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The growth of needles and single crystals of ammonium bydrogen tartra-te,AHT,(NH_4HC_4H_4O_6)in silica gels under the influence of an externallyapplied uniform electric field is described.A controlled reaction between tar-taric acid and ammonium chloride by a slow diffusion process in the gel me-
The growth of needles and single crystals of ammonium bydrogen tartra-te, AHT, (NH 4 HC 4 H 4 O 6) in silica gels under the influence of an externally applied uniform electric field is described. A controlled reaction between tar-taric acid and ammonium chloride by a slow diffusion process in the gel me-