the absence of oxygen is believed to involve the direct cleavage of the C-N bond along with the breakdown of other bonds. 85 The temperature at which maximum weight loss occurs (T s ) for these polyamides was observed between 400 and 500 • C. These values are slightly lower than the T s values reported for the fully aromatic polyamides 15,86 reflecting the presence of weak aliphatic methylene spacers together with flexible ether linkages in the polymer backbone. The aliphatic C-H bond has a lower dissociation energy compared with the aromatic C-H bond and hence polymers having aliphatic units in the main chain usually do not show high thermal stability.…”

Section: Thermal Propertiesmentioning

confidence: 82%

Study on the preparation and properties of novel block copolymeric materials based on structurally modified organometallic as well as organic polyamides and polydimethylsiloxane

Khan

Akhter

Naz

et al. 2012

Polymer International

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Some novel ferrocene‐containing polyamide‐based block copolymer materials with telechelic polydimethylsiloxane oligomer and their organic analogues were prepared by solution‐phase polycondensation of ferrocene‐based organometallic and terephthaloyl‐ as well as isophthaloyl‐based organic acyl chlorides with a series of semi‐aromatic diamines having ether linkages together with variable aliphatic character. The corresponding polyamides of the synthesized materials, without polydimethylsiloxane segment, were also prepared for comparison of physicochemical properties. None of the synthesized organometallic and organic block copolymers along with their respective polyamides melted below 300 °C and their structural features were confirmed by their physical properties and spectroscopic studies. The weight‐average molecular weights and molecular parameters of all these materials were determined by the static laser light scattering technique. The materials were soluble in sulfuric acid and partially soluble in common organic solvents, and yet became readily soluble upon N‐trifluoroacetylation. The synthesized materials were further characterized by their water absorption characteristics, X‐ray diffraction studies and surface morphology (SEM and AFM) and thermal (DSC and TG) analyses, and their structure–property relationships were elucidated from these studies. The energies of pyrolysis for these materials were calculated by the Horowitz and Metzger method. © 2012 Society of Chemical Industry

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Section: Thermal Propertiesmentioning

confidence: 82%

Study on the preparation and properties of novel block copolymeric materials based on structurally modified organometallic as well as organic polyamides and polydimethylsiloxane

Khan

Akhter

Naz

et al. 2012

Polymer International

View full text Add to dashboard Cite

show abstract

“…5). The appearance of SnO 2 and carbonates impurities in the materials was already observed in many doped and undoped alcalino earth stannates [41,42,22]. Strontium carbonate is difficult to remove completely in wet chemical method, and the remaining quantity should decomposing above 1073 K as mentioned in literature [43].…”

Section: Structure Refinements and Oxygen Stoichiometry Analysismentioning

confidence: 84%

“…Besides the tinoxygen bands, vibrations assigned to carbonates are also observed at 827 cm À 1 , 1382 cm À 1 and 1448 cm À 1 . According to the literature [22,16,50], the intensity of the main bands of SrCO 3 increases with increasing Er content.…”

Section: Ir Spectroscopymentioning

confidence: 84%

“…An important implication of this result that is the limit of Er solubility in SrSnO 3 is approximately at 3 mol %. Thus, the wider range of biphasicity and lesser solubility, observed in Sr 1 À x Er x SnO 3 À d series as compared to the ''Ln'' doped SrSnO 3 [22,23] can be attributed to larger difference in ionic sizes of Sr 2 þ and Er 3 þ as compared to that between Sr 2 þ and Ln 3 þ which affects their miscibility behaviour.…”

Section: Structure Refinements and Oxygen Stoichiometry Analysismentioning

confidence: 98%

“…Stannate compounds doped by rare earth elements have been widely investigated and reported as photoluminescence materials, especially systems CaSnO 3 :Eu 3þ [18], CaSnO 3 :Tb 3 þ [19,20], SrSnO 3 : Eu 3þ [21], SrSnO 3 :Nd [1,22], SrPbO 3 :La [23], BaSnO 3 :La [24]. In these systems Ln 3þ ions are expected to occupy A 2þ sites into the compounds ASnO 3 .…”

Section: Introductionmentioning

confidence: 99%

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