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Volumn 70, Issue 24, 2004, Pages 1-9

Electronic structure of KD2xH2(1-x)PO4 studied by soft x-ray absorption and emission spectroscopies

Author keywords

[No Author keywords available]

Indexed keywords

OXYGEN; PHOSPHORUS; POTASSIUM;

EID: 20144371963     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.70.245106     Document Type: Article
Times cited : (28)

References (65)
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    • See, for example, recent reviews by N. Zaitseva and L. Carman, Prog. Cryst. Growth Charact. 43, 1 (2001); J. J. De Yoreo, A. K. Burnham, and P. K. Whitman, Int. Mater. Rev. 47, 113 (2002), and references therein.
    • (2001) Prog. Cryst. Growth Charact. , vol.43 , pp. 1
    • Zaitseva, N.1    Carman, L.2
  • 3
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    • and references therein
    • See, for example, recent reviews by N. Zaitseva and L. Carman, Prog. Cryst. Growth Charact. 43, 1 (2001); J. J. De Yoreo, A. K. Burnham, and P. K. Whitman, Int. Mater. Rev. 47, 113 (2002), and references therein.
    • (2002) Int. Mater. Rev. , vol.47 , pp. 113
    • De Yoreo, J.J.1    Burnham, A.K.2    Whitman, P.K.3
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    • W. R. Cook, Jr., J. Appl. Phys. 38, 163 (1967); C. Belouet, M. Monnier, and R. Crouzier, J. Cryst. Growth 30, 151 (1975).
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    • 0000098947 scopus 로고    scopus 로고
    • and references therein
    • K.-S. Lee, J. Phys. Chem. Solids 57, 333 (1996), and references therein.
    • (1996) J. Phys. Chem. Solids , vol.57 , pp. 333
    • Lee, K.-S.1
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    • note
    • 2O polishing.
  • 36
    • 85088490120 scopus 로고    scopus 로고
    • note
    • 2,3-edge (∼300 eV) rather than for O K-edge (∼540 eV) XANES spectra can be attributed to (i) smaller energies of ejected photoelectrons and (ii) a larger photoelectron cross section for the case of excitation with lower energy photons.
  • 39
    • 14944359851 scopus 로고    scopus 로고
    • note
    • It should be noted that XANES has a relatively poor sensitivity to defect-induced electronic states as compared to some other analytical techniques. Indeed, while techniques such as photoluminescence and cathodoluminescence and electrical characterization are sensitive to concentrations of (optically or electrically) active defects comparable to the concentration of free carriers, XANES is sensitive to concentrations of defect-related densities of states (in the volume probed) comparable to the atomic concentration in the material (i. e., when the density of defect-related electronic states is roughly comparable to the density of states in the conduction band). However, a quantitative evaluation of XANES sensitivity to defect-related states is not straightforward and is beyond the scope of this work.
  • 41
    • 14944350703 scopus 로고    scopus 로고
    • note
    • We have observed relatively strong C-related absorption peaks in TFY spectra in all the KDP and DKDP samples studied in this work after different surface preparation conditions (such as water polishing on different lens paper, etching in water-ethanol solutions, and sample cleavage [in air]). Our detailed study of C impurities, unintentionally introduced into KDP and DKDP during crystal growth, with possible implications to the performance of KDP and DKDP as optical materials, will be reported separately.
  • 44
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    • See, for example, Z. Y. Wu, F. Jollet, and F. Seifert, J. Phys.: Condens. Matter 10, 8083 (1998); L. A. G. Garvie, P. Rez, J. R. Alvarez, P. R. Buseck, A. J. Craven, and R. Brydson, Am. Mineral. 85, 732 (2000), and references therein.
    • (1998) J. Phys.: Condens. Matter , vol.10 , pp. 8083
    • Wu, Z.Y.1    Jollet, F.2    Seifert, F.3
  • 56
    • 85088488169 scopus 로고    scopus 로고
    • note
    • 2.3 XES spectra for excitation photon energies above 536 and 139 eV, respectively.
  • 59
    • 14944377371 scopus 로고    scopus 로고
    • note
    • The room-temperature band gap value of 8.4 eV, quoted in Ref. 54, was taken from a paper by Ogorodnikov et al. (Ref. 21), where the estimation of the band gap was given for 7 K (not for 300 K). Hence, we consider the room-temperature band gap value (of 8.4 eV) quoted by Carr et al. (Ref. 54) as a misquotation.
  • 64
    • 85088492017 scopus 로고    scopus 로고
    • note
    • 2,3 edges, respectively). For such excitation energies, XES spectra exhibit smaller high energy tails, facilitating estimation of the valence band maximum.
  • 65
    • 14944349224 scopus 로고    scopus 로고
    • note
    • Note that, due to element and angular momentum selectivity of XANES and XES, such an estimate can also give a higher value than the optical band gap in cases when the states probed by XANES and XES do not contribute to the band edges.


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