Non-stoichiometry-induced cracking in PbMoO4 crystals

Sangeeta, .; Desai, D. G.; Singh, Amit Kumar; Tyagi, Mohit; Sabharwal, S.C.

doi:10.1016/j.jcrysgro.2006.08.019

Cited by 21 publications

(33 citation statements)

References 12 publications

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“…The problems of crystal cracking and stoichiometric deviations have been perceived to be the two independent phenomena. Recently, non-stoichiometry was found to be the prime cause of cracking in PbMoO 4 crystals [6]. Following this work, the cracking in Czochralski-grown CdWO 4 (CWO), PbWO 4 (PWO) and ZnWO 4 (ZWO) oxide crystals which possess anisotropic physical properties and contain a common group WO 4 has been investigated.…”

Section: Introductionmentioning

confidence: 98%

Role of non-stoichiometry in the cracking of oxide crystals

Sangeeta¹,

Sabharwal²

2008

Journal of Crystal Growth

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Section: Introductionmentioning

confidence: 98%

Role of non-stoichiometry in the cracking of oxide crystals

Sangeeta¹,

Sabharwal²

2008

Journal of Crystal Growth

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“…Here, the non-stoichiometry is promoted in the oxygen sub-lattice, which necessitates stabilization of some of the Mo ions in lower valence state. This model is supported by the X-ray photoelectron spectroscopy (XPS) results of Sangeeta et al (2006), which shows the presence of both Mo +5 and Mo +6 ions in LMO-2 crystals.…”

Section: Resultsmentioning

confidence: 69%

“…The samples for X-ray absorption spectroscopy were prepared from single crystal pieces of PbMoO 4 (LMO) *Author for correspondence (sudhirsabharwal@yahoo.co.in) grown by Czochralski technique Sangeeta et al 2006). The three samples prepared for the present investigation were (a) grown from a stoichiometric charge in air, (b) from a stoichiometric charge in argon and (c) grown in air from a starting charge containing 1% excess PbO.…”

Section: Methodsmentioning

confidence: 99%

“…A major problem faced with the growth of LMO crystals is the occurrence of non-stoichiometry, which arises due to the excessive vapour pressure of MoO 3 over PbO at elevated temperatures. The preferential and uncontrolled depletion of MoO 3 during growth gives rise to colouration and cracking of the as-grown crystals (Zeng 1996;Bochkova et al 2003;Sabharwal et al 2006;Sangeeta et al 2006;Tyagi et al 2008). The presence of defects arising as a consequence of the stoichiometric deviations is also found to influence the crystal ionic conductivity (Neiman et al 1984).…”

Section: Introductionmentioning

confidence: 99%

“…It is observed Sangeeta et al 2006) that crack-free and transparent crystals can be obtained by performing the growth in air from a slightly Mo-excess starting charge. Optical transmission study shows that the highest optical transmission is achieved with such crystals.…”

Section: Introductionmentioning

confidence: 99%

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X-ray absorption spectroscopy of PbMoO4 single crystals

et al. 2009

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X-ray absorption spectra of PbMoO 4 (LMO) crystals have been investigated for the first time in literature. The measurements have been carried out at Mo absorption edge at the dispersive EXAFS beamline (BL-8) of INDUS-2 Synchrotron facility at Indore, India. The optics of the beamline was set to obtain a band of 2000 eV at 20,000 eV and the channels of the CCD detector were calibrated by recording the absorption edges of standard Mo and Nb foils in the same setting. The absorption spectra have been measured for three LMO samples prepared under different conditions viz. (i) grown in air from stoichiometric starting charge, (ii) grown in argon from stoichiometric starting charge and (iii) grown in air from PbO-rich starting charge. The results have been explained on the basis of the defect structure analysed in LMO crystals prepared under different conditions. The Mo absorption edge is significantly influenced by the deviations in crystal stoichiometry.

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Effect of foreign phases on the growth of NaBi(WO₄)₂ crystals

Singh

Tyagi

Singh

et al. 2009

Cryst. Res. Technol.

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Single crystals of NaBi(WO 4 ) 2 (NBW) have been grown by Czochralski technique, employing differently synthesized starting charge and different axial temperature gradients. The causes behind inherent problems related to compositional changes and associated lowering in crystallization temperature have been probed by analyzing XRD and DTA patterns of post growth residual charge. Presence of low melting phases viz. Na 2 WO 4 and hitherto unreported compound Na 5 Bi(WO 4 ) 4 is thought to be responsible for the observed decrease in crystallization temperature. This problem was tackled by segregating pure phase material through re-crystallization, under high axial temperature gradient. The use of re-crystallized charge enabled transformation of almost the entire charge into a single crystal of high transparency. The effect of starting charge synthesis and temperature gradient on the optical transmission characteristics of NBW crystal has also been investigated.

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Non-stoichiometry-induced cracking in PbMoO4 crystals

Cited by 21 publications

References 12 publications

Role of non-stoichiometry in the cracking of oxide crystals

Role of non-stoichiometry in the cracking of oxide crystals

X-ray absorption spectroscopy of PbMoO4 single crystals

Effect of foreign phases on the growth of NaBi(WO₄)₂ crystals

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Non-stoichiometry-induced cracking in PbMoO4 crystals

Cited by 21 publications

References 12 publications

Role of non-stoichiometry in the cracking of oxide crystals

Role of non-stoichiometry in the cracking of oxide crystals

X-ray absorption spectroscopy of PbMoO4 single crystals

Effect of foreign phases on the growth of NaBi(WO4)2 crystals

Contact Info

Product

Resources

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Effect of foreign phases on the growth of NaBi(WO₄)₂ crystals