A novel method for prevention of the oxidation of Sb(III) during sample pretreatment, preconcentration of Sb(III) and Sb(V) with nanometer size titanium dioxide (rutile) and speciation analysis of antimony, has been developed. Antimony(III) could be selectively determined by flow injection-hydride generation-atomic absorption spectrometry, coexisting with Sb(V). Trace Sb(III) and Sb(V) were all...

Skutterudites based on CoSb3 have high thermoelectric efficiency, but the low fracture strength is a serious consideration for commercial applications. To understand the origin of the brittleness in CoSb3, we examine the response along various shear and tensile deformations using density functional theory. We find that the Co−Sb bond dominates the ideal strength. Among all the shear and tensile...

The IR and Raman spectra of the compounds (CH,),Sb-Sb(CH,), (I), [(CH,),Si],SbSb[Si(CH,),], (II), [(CH,),Si],As-As[Si(CH,),], (III) and (C,H,),Sb--Sb(C,H,), (IV) have been studied in the liauid and solid states. Given assianments for I to III are based on normal coordinate analyses, and force constants are reported. The solid state Raman spectra of I and II exhibit strong lines near 50 cm-‘, wh...

Orpiment, getchellite and stibnite from Zarshuran deposit, NW Iran, exhibit extensive As-Sb substitution. There are four known minerals along As2S3-Sb2S3 join, i.e. orpiment (As2S3), Wakabayashilite [(As,Sb)20S30], getchellite (AsSbS3) and stibnite (Sb2S3). Extensive mineralogical studies by scanning electron microscope (SEM) and electron probe micro-analyzer (EPMA) indicate that getchellite fr...

This Study seeks to scrutinize whether surplus free cash flow is correlated with earnings management, if auditor size moderates this relationship. To do so, modified Jones discretionary accrual model (1995) and audit firm size are used as audit quality indicator to measure earnings management. The research hypotheses are built upon a sample of 103 companies listed on the Tehran Stock Exchange d...