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Single crystals of yttrium aluminium garnet doped with zirconium ions (Y,AI,O,,: Zr, YAG: Zr) are grown from the melt and their optical and ESR absorption spectraare investigated. It is established that the color centers and paramagnetic centers have an identical nature being caused by Zr3f ions in dodechahedrical sites of the garnet lattice. The experimental results are interpreted in the approximation of crystal field and molecular orbital theories.BbIpaQeHbI E13 PaCIIJIaBa MOHOKpIICTaJIJIbI IITTpII&aJIIoMIIHIIeBOrO rpaHaTa, aHTE1BtlpOBaH-HbIe IlUpKOHIIeM (Y,A1,Ol2: Zr, HAr: Zr) II HCCJIeAOBaHbI IIX CIIertTpbI OIITII4eCECOI' O ITOJII'O-~eIIUFI II 3nP. YCTaHOBJIeHO, YTO UeHTPbI OKpaCKII E1 IIapaMaI'HItTHbIe UeHTPbI EIMeIoT MHeHTIIrIHYH) IIpIIpOAy E1 06yCJIOBJIeHbI HOHaMH wf, HaXOL(HK(IIMIIC5i B AOL(eHa3ApE1-geCKIlX y3JIaX PeILIeTHII HAr. 3KCIIepMMeHTaJIbHbIe pe3yJIbTaTbI E1HTepIIpeTHpOBaHbI B I I~H~J I~X K~H H E~ TeOpHfi Kp~cTaJI~E1YeCKOrO IIOJIII E1 MOJIeKYJIHpHbIX op6~1~aneii.

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