A strict dynamical theory of radiation scattering in defect crystals is developed involving no arbitrary assumptions. Final theoretical expressions are obtained for the case of Laue‐diffraction in monocrystals containing homogeneously distributed defects, in particular Coulomb‐like defects (clusters, dislocation loops). The theory gives an unified description of the thickness dependences of intensity scattering both, for thin and thick crystals, and predicts an effect of anomalous transmission of diffuse background in thick crystals. Experimental investigations on O‐ or Cu‐doped Si‐monocrystals are carried out which confirms the theory.

The theory of the dynamical X-ray diffuse scattering (DS) in single crystals with homogeneously distributed microdefects (point defect clusters, inclusions, new phase nuclei, dislocation loops, etc.) is developed. The thickness dependence of the DS intensity distribution in reciprocal lattice space is investigated by constructing both, iso-intensity contours and plane projections of threedimensional images. Possibilities to obtain a detailed information concerning various-kind microdefects characteristics by using distribution patterns of the DS intensity are discussed.

C, alloys as heat capacity and electric resistivity in the temperature range 1.5 to 300 K, magnetoresistance in perpendicular and parallel magnetic fields up to = 4.78 X 10' A/m, magnetization, and the Mossbauer effect at 100 and 300 K are investigated. The data obtained are interpreted in t e r m of the hypothesis of short-range order and weakly-coupled "paramagnetic" centres in a ferromagnetic matrix. A phenomenological description of magnetoresistance data is given and a correlation with the Mossbauer data is discussed. npOBeAeH0 HCCJleAOBaHHe TenJIOeMHOCTH EI 3JIeKTpOCOIlpOTElBJIeHHfl aMOP@HbIX CIlJlaBOB FemB,, H Fe,,P,,C, B HHTepBaJIe TeMnepaTyp 1,s a0 300 K , MarHeTOCOIIpOTHBJIeHUfl B nepneHnnHynspHMx H napannenmmx nonfix AO w 4,78 x 1 0 ' A/m, naMarHmeHHocTn H a @ @ e~~a Mecc6ayapa npu TeMnepaTypax 100 u 300 K. nonyremble aamme umepnpe-TEl PYIOTCR Ha OCHOBe rHlTOTe3bI KOMl l OaWl IHOHHOTO 6 n~m~e r o IIOpflHKa EI cna6o CBR3aHHblX ,,llaPaMaI' HEITHbIX" UeHTpOB B @ePPOMal' HHTHOfi MaTpHUe. &aHO @eHOMeHOJIOrH9eCHOe OnH-CaHHe pe3yJIbTaTOB H3MepeHEIR MarHeTOCOl' lpOTHBneHHR H 06cy~c~ae~cfl HOppeJIflUHfl C MeCC6aY3pOBCKEIMH ,TJPHH€dMH.

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