Growth and Ionic Conductivity of Li_{3 + x}P_{1 x}Ge_xO₄ (x = 0.34)
Single Crystals

A. K. Ivanov-Shitz and V. V. Kireev

Shubnikov Institute of Crystallography, Russian Academy of Sciences,
Leninski pr. 59, Moscow, 119333 Russia

e-mail: ivanov@ns.crys.ras.ru

Received February 6, 2002

Abstract—Li_3+xP_1xGe_xO₄ crystals (x = 0.34) with dimensions of about 3 3 5 mm³ were grown for the
first time from flux. The conductivities of the crystals measured along three directions have close values and are
equal to 1.8 10^–6 and 3.7 10^–2 Sm/cm at the temperatures 40 and 400°C, respectively (similar to the case
of pure lithium phosphate, somewhat lower values of electric conductivity were measure along the b axis). The
activation energy of conductivity is equal to 0.54 eV. A considerable increase in the conductivity of the solid
solution in comparison with the conductivity of pure lithium phosphate is explained by the specific features of
the lithium sublattice in the crystal structure of the -Li₃PO₄ type. © 2003 MAIK “Nauka/Interperiodica”.

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