EXHIBIT 32.2

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


         In connection with the Annual Report of AXT, Inc. (the "Company") on
Form 10-K for the year ended December 31, 2003 as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), I, Donald L. Tatzin,
Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section
1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
("Section 906"), that, to the best of my knowledge:

         (1) The Report fully complies with the requirements of section 13(a) of
the Securities Exchange Act of 1934 (15 U.S.C. 78m); and

         (2) The information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations of the
Company.


March 29, 2004
                                        /s/ Donald L. Tatzin
                                        -----------------------
                                        Donald L. Tatzin
                                        Chief Financial Officer

A signed original of this written statement required by Section 906, or other
document authenticating, acknowledging, or otherwise adopting the signature that
appears in typed form within the electronic version of this written statement
required by Section 906, has been provided to AXT,Inc. and will be retained by
AXT, Inc. and furnished to the Securities and Exchange Commission or its staff
upon request.