8-K

                            UNITED STATES
                  SECURITIES AND EXCHANGE COMMISSION
                         WASHINGTON, DC 20549


                               FORM 8-K


                        CURRENT REPORT PURSUANT
                     TO SECTION 13 OR 15(D) OF THE
                    SECURITIES EXCHANGE ACT OF 1934


Date of report (Date of earliest event reported)   April 4, 2005
                                                   -------------

                           II-VI Incorporated
                           ------------------
         (Exact Name of Registrant as Specified in Its Charter)

                             Pennsylvania
                             ------------
            (State or Other Jurisdiction of Incorporation)

           0-16195                          25-1214948
           -------                          ----------
 (Commission File Number)        (IRS Employer Identification No.)


375 Saxonburg Boulevard, Saxonburg, Pennsylvania         16056
- ---------------------------------------------------------------
(Address of Principal Executive Offices)              (Zip Code)

                            (724) 352-4455
                            --------------
         (Registrant's Telephone Number, Including Area Code)

                            Not Applicable
                            --------------
     (Former Name or Former Address, if Changed Since Last Report)

     Check the appropriate box below if the Form 8-K filing is
intended to simultaneously satisfy the filing obligation of the
registrant under any of the following provisions (see General
Instruction A.2. below):

      [  ]  Written communications pursuant to Rule 425 under the
Securities Act (17 CFR 230.425)

      [  ]  Soliciting material pursuant to Rule 14a-12 under the
Exchange Act (17 CFR 240.14a-12)

      [  ]  Pre-commencement communications pursuant to Rule 14d-2(b)
under the Exchange Act (17 CFR 240.14d-2(b))

      [  ]  Pre-commencement communications pursuant to Rule 13e-4(c)
under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01.  Other Events.
            ------------

On April 4, 2005, II-VI Incorporated (the "Company") issued a press
release entitled, "II-VI Incorporated, SemiSouth Laboratories, Inc. and
Mississippi State University Partner in the Development of Silicon
Carbide."  The full text of the Company's press release is filed as
Exhibit 99.1 to this Current Report on Form 8-K and is incorporated
herein by reference.

Item 9.01.  Financial Statements and Exhibits.
            ---------------------------------

    (c)     Exhibits.  The following exhibit is being filed pursuant to
                       Item 601 of Regulation S-K:

              99.1     Press Release





                              SIGNATURES

      Pursuant to the requirements of the Securities Exchange Act of
1934, the registrant has duly caused this report to be signed on its
behalf by the undersigned thereunto duly authorized.

                                    II-VI INCORPORATED
                                    (Registrant)

Date:  April 5, 2005             By:     /s/ Carl J. Johnson
                                               Chairman and
                                         Chief Executive Officer



Date:  April 5, 2005             By:    /s/ Craig A. Creaturo
                                          Chief Financial Officer
                                               and Treasurer





                              EXHIBIT INDEX


      Exhibit No.               Description
      -----------               -----------

      99.1  Press Release       II-VI Incorporated, SemiSouth
                                Laboratories, Inc. and Mississippi
                                State University Partner in the
                                Development of Silicon Carbide

EX-99

Release Date:  April 4, 2005        Contact:  Craig A. Creaturo
                                              Chief Financial
                                              Officer and Treasurer
                                              (724) 352-4455
                                              ccreaturo@ii-vi.com
                                              Homepage:  www.ii-vi.com





               II-VI INCORPORATED, SEMISOUTH LABORATORIES, INC.
               AND MISSISSIPPI STATE UNIVERSITY PARTNER IN THE
                       DEVELOPMENT OF SILICON CARBIDE

PITTSBURGH, PA., April 4, 2005  -- II-VI Incorporated (NASDAQ NMS: IIVI)
announced today that it is partnering with SemiSouth Laboratories, Inc.
and Mississippi State University for the establishment of a Silicon
Carbide (SiC) semiconductor substrate manufacturing facility in
Starkville, Mississippi.  This effort will focus on II-VI's production
capabilities in SiC substrates along with an advanced SiC epitaxial
material growth technology at SemiSouth.  During this process, strong
technical and operational support will be provided from II-VI's New
Jersey-based Wide Bandgap Materials Group Technical Center and
Headquarters where II-VI will strengthen its research and worldwide
marketing.

Earlier today, Carl J. Johnson, chairman and chief executive officer of
II-VI Incorporated noted the following during a visit to Mississippi.
"Our technology and manufacturing development teams in New Jersey and
Pennsylvania have made considerable advancements in the growth of single
crystal SiC materials.  Anticipating continued success and market growth,
we are now entering a new phase of our business as we prepare for the
scale-up to high volume production.  II-VI is looking forward to
partnering with Mississippi State University and SemiSouth in this highly
productive initiative."

II-VI Incorporated also announced that it made an investment in
SemiSouth. Terms of the transaction were not disclosed.

Headquartered in Saxonburg, Pennsylvania, II-VI Incorporated designs,
manufactures and markets optical and opto-electronic components, devices
and materials for infrared, near-infrared, visible light, x-ray and gamma
ray instrumentation.  The Company's infrared optics business manufactures
optical and opto-electronic components sold under the II-VI brand name
and used primarily in CO2 lasers.  The Company's near-infrared optics
business manufactures near-infrared and visible light products for
industrial, scientific, military and medical instruments and laser gain
materials and products for solid-state YAG and YLF lasers at the
Company's VLOC subsidiary.  The Company's military infrared optics
business manufactures infrared products for military applications under
the Exotic Electro-Optics (EEO) brand name.  In the Company's Compound
Semiconductor Group, the eV PRODUCTS division manufactures and markets
solid-state x-ray and gamma-ray sensor products and materials for use in
medical, industrial, environmental, scientific and homeland security
applications; the Company's Wide Bandgap Materials (WBG) group
manufactures and markets single crystal silicon carbide substrates for
use in the solid-state lighting, wireless infrastructure, RF electronics
and power switching industries; Marlow Industries, Inc. designs and
manufacturers thermoelectric cooling and power generation solutions for
use in defense, space, photonics, telecommunications, medical, consumer
and industrial markets.

This press release contains forward-looking statements based on certain
assumptions and contingencies that involve risks and uncertainties.  The
forward-looking statements are made pursuant to the safe harbor
provisions of the Private Securities Litigation Reform Act of 1995 and
relate to the Company's performance on a going-forward basis.  The
forward-looking statements in this press release involve risks and
uncertainties, which could cause actual results, performance or trends,
including the above mentioned anticipated revenues and earnings, to
differ materially from those expressed in the forward-looking statements
herein or in previous disclosures.  The Company believes that all
forward-looking statements made by it have a reasonable basis, but there
can be no assurance that management's expectations, beliefs or
projections as expressed in the forward-looking statements will actually
occur or prove to be correct.  In addition to general industry and
economic conditions, factors that could cause actual results to differ
materially from those discussed in the forward-looking statements in this
press release include, but are not limited to: (i) the Company's ability
to successfully integrate Marlow's operations into the Company's
organization and to realize synergies in material growth and utilization
of our worldwide manufacturing and distribution networks (ii) the failure
of any one or more of the assumptions stated above to prove to be
correct; (iii) the risks relating to forward-looking statements and other
"Risk Factors" discussed in the Company's Annual Report on Form 10-K for
the fiscal year ended June 30, 2004; (iv) purchasing patterns from
customers and end-users; (v) timely release of new products, and
acceptance of such new products by the market; (vi) the introduction of
new products by competitors and other competitive responses; and/or (vii)
the Company's ability to devise and execute strategies to respond to
market conditions.

CONTACT:  Craig A. Creaturo, Chief Financial Officer and Treasurer of II-
VI Incorporated, 724-352-4455, or e-mail, ccreaturo@ii-vi.com.

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