Reversible Mn segregation at the polar surface of lithium tetraborate | Zendy

Christina Dugan | Zendy; R. L. Hengehold | Zendy; Steve R. McHale | Zendy; Juan A. Santana | Zendy; John W. McClory | Zendy; V.T. Adamiv | Zendy; Ya.V. Burak | Zendy; Ya. B. Losovyj | Zendy; P. A. Dowben | Zendy

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Reversible Mn segregation at the polar surface of lithium tetraborate

Author(s) -

Christina Dugan,

R. L. Hengehold,

Steve R. McHale,

Juan A. Santana,

John W. McClory,

V.T. Adamiv,

Ya.V. Burak,

Ya. B. Losovyj,

P. A. Dowben

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4802760

Subject(s) - materials science , lithium (medication) , dissolution , ionic bonding , polar , pyroelectricity , surface (topology) , condensed matter physics , analytical chemistry (journal) , ion , chemistry , ferroelectricity , optoelectronics , physics , geometry , organic chemistry , mathematics , chromatography , astronomy , dielectric , endocrinology , medicine

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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