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We find Mn surface segregation for single crystals of Mn doped Li2B4O7, nominally Li1.95Mn0.05B4O7(001), but as the temperature increases, evidence of this Mn surface segregation diminishes significantly. At room temperature, the surface photovoltaic charging is significant for this pyroelectric material but is quenched at a temperature well below that seen for the undoped Li2B4O7 samples. The suppression of surface charging in the region of 120 °C that accompanies the temperature of Mn dissolution in the bulk of Li2B4O7, i.e., the reversal of Mn surface segregation (215 °C), suggests that along the (001) direction, ionic transport must be considered as significant.
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© 2013 AIP Publishing LLC, published under an exclusive license with American Institute of Physics.

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This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Applied Physics Letters, 102: 161602 as fully cited below and may be found at DOI: 10.1063/1.4802760.

Funding notes: This work was supported by the Defense Threat Reduction Agency (Grant Nos. HDTRA1-07-1-0008 and BRBAA08-I-2-0128), the NSF through the “QSPINS” MRSEC (DMR-0820521) at UNL, and STCU Project 4947.



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Applied Physics Letters