  A calculation of the expected signal due to Primakov coherent conversion of
solar axions into photons via Bragg scattering in several solid-state detectors
is presented and compared with present and future experimental sensitivities.
The axion window m_a > 0.03 eV (not accessible at present by other techniques)
could be explored in the foreseeable future with crystal detectors to constrain
the axion-photon coupling constant below the latest bounds coming from
helioseismology. On the contrary a positive signal in the sensitivity region of
such devices would imply revisiting other more stringent astrophysical limits
derived for the same range of the axion mass. The application of this technique
to the COSME germanium detector which is taking data at the Canfranc
Underground Laboratory leads to a 95% C.L. limit g_a < 2.8 10^-9 GeV^-1.
